CROSS-REFERENCE TO RELATED PATENT APPLICATIONS This patent application is a continuation of patent application Ser. No. 10/731,224, which claims the benefit of U.S. Provisional Patent Application No. 60/432,317 filed December 9, 2002, U.S. Provisional Patent Application 60/526,544 filed Dec. 3, 2003, U.S. Provisional Patent Application 60/526,773 filed Dec. 4, 2003, and U.S. Provisional Patent Application 60/527,177 filed Dec. 5, 2003.
This invention pertains to pharmaceutical compositions comprising pharmaceutically active agents for parenteral or other internal use, which have the effect of reducing certain undesirable side effects upon administration when compared with available formulations of similar drugs.
It is well recognized that many drugs for parenteral use, especially those administered intravenously, cause undesirable side effects such as venous irritation, phlebitis, burning and pain on injection, venous thrombosis, extravasation, and other administration related side effects. Many of these drugs are insoluble in water, and are thus fomulated with solubilizing agents, surfactants, solvents, and/or emulsifiers that are irritating, allergenic, or toxic when administered to patients (see, e.g., Briggs et al.,Anesthesis37, 1099 (1982), and Waugh et al.,Am. J. Hosp. Pharmacists,48, 1520 (1991)). Often, the free drug present in the formulation induces pain or irritation upon administration. For example, phlebitis was observed in 50% of patients who received peripheral vein administration of ifosfamide and vinorelbine as first-line chemotherapy for advanced non-small cell lung carcinoma. (see, e.g., Vallejo et al.,Am. J. Clin OncoL,19(6), 584-8 (1996)). Moreover, vancomycin has been shown to induce side effects such as phlebitis (see, e.g., Lopes Rocha et al.,Braz. J Infect. Dis.,6(4), 196-200 (2002)). The use of cisplatin, gemcitabine, and SU5416 in patients with solid tumors has resulted in adverse events such as deep venous thromboses and phlebitis (see, e.g., Kuenen et al.,J Clin. Oncol.,20(6), 1657-67 (2002)). In addition, propofol, an anesthetic agent, can induce pain on injection, burning and vein irritation, particularly when administered as a lecthin-stabilized fat emulsion (see, e.g, Tan et al.,Anathesia,53, 468-76, (1998)). Other drugs that exhibit administration-associated side effects include, for example, Taxol (paclitaxel) (see, e.g., package insert for Taxol I.V.), codarone (amiodarone hydrochloride) (see, e.g., package insert for Codarone I.V.), the thyroid hormone T3 or liotiyronine (commercially available as Triostat), thiotepa, bleomycin, and diagnostic radiocontrast agents.
Another problem associated with the manufacture of drugs for injection, particularly water insoluble drugs, is the assurance of sterility. Sterile manufacturing of drug emulsions/dispersions can be accomplished by absolute sterilization of all the components before manufacture, followed by absolutely asetic technique in all stages of manufacture. However, such methods are time consuming and expensive. In addition, the oxidation of drug formulations by exposure to air during manufacture or storage can lead to, for example, reduced pH, drug degradation, and discoloration, thereby destabilizing the drug formulation and/or reducing shelf life.
To circumvent the problems associated with adminisration-related side effects of drug formulations, alternate formulations have been attemptec. With respect to propofol, for example, methods for reducing propofol-induced pain include increasing the fat content of the solvent (e.g., long chain triglycerides (LCT), premedication, pretreatment with non-steroidal drugs, local etics, opioids, the addition of lidocaine, the addition of cyclodextrin, and microfiltration (see, e.g., Mayer et al.,Anaesthesist,45(11), 1082-4 (1996), Davies, et al.Anaesthesia,57, 557-61 (2002), Doenicke, et al,Anaesth. Analg.,82, 472-4 (1996), Larsen et al.,Anaesthesitis50, 842-5 (2001), Lilley et al.,Anaesthesia,51, 815-8 (1996), Bielen et al.,Anesth Analg.,82(5), 920-4 (1996), and Knibbe et al.,Br. J Clit Pharmacol.,47(6), 653-60 (1999)). These formulations, however, induce other side effects (e.g., cardiovascular complications), or cause destabiliztion of propofol emulsions.
To overcome the problem of bacterial contamination, propofol formulations have been developed with antibacteial agents, such as an EDTA equivalent (e.g., edetate), pentetate, or sulfite-containing agents, or they have been have been formulated with a lower pH (see, e.g., U.S. Pat. Nos. 5,714,520, 5,731,355, 5,731,356, 6,028,108, 6,100,302, 6,147,122, 6,177,477, 6,399,087, 6,469,069, and Intenational Patent Application No. WO 99/39696). Since edetate and pentetate are metal ion chelators, however, they have the potential to be dangerous by scavenging the essential metal ions from the body system. Moreover, the addition of sulphites to drug formulations presents potential adverse effects to the periatric population and for those in the general population who are allergic to sulphur.
Thus, there remains a need for a composition and method that reduce or eliminate the side effects associated with the parenteral or in vivo administration of drugs. There also is a need for a pharmaceutical composition that is sterile, and methods of preparing such a composition. In addition, there is a need for a pharmaceutical composition and method that reduce or eliminate oxidation of pharmaceutical formulations to prevent drug destabilization.
The invention provides such compositions and methods. These and other advantages of the invention, as well as additional inventive features, will be apparent from the description of the invention provided herein.
The invention provides various embodiments of pharmaceutical compositions. One, some, or all of the properties of the various embodiments can be found in different embodiments of the invention and still fall within the scope of the appended claims.
The invention provides a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises a protein, such as albumin, more preferably human serum albumin, in an amount effective to reduce one or more side effects of administration of the pharmaceutical composition into a human, and wherein the pharmaceutically acceptable carrier comprises deferoxamine in an amount effective to inhibit microbial growth in the pharmaceutical composition. The invention also provides a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises a protein, such as albumin, in an amount effective to reduce one or more side effects of administation of the pharmaceutical composition into a human, and wherein the pharmaceutically acceptable carrier comprises deferoxamine in an amount effective to inhibit oxidation m the pharmaceutical composition.
The invention provides a method for reducing one or more side effects associated with administration of a pharmaceutical composition to a human comprising (a) administering to a human a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrer, wherein the pharmaceutically acceptable carrier comprises albumin and deteroxamine. Also provided are methods for inhibiting microbial growth or for inhibiting oxidation, or for inhibiting microbial growth and oxidation in a pharmaceutical composition. These methods comprise preparing a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmacutically acceptable carrier comprises deferoxamine in an amount effective for inhibiting microbial growth or an amount effective for inhibiting oxidation in the pharmaceutical composition.
The invention also provides a method for enhrncing transport of a pharmaceutical agent to the site of an infirmity, which method comprises administering to a human a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carier, wherein the pharmaceutically acceptable carrier comprises albumin, and wherein the ratio of albumin to pharmaceutical agent in the pharmaceutical composition is about 18:1 or less. The invention further provides a method for enhancing binding of a pharmaceutical agent to a cell in vitro or in vivo, which method comprises administering to said cell in vitro or in vivo a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises albumin, and wherein the ratio of albumin to pharmaceutical agent in the pharmaceutical composition is about 18:1 or less.
The invention also provides a pharmaceutical composition comprising a pharmaceutical agent and a phamaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises albumin in an amount effective to increase tansport of the drug to the site of infirmity in a human, and wherein the ratio of albumin to pharmaceutical agent is about 18:1 or less.
The invention further provides a method for increasing the transport of a pharmaceutical agent to a cell in vitro or in vivo by combining said agent with a protein, wherein said protein binds a specific cell-surface receptor on said cell, wherein said binding of the protein-pharmceutical agent combination with the said receptor causes the transport to occur, and wherein the ratio of protein to pharmaceutical agent is about 18:1 or less.
The invention provides a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carier comprises a protein such as albumin, preferably human serum albumin, in an amount effective to reduce one or more side effects of administration of the pharmaceutical composition to a human, and wherein the pharmaceutically acceptable carrer comprises deferoxamine in an amount effective to inhibit microbial growth in the pharmaceutical composition. The invention also provides a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, where the pharmaceutically acceptable carrier comprises a protein such as albumin in an amount effective to reduce one or more side effects of administration of the pharmaceutical composition to a human, and wherein the pharmaceutically acceptable carier comprises deferoxamine in an amount effective to inhibit oxidation in the pharmaceutical composition.
Any suiable pharmaceutical agent can be used in the inventive pharceutical composition. Suitable pharmaceutical agents include, but are not limted to, anticancer agents or antineoplastics, antimicrotubule agents, immunosuppressive agents, anesthetics, hormones, agents for use in cardiovascular disorders, antiarrythmics, antibiotics, antifungals, antihypertensives, antiasmatics, analgesics, anti-inflammatory agents, anti-arthriic agets, and vasoactive agents. The invention is useful with many other drug classes as well. More specifically, suitable pharmaceutical agents include, but are not limited to, taxanes, (e.g., Taxol® (paclitaxel), and Taxotere™ (docetaxel)), epotilones, camptothecin, colchicine, amiodarone, thyroid hormones, vasoactive peptides (e.g., vasoactive intestinal peptide), amphotericin, corticosteroids, propofol, melatonin, cyclosporine, rapamycin (sirolimus), tacrolimus, mycophenolic acids, ifosfamide, vinorelbine, vancomycin, gemcitabine, SU5416, thiotepa, bleomycin, diagnostic radiocontrast agents, and derivatives hereof. Other drugs that are useful in the inventive composition are described in, for example, U.S. Pat. No.5,916,596 and co-pending U.S. patent application No. 09/446,783. Preferably, the pharmaceutical agent is propofol, paclitaxel, or docetaxel. More preferably, the pharmaceutical agent is propofol or paclitaxel. Most preferably, the pharmaceutical agent is propofol.
Taxol® (paclitaxel) (Bristol-Myers Squibb) is active against carcinomas of the ovary, breast, lung, esophagus and head and neck. Taxol, however, has been shown to induce toxicities associated with administration, as well significant acute and cumulative toxicity, such as myelosuppression, neutropenic fever, anaphylactic reaction, and peripheral neuropathy. Because paclitaxel is poorly soluble in water, cremophor typically is used as a solvent, requiring large infusion volumes and special tubing and filters. Cremophor is associated with side effects that can be severe, including anaphylaxis and other hypersensitivity reactions that can require pretreatment with corticosteroids, antihistamines, and H2blockers (see, e.g., Gelderblom et al.,Eur. J of Cancer,37, 1590-1598, (2001)). Taxotere™ (docetaxel) is used in treatment of anthracycline-resistant breast cancer, but also has previously been shown to induce side effects of hypersntivity and fluid retention that can be severe. Epothilone (and derivatives thereof) also typically is admilnistered in cremophor, and has been shown to induce severe neutropenia, hypersensivity, and neuropathy.
Propofol (2,6-diisopropylphenol) is a hydrophobic, water-insoluble oil, which is widely used as an intravenous anesthetic agent to induce and maintain general anesthesia and sedation of humans and animals. Propofol typically is admistered directly into the bloodstream and crosses the blood-brain barrier. Pharmaceutical compositions comprising propofol must have sufficient lipid solubility to cross this barrier and depress the relevant mechanisms of the brain. Propofol has a maximum solubility in water of 1.0 +/−02 μM at 22.5° C. (see, e.g., Tonner et al.,Anesthesiology,77, 926-931 (1992)). As such, propofol is generally formulaed as an emulsion containing solubmzing agents, surfactants, solvents, or as an oil-in-water emulsion (see, e.g., U.S. Pat. Nos. 6,150,423, 6,326, 406, and 6,362,234). In addition to the active pharmaceutical agent, the compositions of the present invention include pharmaceutical carriers, or excipients. The choice of carrier is not necessarily critical, and any of the carriers known in the at can be used in the composition. The choice of carier is preferably determined, in part, by the particular site to which the pharmaceutical composition is to be administered and the particular method used to administer the pharmaceutical composition. Preferably, the pharmaceutically acceptable carrier comprises proteins. Any suitable protein can be used. Examples of suitable proteins include, but are not limited to albumn, inmunoglobulns including IgA, lipoproteins, apolipoprotein B, beta-2-macroglobulin, thyroglobulin and the like. Most preferably, the pharmaceutically acceptable carrier comprises albumin, most preferably human serum albumin. Proteins, including albumin, suitable for the invention may be natural in origin or synthetically prepared.
Human serum albumin (HSA) is a highly soluble globular protein of M, 65 K and consists of 585 amino acids. HSA is the most abundant protein in the plasma and accounts for 70-80% of the colloid osmotic pressure of human plasma. The amino acid sequence of HSA contains a total of 17 disulphide bridges, one free thiol (Cys 34), and a single tryptophan (Trp 214). Intravenous use of HSA solution has been indicated for the prevention and treatment of hypovolumic shock (see, e.g., Tullis,JAJM,237, 355-360, 460-463, (1977)) and Houser et al.,Surgery, Gynecology and Obstetrics,150, 811-816 (1980)) and in conjunction with exchange transfusion in the teatment of neonatal hyperbilirubinemia (see, e.g., Finlayson,Seminars in Thrombosis and Hemostasis,6, 85-120, (1980)).
Human serum albumin (HSA) has multiple hydrophobic binding sites (a total of eight for fatty acids, an endogenous ligand of HSA) and binds a diverse set of drugs, especially neural and negatively charged hydrophobic compounds (Goodman et al.,The Pharmacological Basis of Therapeutics,9thed, McGraw-Hill New York (1996)). Two high affinity sites have been proposed in subdomains IIA and IIIA of HSA, which are highly elongated hydrophobic pockets with charged lysine and arginine residues near the surface which function as attachment points for polar ligand features (see, e.g., Fehiske et al.,BiochenL Pharmcol.,30, 687-92 (1981), Vorum,Dan. Med Bull.,46, 379-99 (1999), Kragh-HDan. Med Bull,1441, 131-40 (1990), Curry et al.,Nat. Struct. BioL,5, 827-35 (1998), Sugio et al.,Protein Eng.,12, 439-46 (1999), He et al.,Nature,358, 209-15 (1992), and Carter et al.Adv. Protein. Chem.,45, 153-203 (1994)). Paclitaxel and propofol have been shown to bind HSA (see, e.g., Paal et al.,Eur. J Biochem.,268(7), 2187-91 (2001), Purcel et al.,Biochim. Biophys. Acta,1478(1), 61-8 (2000), Altmayer et al.,Armneimiateforschung,45, 1053-6 (1995), and Garrido et al.,Rev. Esp. Anestestiol Reanim.,41, 308-12 (1994)). In addition, docetael has been shown to bind to human plnaproteins (see, e.g., Urien et al.,Invest New Drugs,14(2), 147-51 (1996)). Thus, while not wishing to be bound to any particular theory, it is believed that the inclusion of proteins such as albumin in the inventive phamaceutical compositions results in a reduction in side effects associated with admistration of the pharmaceutical composition that is due, at least in part, to the binding of human serum albumin to any free drug that is present in the composition.
The amount of albumin included in the pharmaceutical composition of the present invention will vary depending on the pharmaceutical active agent, other excipients, and the route and site of intended adminison. Desirably, the amount of albumin included in the composition is an amount effective to reduce one or more side effects the active pharmaceutical agent due to the of administration of the inventive pharmaceutical composition to a human. Typically, the pharmaceutical composition is prepared in liquid form, and the albumin is then added in solution. Preferably, the pharmaceutical composition, in liquid form, comprises from about 0.1% to about 25% by weight (e.g. about 0.5% by weight, about 5% by weight, about 10% by weight, about 15% by weight, or about 20% by weight) of albumin. Most preferably, the pharmaceutical composition, in liquid form, comprises about 0.5% to about 5% by weight of albumin. The pharmaceutical composition can be dehydrated, for example, by lyophilihzion, spray-drying, fluidized-bed drying, wet granulation, and other suitable methods known in the art. When the composition is prepared in solid form, such as by wet granulation, fluidized-bed drying, and other methods known to those skilled in the art, the albumin preferably is applied to the active pharmaceutical agent, and other excipients if present, as a solution. The HSA solution preferably is from about 0.1% to about 25% by weight (about 0.5% by weight, about 5% by weight, about 10% by weight, about 15% by weight, or about 20% by weight) of albumin.
In addition to albumin, the compositions of the present invention preferably comprise deferoxamine. Deferoxamine is a natural product isolated fromStreptomyes pilosus,and is capable of forming iron complexes. Deferoxamine mesylate for injection USP, for example, is approved by the Food and Drug Administion as an iron-chelating agent and is available for intramuscular, subcutaneous, and intravenous adminiration. Deferoxamine mesylate USP is a white to off-white powder. It is freely soluble in water and its molecular weight is 656.79. The chemical name for deferoxamne mesylate is N-[5-[3-[(5-aminopentyl)hydroxycarbamoyl]-propion-amido]pentyl]-3[[5((N -hydroxyacetamido)pentyl]-carbamoyl]propionohydroxamic acid monomethanesulfonate (salt), and its structural formula is C2H48N6O8.CH3SO3H. As described in the Examples, deteroxamine, or analogs, derivatives, or salts (e.g., mesylate salts) thereof inhibits microbial growth and oxidation in the pharmaceutical composition, and it is believed to bind to free drug in the composition. Deferoxamine also has been shown to bind to phenolic compounds (see, e.g., Juven et al.,J Appl. Bacteriol.,76(6), 626-31 (1994)). Paclitaxel, docetaxel, propofol, and the like, are either phenolic like or have phenolic or phenyl substituents. Therefore, it is believed that deferoxamine can bind to or reduce the amount of free drug in the inventive pharmaceutical composition, thereby also reducing or alleviating irritation or pain upon injection.
The amount of deferoxamine, or its preferred salt, i.e., a mesylate salt of deferoxamine, included in the composition will depend on the active pharmaceutical agent and other excipients. Desirably, the amount of deferoxaiiine, its salts, and analogs thereof in the composition is an amount effective to inhibit microbial growth and/or inhibit oxidation. As described above, typically the pharmaceutical composition is prepared in liquid form, and deferoxamine, it salts, and analogs thereof is then added in solution. Preferably, the phamacetical composition, in liquid form, comprises from about 0.0001% to about 0.5% by weight (e.g., about 0.005% by weight, about 0.1%, or about 0.25% by weight) of deferoxamine , its salts, or its analogs. More preferably, the composition, in liquid form, comprises like amounts of the prefered deferoxamine salt, deferoxamine mesylate. Most preferably, the pharmaceutical composition, in liquid form, comprises about 0.1% by weight of deferoxamine mesylate. When the composition is prepared in solid for, as described above, such as by wet granulation, fluidized-bed drying, and other methods known to those skilled in the art, deferoxamine mesylate preferably is applied to the active pharmaceutical agent, and other excipients if present, as a solution. The deferoxamine mesylate solution preferably is from about 0.0001% to about 0.5% by weight (e.g., about 0.005% by weight, about 0.1%, or about 0.25% by weight) of deferoxamine.
In keeping with the invention, the pharmaceutical composition can include other agents, excipients, or stabilizers to improve properties of the composition. For example, to increase stability by increasing the negative zeta potential of nanoparticles or nanodroplets, certain negatively charged components may be added. Such negatively charged components include, but are not linited to bile salts of bile acids consisting of glycocholic acid, cholic acid, chenodeoxycholic acid, taurocholic acid, glycochenodeoxyrholic acid, taurochenodeoxycholic acid, litocholic acid, ursodeoxycholic acid, dehydrocholic acid and others; phospholipids including Lecithin (Egg yolk) based phospholipids which include the follow phosphtdylcholines: palmitoyloleoylphosphatidylcholine, palmitoyllinoleoylphosphatidylcholine, stearoyllinoleoylphosphatidylcholine stearoyloleoylphosphatidylcholine, stearoylaaachidoylphosphatidylcholine, and dipalmitoylphosphatidylcholine. Other phospholipids including L-α-dimyristoylphosphatidylcholine (DMPC), dioleoylphosphatidylcholine (DOPC), distearyolphosphatidylcholine (DSPC), hydrogenated soy phosphatidylcholine (HSPC), D-α-phosphatidylcholine, β-acetyl-γ-hexadecyl, L-α-phosphatidylcholine, β-acetyl-γ-O -hexadecyl, DL-α-phospatidylcholine, β-acetyl-γ-O-hexadecyl, L-α-phosphatidylcholine, βacetyl-γ-O-octadecyl, L-α-pbospltidylcholine, βarachidonoyl-γ-O-hexadecyl, L-αphosphatidylcholine, βacetyl-γ-O-(otadec-9-cis-enyl), D-α-phosphatidylcholine, β-arachidonoyl-γ-O-palritoyl, 3-sn-phosphatidylcholine, 2-arachidinoyl-1-stearoyl, L-αphosphatidylcholine, β-arachidonoyl-γ-stearoyl, L-α- phosphatidylcholine, diarachidoyl, L-α-phosphatidylcholine, dibehenoyl, L-α-phosphatidylcholine, β-(cis-8,11,14-eicosatrienoyl)-γ-O-hexadecyl, L-α-phosphatidylcholine, β-oleoyl-γ-myristoyl, L-α-phosphatidylcholine, β(pyren-1-yl)decanoyl-γ-paiitoyl, 3-sn-phosphatidyl-N,N -dimethylethanolamine, 1,2-dipalmitoyI, L-α-phosphatidyleltntolae, diheptadecanoyl, 3-sn-phosphatidylethanolamine, 1,2dlauroyl, 3-sn-phosphatidylethanolamine, 1,2-dimyristoyl, 3-sn-phosphatidyletoelanae, 1,2dioleoyl, 3-sn-phosphatidylethanolamine, 1,2dipalmitoyl, L-α-phosphatidyledmanolamie, dipalmitoyl, L-αphosplatidyletlhanolamine, dipalhitoyl, N-dansyl, L-α-phosphatidylethanolamine, dipalmitoyl, N,N dimethyl, L-αdimyristoylphosphatidylglycerol (sodium salt) (DMPG), dipalmitoylphosphatidylglycerol (sodium salt) (DPPG), distearoylphosphatidylglycerol (sodium salt) (DSPG), N-(carbonyl-methoxypolyethylene glycol 2000)-,2distearoyl-sn -glycero -phosphoethanolamine sodium (MPEG-DSPE), L-α-phosphatidic acid, didecanoyl sodium salt, L-α-phosphatidic acid, dihecanoyl sodium salt, 3-sn-phosphatidic acid, 1,2-diymiristoyl sodium salt, L-α-phosphatidic acid, dioctanoyl sodium salt, L-α-phosphatidic acid, dioleoyl sodium salt L-α-phosphatidic acid, dipalmitoyl sodium salt, L-α-Phosphatidyl-DL-glycerol, dimyristoyl sodium salt, L-α-phosphatidyl-DL-glycerol, dioleoyl sodium salt, L-α-phosphatdyl-DL-glycerol, dipalmitoyl ammonium salt, L-α-phosphatidyl-DL-glycerol, distearoyl ammonium salt, L-α-phosptidyl-DL-glycerol, β-oleoyl-γ-palmitoyl ammonium salt, L-α-phosphatidylinositol ammonium salt, L-α-phosphatidylinositol sodium salt, L-α-phosphatidyl-L-serme, dioleoyl sodium salt, L-α-phosphatidyl-L-serine, and dipalmitoyl sodium salt. Negatively charged surfts of emulsifiers are also suitable as additives, e.g., sodium cholesteryl sulfite and the like.
The phamaeutical agent (e.g., propofol) may be used alone or dissolved in a water-immiscible solvent. A wide range of water-immiscible solvents such as soybean, safflower, cottonseed, corn, sunflower, arachis, castor, or olive oil may be used. The prefered oil is a vegetable oil, wherein soybean oil is most preferred. Soybean oil may be used in a range of 1% to 10% by weight of the composition. Preferably soybean oil is present in the pharmaceutical composition in an amount of about 3% by weight.
The inventive pharmaceutical composition can be stabilized with a pharmaceutically acceptle surfactant. The term “surfactants,” as used herein, refers to surface active group(s) of amphiphile molecules. Surfants can be anionic, cationic, nonionic, and zwitterionic. Any suitable surfactant can be included in the inventive pharmaceutical composition. Suitable surfilts include non-ionic suractants such as phosphatides, polyoxyethylene sorbitan esters, and tocopheryl polyethylene glycol succinate. Preferable surfactants are egg lecithin, tween 80, and vitamn E-t d-α-tocopheryl polyethylene glycol-1000 succinate (TPGS). For soybean oil containing formulations, egg lecithin is preferred and is no more than 1.2% by weight for a formulation containing 3% soybean oil, preferably at 1.1% by weight of the composition. For formulations without soybean oil tween 80 or vitamin E-TPGS are the preferred surfcnts. Typically, 0.1 to 1.5% by weight of tween 80 or 0.5 to 4% by weight of vie E-TPGS is suitable. Preferably, 1.5% by weight of tween 80 or 1% by weight of vitamin E-TPGS is used. Examples of other suitable surctants are described in, for example, Becher,Emulsions: Theory and Practice,Robert E. Krieger Publishing, Malabar, Fla. (1965).
There are a wide variety of suitable formulations of the inventive pharmaceutical composition (see, e.g., U.S. Pat. No. 5,916,596). The following formulations and methods are merely exemplary and are in no way limiting. Formulations suitable for oral administration can consist of (a) liquid solutions, such as an effective amount of the compound dissolved in diluents, such as water, saline, or orange juice, (b) capsules, sachets or tablets, each containing a predetermined amount of the active ingredient, as solids or granules, (c) suspensions in an appropriate liquid, and (d) suitable emulsions. Tablet forms can include one or more of lactose, manitol, corn starch, potato starch, microcryslline cellulose, acacia, gelatin, colloidal silicon dioxide, croscarmellose sodium talc, magnesium stearate, stearic acid, and other excipients, colorants, diluents, buffering agents, moistening agents, preservatives, flavoring agents, and phamacologically compatible excipients. Lozenge forms can comprise the active ingredient in a flavor, usally sucrose and acacia or tragacant, as well as pastiles comprising the active ingredient in an inert base, such as gelatin and glycerin, or sucrose and acacia, emulsions, gels, and the like containing, in addition to the active igrdient, such excipients as are known in the art
Formulations suitable for parenteral administration include aqueous and non-aqueous, isotonic steile injection solutions, which can contain anti-oxidants, buffers, bacteriostats, and solutes that render the formulation isotonic with the blood of the intended recipient, and aqueous and non-aqueous sterile suspensions that can include suspending agents, solubilizers, thickening agents, stabilizs, and preservatives. The formulations can be presented in unit-dose or multi-dose sealed containers, such as ampules and vials, and can be stored in a freeze-dried (lyophilized) condition requiring only the addition of the sterile liquid excipient, for example, water, for injections, immediately prior to use. Extemporaneous injection solutions and suspenons can be prepared from sterile powders, granules, and tablets of the kind previously described. Injectable formulations are preferred.
Formulations suitable for aerosol administration comprise the inventive pharmaceutical composition include aqueous and non-aqueous, isotonic sterile solutions, which can contain anti-xidants, buffers, bacteriostats, and solutes, as well as aqueous and non-aqueous sterile suspensions that can include suspending agents, solubilizers, thickening agents, stabilizers, and preservatives, alone or in combination with other suitable components, which can be made into aerosol formulations to be administered via inhalation. These aerosol formulatons can be placed into pressurized acceptable propellants, such as dichlorodifluoromethane, propane, nitrogen, and the like. They also can be formulated as pharmaceuticals for non-pressured preparations, such as in a nebulizer or an atomizer.
Other suitable formulations are possible, for example, suppositories can be prepared by use of a variety of bases such as emulsjfng bases or water-soluble bases. Formulations suitable for vaginal adinistration can be presented as pessaries, tampons, creams, gels, pastes, foams, or spray formulas containing, in addition to the active ingredient, such carriers as are known in the art to be appropriate.
In a preferred embodiment of the invention, the pharmaceutical composition is formulated to have a pH range of 4.5 to 9.0, and more preferably a pH of 5.0 to 8.0. The pharmaceutical composition can also be made to be isotonic with blood by the addition of a suitable tonicity modifier, such as glycerol. Moreover, the pharaceutically acceptable carrier preferably also comprises pyrogen-free water or water for injection, USP. Preferably, the inventive pharmaceutical composition is prepared as a sterile aqueous formulation, a nanoparticle, an oil-in-water emulsion, or a water-in-oil emulsion. Most preferably, the pharmaceutical composition is an oil-in-water emulsion.
For a pharmaceutical composition comprising propofol, in accordance with the invention, an oil-in-water emulsion is prepared by dissolving propofol in a water-immiscible solvent alone, and preparing an aqueous phase contaiing albumin, deferoxamine, a surfactant, and other water-soluble ingredients, and mixing the oil with the aqueous phase. Th crude ennikon is high pressure homogenized at pressures of 10,000 to 25,000 psi and recirculated for 5 to 20 cycles to form an ideal emulsion. The preferred pressure is 15,000 to 20,000 psi, and more preferably 10,000 psi. The crude emulsion may be recirculated from 7 to 15 cycles and is preferably recirculated at 15 cycles. Alternatively, discrete passes through a homogenizer may be used.
Preferably, the inventive pharmaceutical composition can have a particle or droplet size less than about 200 nanometdrs (nm). For example, in the case of paclitaxel, docetaxel, rapamyci, cyclosporine, propofol and others, the mean size of these dispersions is less than 200 nm.
The invention further provides a method for reducing one or more side effects associated with adnintson of a pharmaceutical composition to a human. The method comprises adminiating to a human a pharmaceutical composition comprising a pharmaceutical agent and a phmmaceutically acceptable carrier, wherein the pharmaceutically acceptable camer comprises albumin and deferoxamine. Descrptions of the pharmaceutical composition, pharmaceutical agent, and pharmaceutically acceptable carrier, and components thereof set forth above in connection with the inventive pharmaceutical composition, also are applicable to those same aspects of the inventive method.
The dose of the inventive pharmaceutical composition administered to a human, in the context of the invention, will vary with the particular pharmaceutical composition, the method of administration, and the particular site being treated. The dose should be sufficient to effect a desirable response, such as a therapeutic or prophylactic response against a particular disease, or, when the pharmaceutical agent is an anaestesia, such as propofol, an anesthetic response, within a desirable time frame.
While any suitable means of administering the pharmaceutical composition to the human can be used within the context of the invention, preferably the inventive pharmaceutical composition is administered to the human via intravenous administration, intra-arterial administration. intrapulmora administration, oral administration, inhalation, intravesicular administration, muscular administration, intra-tracheal administration, subcutaneous administration, intraocular administration, intrathecal administration, or transdermal ainistation. For example, the inventive pharmaceutical composition can be adminiinsted by inhalation to treat conditions of the respiratory tact. There are minimal side-effects associated with the inhalation of the inventive pharmacetnial composition, as albumin is a natural component in the lining and secretions of the respiratory tract. The inventive composition can be used to treat respiratory conditions such as pulmonary fibrosis, broncheolits obliterans, lung cancer, bronchoalveolar carcinoma, and the like.
The inventive method results in the reduction of one or more side effects aosociated with administration of a pharmaceutical composition to a human. Such side effects include, for example, myelosuppression, neurotoxicity, hypersensitivity, inflammation, venous irritation, phlebitis, pain, slin iritation, and combinations thereof. These side effects, however, are merely exemplary, and other side effects, or combination of side effects, associated with various pharmaceutical agents can be reduced or avoided by the use of the novel compositions and methods of the present invention.
The invention further provides a method for fhiwbiting microbial growth in a pharmaceutical composition. By “inhibing microbial growth” is meant either a complete elimination of microbes from the pharmaceutical composition, or a reduction in the amount or rate of microbial growth in the pharmaceutical composition. The method comprises preparing a pharmaceutdcal composition comprising a phmacutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises deferoxamine, its salts, its analogs, and combinations thereof, in an amount effective for inhibiting microbial growth in the pacutical composition. In addition, the invention provides a method for inhibiting oxidation of a pharmaceutical composition. This method comprises preparing a pharmacutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises deferoxamine, its salts, its analogs, and combinations thereof, in an amount effective for inhibiting oxidation of the pharmaceutical composition. Descriptions of the pharmaceutical composition, pharmaceutical agent, and pharmaceutically acceptable carrier, and components thereof set forth above in connection with the inventive pharmaceutical composition, also are applicable to those same aspects of the inventive method.
The amount of deferoxamine, or its preferred salt, a mesylate salt of deferoxamine, included in the composition will depend on the active phalrmaceutical agent and other excipients. Desirably, the amount of deferoxamine, its salts, and analogs thereof in the composition is an amount effective to inhibit microbial growth and/or inhibit oxidation. As described above, typically, the phamaceutical composition is prepared in liquid form, and deferoxamine, it salts, and analogs thereof, is then added in solution. Preferably, the pharmaceutical composition, in liquid form, comprises from about 0.0001% to about 0.5% by weight (e.g., about 0.005% by weight, about 0.1%, or about 0.25% by weight) of deferoxamine, its salts, or its analogs. More preferably, the composition, in liquid form comprises like amounts of the preferred deferoxamine salt, deferoxamine mesylate. Most preferably, the pheuaical composition, in liquid form, comprises about 0.5% by weight of deferoxamine mesylate. When the composition is prepared in solid form as described above, such as by wet granulaton, fluidized-bed drying, and other methods known to those skilled in the art, deferoxasmne mesylate preferably is applied to the active pharmaceual agent, and other excipients if presen, as a solution. The deferoxanine mesylate solution preferably is from about 0.0001% to about 0.5% by weight (e.g., about 0.005% by weight, about 0.1%, or about 0.25% by weight) of deferoxamine.
The invention also provides a method for enhancing transport of a pharmaceutical agent to the site of an infirmity, which method comprises administering to a human a pharmaceutical composition comprising a pharmaceutical agent and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises albumin, and wherein the ratio of albumin to pharmaceutical agent in the pharmaceutical composition is about 18:1 or less. The invention further provides a method for enhancing binding of a phamaceutical agent to a cell in vitro or in vivo, which method comprises administering to said cell in vitro or in vivo a pharmaceutical composition comprising a pbancaceutical agent and a pharmaceutically acceptble carrier, wherein the pharmaceutically accepable carrier comprises albumin, and wherein the ratio of albumin to pharmaceutical agent in the pharmaceutical composition is about 18:1 or less. Descriptions of the pharmaceutical composition, pharmaceutical agent, pharmaceutically acceptable carrier, administration routes, and components thereof set forth above in connection with the inventive pharmacau composition and inventive method also are applicable to those same aspects of the tansport and binding methods.
In the methods for enhancing transport of a pharmaceutical agent to the site of an infirmity or for enhancing binding of a phamaceutical agent to a cell, the pharmaceutically acceptable carrier preferably comprises albumin, most preferably human serum albumin. Not to adhere to any one particular theory, it is believed that the ratio of protein, e.g., human serum albumin, to pharmaceutical agent in the pharmaeutical composition affects the ability of the pharmaceutical agent to bind and transport the phareutical agent to a cell. In this regard, higher ratios of protein to pharmaceutical agent generally are associated with poor cell binding and transport of the phamaceutical agent, which possibly is the result of competition for receptors at the cell surface. The ratio of protein, e.g., albumin, to active pharmaceutical agent must be such that a sufficient amount of pharmaceutical agent binds to, or is transported by, the cell. Exemplary ranges for protein-drug preparations are protein to drug ratios (w/w) of 0.01:1 to about 100:1. More preferably, the ratios are in the range of 0.02:1 to about 40:1. While the ratio of protein pharmaceutical agent will have to be optimized for different protein and phaceutical agent combinations, generally the ratio of protein, e.g., albumin, to pharmaeutical agent is about 18:1 or less (e.g., about 15:1, about 10:1, about 5:1, or about 3:1). More preferably, the ratio is about 0.2:1 to about 12:1. Most preftrnly, the ratio is about 1:1 to about 9:1. Preferably, the formulation is essentially free of cremophor, and more preferably free of Cremophor EL® (BASF). Cremophor EL® is a non-ionic emulsifying agent that is a polyether of castor oil and ethylene oxide. As described above, cremophor typically is used as a solvent for paclitaxel, and is associated with side effects that can be severe (see, e.g., Geldeblom et al., supra).
The pharmaceutical agent can be any suitable pharmaceutical agent described herein (e.g., propofol, paclitaxel, or doxel). In addition, the plamaeutical agent can be a nucleic acid sequence, most preferably a DNA sequence. In this regard, the inventive pharmaceutical composition can be used to transport genes to a cell by way of a receptor mediated/caveolar/vescicular transport. In order to transport DNA sequences, such as genes or other genetic material, including but not limited to plasmids or c-DNA, into a cell (e.g. an endothelial cell or a tumor cell), pharmaceutical compositions comprising albumin in combination with genetic material can be prepared. Since tumor cells and other cells in sites of inflammation have high uptake for proteins, the genetic material is preferentially taken up into these cell types and may be incorporated into the getic material of the cell for a useful therapeutic effect. The use of protins, such as human serum albumm, serves as a non-viral veatr for the delivery of genetic material without the risk of virus-associated diseases or side effects. For example, a pharmaceutical composition comprising the nucleic acid sequence encoding β-galactosidase or green fluorescent protein (GFP) and albumin can be prepared and contacted with endothelial cells derived from human umbilical vein or human lung microvessels to facilitate incorporation of the nucleic acid sequence into the endothelial cells. Incorporation of the nucleic acid sequence can be detected using methods known in the art, such as, for example, fluorescence or staining.
In the inventive method for enhancing transport of a pharmaceutical agent to the site of an infirmity, the inftrmty can be any suitable disease or condition. Preferably, the infirmity is cancer, cardiovascular disease, or arthritis.
In the inventive method for enhancing binding of a pharmaceutical agent to a cell in vitro or in vivo, the pharmaceutical composition is adinistered to a cell in vitro or in vivo. Desirably, the cell is an animal cell. More preferably the cell is a mammalian cell, and most preferably the cell is a human cell. The pharmaceutical composition preferably is administered to a cell in vivo. The cell can be any suitable cell that is a desirable target for administration of the pharmaceutical composition. For example, the cell can be located in or derived from tissues of the digestive system including, for example, the esophagus, stomach, small intestine, colon, rectum, anus, liver, gall bladder, and pancreas. The cell also can be located in or derived from tissues of the respiratory system, including, for example, the larynx, lung, and bronchus. The cell can be located in or derived from, for example, the uterine cervix, the uterine corpus, the ovary vulva, the vagina, the prostate, the testis, and the penis, which make up the male and female genital stems, and the urinary bladder, kidney, renal pelvis, and ureter, which comprise the urinary system. The cell can be located in or derived from tissues of the cardiovascular system, including, for example, endothelial cells and cardiac muscle cells. The cell also can be located in or derived from tissues of the lymphoid system (e.g., lymph cells), the nervous system (e.g., neurons or glial cells), and the endocrre system (e.g., thyroid cells). Preferably, the cell is located in or derived from tissues of the cardiovascular system. Most preferably, the cell is an eldothelial cell. In the context of the inventive method for enhancig transport and enhancing binding of a pharmaceutical agent to a cell, the pharmaceutical composition desirably contacts more than one cell.
In another aspect of the invention, the inventive methods for enhancing transport and enhancing binding of a pharmaceutical agent to a cell can be used to treat tumor cells. Tumor cells exhibit an enhanced uptake of proteins including, for example, albumin and transferin, as compared to normal cells. Since tumor cells are dividing at a rapid rate, they require additional nutrient sources compared to normal cells. Tumor sies of the inventive pharmaceutical compositions containig paclitaxel and human serum albumin showed high uptake of albumin-paclitaxel into tumors. This has been found to be due to the previously unrecognized phenomenon of the albumin-drug transport by glycoprotein 60 (“gp60”) receptors, which are specific for albumin.
Thus, in accordance with another aspect of the present invention, the albumin-specific gp60 receptor and other protem transport receptors that are present on tumor cells can be used as a target to inhibit tumor growth. By blocking the gp60 receptor using antibodies against the gp60 receptor or other large or small molecule compounds that bind, block, or inactivate gp60 and other protein transport receptors on tumor cells or tumor endothelial cells, it is possible to block the tansort of proteins to these cells and thereby reduce their growth rate and cause cell death. Blocking of this mechanism thus results in the treatment of a subject (e.g., a human) with cancer or another disease. Identification of blocking/binding of the specific protein receptor is done by screening any number of compounds against the isolated gp60 or other receptors, such as gp 16 or gp30, or by using a whole cell preparation. In addition, suitable animal models also can be used for this purpose, such as, for example, mice containing “knockout” mutations of the genes encoding gp60 or caveolin-1, or other proteins that are specific for transport. Thus, method of identification of compounds that block or bind gp60, gp16, gp30, or other protein receptors are within the scope of the invention.
In addition, compounds that block or bind the gp60 receptor or other protein receptors can be used in the treatment of several diseases, including cancer. With respect to the treatment of cancer, the blocking or binding compound may be used as a single agent or in combination with other standard chemotherapy or chemotherapies. For example, it is usefuil to treat the cancer with conventional chemotherapy, or with the inventive albumin-drug phamaceutical compositions (which show high accumulation in tumors), followed by compounds that block the transport of proteins to the tumor cell. Blocking compounds can be administed prior to, or in conjunction with, other chemotherapeutic or anticancer agents. Thus, any compoumds that can block or bind the gp60 receptor, or other protein receptors, are within the scope of the present invention.
The inventive albumin-drug compositions, such as e.g., albumin-paclitaxel, albumin-docetaxel, albumin Sothilone, albumn-camptothecin, or albumin-rapamycin, and others, are useful in the treatment of diseases. It is believed that such drug compositions are effective due to increased receptor mediated transport of the protein-drug composition to the required site, for example a tumor. Without wishing to be bound to any particular theory, the transport of a protein-drug composition by receptor mediated tanort resulting in a therapeutic effect is believed to be the mechanism for transport of for example, albumin-paclitaxel compositions to a tumor, as well as albumin-paclitaxel and albumin-rapamycin transport across the lung. Transport is effected by the presence of gp60, gp16, or gp30 in such tissues. Accordingly, drugs and protein-drug compositions whose transport to sites of disease, e.g., inflarnmation (e.g., arthritis) or tumors is associated with gp60, gp16, or gp30 receptors and that result in a therapeutic effect are contemplated as compositions of the present invention.
In accordance with another aspect of the present invention, endothelial cells can be co-cultured with cells having a specific function. Incubation of endothelial cells with other cell types such as islet cells, hepatocytes, neuroendocrine cells, and others allows for required transport of components such as proteins and other beneficial components to these cells. The endothelial cells provide for transport of these components to the cultured cell types in order to simulate in vivo conditions, i.e., where these cell types would normally be in close proximity to endothelial cells and would depend on the endothelial cells for transport of nutrients, growth fators, hormone signals, etc. that are required for their proper function. It has previously not been possible to adequately culture these different cell types and obtain physiological performance when endothelial cells were absent. The presence of endothelial cells in cuture with desired cell types allows for differentiation and proper functioning of islets, hepaocytes, or neuroendocrine tissue in vitro or ex vivo. Thus it is found that coculture of endothelial cells with islets results in islets with improved physiological properties e.g., ability to secete insulin, when compared with those cultured in the absence of endothelial cells. This tissue can then be used ex vivo or transplanted in vivo to treat diseases caused by lack of adequate cellular function (e.g., diabetes in the case of islet cells, hepatic dysfunction in the case of hepatocytes, and neuroendocrine disorders or pain relief in the case of neuroendocrine cells). Cells orginatng from other tissues and organs (as descried above) may also be cocultured with endothelial cells to provide the same benefit. In addition, the coculture may be ulized to incorporate genetic material into the target cell tpes. The presence of albumin in these cultures is found to be greatly beneficial.
The following examples further illustrate the invention but, of course, should not be construed as in any way limitng its scope.
This example demonstrates the preparation of pharmaceutical compositions comprising paclitaxel and albumin. Preparation of paclitaxel-albumin compositions is described in U.S. Pats. 5,439,686 and 5,916,596, which are incorporated in their entirety by reference. Specifically, 30 mg of paclitaxel was dissolved in 3.0 ml methylene chloride. The solution was added to 27.0 ml of human serm albumin solution (2% w/v). Deferoxamine was added as necessary. The was homogenized for 5 mmutes at low RPM (Vitris homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transfenred into a rotary evaporator, and methylene chloride was rapidly removed at 400° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent, and the typical average diameter of the resulting paclitaxel particles was in the range 50-220 nm (Z-average, Malvem Zetasizer). The dispersion was further lyophilzed for 48 hrs. The resulting cake could be easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size aeter reconstitution was the same as before lyophilization.
It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in any way. When compared to toxicity of paclitaxel dissolved in cremophor formulations, the inventive pharmaceutical composition containing albumin showed substantay lower toxicity.
This example demonstrates the preparation of a phmaceutical composition comprising amiodarone and albumin. 30 mg of amiodarone was dissolved in 3.0 ml methylene chloride. The solution was added to 27.0 ml of human serum albumin solution (1% w/v). Deferoxamine was added as necessary. The mixture was homogenied for 5 minutes at low RPM (Vitis homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulisification was performed at 9000-40,000 psi while reycling the emulsion for at least 5 cycles. The resulting system was tansferred into a rotary evaporator, and methylene chloride was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent, and the typical average diameter of the resulting amiodarone particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hr. The resulting cake was easily reconsti to the originad dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization.
It should be recognzed that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in anyway. When compared to toxicity of amiodarone dissolved in tween formulations, the inventive pharmaceutical composition with albumin showed substantially lower toxicity.
This example demonstrates the preparation of pharmaceutical compositions comprising liothyronine and albumin compositions. Liothyronine (or suitable salt) was dissolved in an aqueous alcoholic solution or alkaline solution at a concentraion of 0.5-50 mg/ml. The alcoholic (or alkaline) solution was added to an albumin solution (0.1- 25% w/v) and agitated. Agitation was low shear with a stirrer or high shear using a sonicator or a homogenizer. At low concentrations of liothyronine, (5- 1000 μg/ml) clear solutions were obtained. As the concentration was increased, a milky stable suspension was obtained. These solutions or suspensions were filtered through a sterilizing filter. Organic solvents were removed by evaporation or other suitable method.
This example demonstrates the preparation of pharmaceutical compositions comprising rapamycin and albumin. 30 mg of rapamycin was dissolved in 2 ml chloroform/ethanol. The solution was then added into 27.0 ml of a human serum albumin solution (3% w/v). The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogeneer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resuling dispersion was translucent and the typical average diameter of the resuling particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of sterle water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in anyway.
This example demonstrates the preparation of a pharmaceutical composition comprising epoilone B and albumin. 30 mg of epothilone B was dissolved in 2 ml chloroform/ethanol. The solution was then added into 27.0 ml of a human serum albumin solution (3% w/v). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was tansfered into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent and the typical average diameter of the resulting particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the orginal dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognzed that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting. When compared to toxicity of epothilone B dissolved in cremophor formulations, the pharmaceutical composition comprising albumin showed substantially lower toxicity.
This example demonstrates the preparation of pharmaceutical compositions comprising colchicine dimer and albumin 30 mg of colchicine-dimer was dissolved in 2 ml chloroform/ethanol. The solution was then added into 27.0 ml of human serum albumin solution (3% w/v). Deferoxarnne was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was traslucent and the typical average diameter of the resulting paricles was in the range 50-220 nm (Z-average, Malvem Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of steile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting. When compared to toxicity of the colchicines dimer dissolved in tween, the pharmaceutical composition comprising albumin showed substantially lower toxicity.
This example demonstrates the preparaton of pharmaceutical compositions comprising docetaxel and albumin. 30 mg of docetaxel was dissolved in 2 ml chloroforn/ethanol. The solution was then added into 27.0 ml of human serum albumin solution (3% w/v). Deferoxamine was added as necessary. The mix was homogenized fr 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenlzer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resuing dspersion was translsucent and the typical average diameter of the resulting particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size after reconsttution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, and proteins used in this example are not limiting. When compared to toxicity of the docetaxel dissolved in tween/ethanol which is the standard solvent for this drug, the phamacetical composition comprising albumin showed substantially lower txicity.
This example demonstrats the preparation of pharmaceutical compositions comprising docetaxel and albumin. 150 mg of docetaxel was dissolved in 1 ml ethyl acetate/butyl acetate and 0.5 ml of an oil for example soybean oil or vitamin E oil. Other ratios of solvents and oils were used and these compositions are also contemplated as part of the invention. A small quantity of a negatively charged component was also optionally added, e.g., benzoic acid (0.001%-0.5%) The solution was then added into 27.0 ml of human serum albumin solution (5% w/v). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitis homogen model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestn). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent and the typical average diameter of the resuling particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstiteeed to the original dispersion by addition of sterile water or saline. The particle size after reconstituton was the same as before lyophiiiaaon. It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting. When compared to toxicity of the docetaxel dissolved in tween/ethanol which is the standard solvent for this drug, the pharmaceutical composition comprising albumin showed substaintially lower toxicity.
This example demonstrates the preparation of pharmaceucal compositions comprising a taxane IDN5390 and albumin. 150 mg of IDN5390 was dissolved in 1 ml ethyl acetate/butyl acetate and 0.5 ml of an oil for example soybean oil or vitamin E oil. Other ratios of solvens and oils were used and these compositions are also contemplated as part of the invention. A small quantity of a negatively ciarged component was also optionally added, e.g, benzoic acid (0.0010%-0.5%) The solution was then added into 27.0 ml of human serum albumin solution (5% w/v). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then tnsferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emidsion for at least 5cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent and the typical average diameter of the resulting particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting. When compared to toxicity of the IDN5390 dissolved in tween, the pharmaceutical composition comprising albumin showed substantially lower toxicity.
This example demonstrates the preparation of pharmaceutical compositions comprising a taxane IDN5109 and albun. 150 mg of IDN5109 was dissolved in 2 ml chloroform/ethanol. Other ratios of solvents and oils were used and these compositions are also contemplated as part of the invention. A small quantity of a negatively charged component was also optionaly added, e.g., benzoic acid (0.001%.5%) The solution was then added into 27.0 ml of human serum albumin solution (5% w/v). Deftioxamine was added as necessary. The mixture is homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for a least 5 cycles. The resulting system was transferred into a Rotavap and solvend was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minuts. The resulting dispersion was translucent and the typical average diameter of the resiuting particles was in the range 50-220 nm (Z-average, Malvern ). The dispersion was e lyphilized for 48 hours. The resulting cake was easily reconstited to the orginal dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, and proteins used in this example are not limitng. When compared to toxicity of the IDN5109 dissolved in tween, the phawiaceutcal composition comprising albumin showed substantially lower toxicity.
This example demonstrates the preparation of a pharmaceutical composition comprising 10-hydroxy camptothecin (10HC) and albumin. 30 mg of 10-HC was dissolved in 2.0 ml DMF/methylene chloride/soybean oil. The solution was then added into 27.0 ml of a human serum albunin solution (3% w/v). The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then tansferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a Rotavap and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent and the typical average diameter of the resulting particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not liiting im anyway.
This example demonstrates the preparation of a pharmaceutical composition comprising cyclosporine and albumin. 30 mg of cyclosporine was dissolved in 3.0 ml methylene chloride. The solution was then added into 27.0 ml of a human serum albumin solution (1% w/v). The mixture was homogenized for 5 minues at low RPM (Vitris homogenizer model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulsificion was perfomed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was sferred into a Rotavap and methylene chloride was rapidly removed at 400° C., at reduced pressure (30 mm Hg) for 20-30 miutes. The resulting dispersion was translucent and the typical average diameter of the resulting particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hours. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilzation.
This example demonstrates the preparation of a pharraceutical composition containing oil and comprising cyclosporine and albumin. 30 mg of cyclosporine was dissolved in 3.0 ml of a suitable oil (sesame oil containing 10% orange oil). The solution was then added into 27.0 ml of a human serum albumin solution (1% v/w). The mixture was homogenized for 5 minutes at low RPM (Vitis homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transfeered into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting dispersion had a typical average diameter in range of 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was used directly or lyophilized for 48 hours by optionally adding a suitable cryoprotectant. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. It should be recognized that the amounts, types and proportions of drug, solvents, and proteins used in this example are not liming in anyway.
This example demonstrates the preparation of a pharmaceutical composition comprising amphotericin and albumin. 30 mg of amphotericin was dissolved in 3.0 ml methyl pyrrolidinone/methylene chloride. The solution was added to 27.0 ml of a human serum albumin solution (1% w/v). The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestn). The emulsification was performed at 9000-40,000 psi while recycling the emusion for at least 5 cycles. The resulting system was transferred into a rotary evaporator, and solvent was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was transuent, and the typical average diameter of the resulting amphoterin particles was between 50-220 nm (Z-average, Malven Ztasizer). The dispersion was further lyophilized for 48 hrs. The resulting cake could be easly reconstitd to the original dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. It should be recognized that the amounts, types and proportions of drug, solvents, and proteins used in this example are not limiting in anyway. Addition of other components such as lipids, bile salts, etc., also resulted in suitable formulations.
This example demonstrates preclinical pharmacoknetics and pharmacodynamics of a pharmaceutical composition comprising albumin and paclitaxel.
Several preclinical pharmacokinetic studies in mice and rats were conducted to evaluate the possible advantages of albumnin-paclitaxel pharmaceutical compositions over cremophor-paclitaxel (Taxol) pharmacutical compositions. These studies demonstrated: (1) that the pharmacokinetics of albumin-paclitaxel in rats was linear, whereas Taxol pharmacokinetics were non-linear with respect to dose, (2) pharmaceutical compositions comprising albumin and paclitaxel exhibited a lower plasma AUC and Cmas, suggesting more rapid distribution of alburmin-paclitaxel compositions to tissues compared with Taxol (excretion is similar), (3) pharmaceutical compositions comprising albumin and paclitaxel exhibited a lower Cmax, which possibly accounts for the reduced toxicities associated with peak blood levels relative to Taxol, (4) the half-life of pharmaceutical compositions comprising albumin and paclitaxel exhibited was approximately 2-fold higher in rats and 4-fold higher in tumor be mice relative to TaxoL and (5) the metabolism of paclitaxel in pharmaceutical compositions comprising albumin and paclitaxel was slower than in Taxol pharmaceutical compositions. At 24 hours post-injection in rats, 44% of total radioactivity was still associated with paclitaxel for pharmaceutical compositions comprising albumin and paclitaxel, compared to only 22% for Taxol. The ultimate effect of the above pharmaodynamics, i.e., enhanced inta-cellular uptake, prolonged half-life and slower metabolism for pharmaceutical compositions comprising albumin and paclitaxel exhibited resulted in a tumor AUC 1.7-fold higher, tumor Cmas1.2-fold higher, and tumor half-life 1.7-fold longer than for Taxol in tumor beaing mice.
This example demonrtrates reduced side effects and reduced toxicity associated with pharmaceutical compositions comprising paclitaxel and albumin.
Due to the unique nature of pharmaceutical compositions comprising paclitaxel and albumin in the absence of cremophor, the toxicity of pharmaceutical compositions comprising paclitaxel and albumin is substantially lower than Taxol. In preclinical studies in mice and rats, a single dose acute toxicity study in mice showed an LD50dose approximately 59 times greater for pharmaceutical compositions comprising paclitaxel and albumin than for Taxol. In a multiple dose toxicity study in mice, the LD50dose was approximately 10-fold greater for pharmaceutical compositions comprising paclitaxel and albumin than for Taxol. A further study evaluated the degree of myelosuppression in rats treated with phamaceutical compositions comprising paclitaxel and albumin and Taxol. The results showed that at equi-dose, pharmaceutical compositions comprising paclitaxel and albumin produced considerably less myelosuppression in rats than Taxol. In an acute toxicity study in rats, cerebral cortical necrosis or severe neurotoxicity was observed in animals receiving Taxol at 9 mg/kg but was absent in animals receiving a pharmaceutical composition comprising paclitaxel and albumin at a dose of up to 120 mg/kg. Thus the presence of albumm in a pharmaceutical composition comprising paclitaxel results in a substantial reduction in side effects and toxicity when compared to conventional pharmceutical compositions comprising paclitaxel.
This example demonstrates the clinical effects of a prmaceutal composition comprising paclitaxel and albumin in humans.
Clinical studies in over 500 humnan patients to date provide evidence supporting the reduction in toxicity and side-effects for a phamaceutical composition comprising paclitaxel and albumin (“albumm-paclitaxel”) when compared with cremophor-paclitaxel compositions (Taxol). In a phase I study of 19 patients, the maximuum tolerated dose of albumin-paclitaxel given every 3 weeks was 300 mg/m2. This is substantially higher than the generally administered dose of cremophor-paclitaxel which is 175 mg/m2given once every 3 weeks. The hematological toxicities in these patients were mild with no hypersensitivities, mild neuropathies, and no administration related side effects such as venous iritation, etc.
In another phase I study of 27 patients, the maximum tolerated dose of albumin-paclitaxel given on a weekly schedule was 125-150 mg/m2. This is substantially higher than the generally admiisterd dose of cremophor-paclitaxel which is 80 mg/m2when given on a weekly schedule. The hematological toxicities in these patients were mild with no hypersensitivities, mild neuropathies, and no administration related side effects such as venous irritation, etc.
In two phase II studies of albumin-paclitaxel given at either 175 or 300 mg/m2 every 3 weeks in 43 and 63 patients restively, hematological toxicities were low with only 7% and 24% of patients with ANC<500/mm3at 175 mg/m2and 300 mg/m2 respectively. Severe neuropathy occurred in 0% and 14% of patients for 175 mg/m2and 300 mg/m2respectively. There was no incidence of severe hypersensitivity, and no incidence of administration related side effects such as venous-irritation, pain on injection, etc. These side effects were substantially lower han eperienced with Taxol.
In phase III trials comparing the albumin-paclitaxel composition ABI-007 against Taxol (which contains cremophor-paclitaxel), the dose of ABI-007 was substantially higher (260 mg/m2vs. 175 mg/m2for Taxol) indicating it was better tolerated. The albumin-paclitaxel compositions also demonstrated significantly reduced neutropenia when compared to cremophor-paclitaxel.
This example demonstrates enhanced preclinical efficacy using a pharmaceutial composition comprising albumin and paclitaxei.
An in vitro cytotoxicity study comparing the effect of albmiin-paclitaxel and Taxol on cervical squamous cell carcinoma A431 showed an approximately 4-fold increase in cytotoxic activity for albumin-paclitaxel with an IC50of 0.0038 and 0.012 μg/ml for albumin-paclitaxel and Taxol respectively.
In five different human xenograft tumor models in athymic mice (MX-1 mammary, NCI-H522 lung, SK-OV-3 ovaran, PC-3 prostate, and HT-29 colon), the MTD or equitoxic dose of ABI-007 was 1.5-3.4-fold higher than for Taxol, and resulted in statistically significant improvement in tumor growth delay (<05) in all tumors except the lung tumor (p=5).
In the MX1 mammrny model, one hundred percent (100%) of albumin-paclitaxel treated animals survived 103 days, as compared to 20-40% surviving in groups treated with equivalent doses of Taxol.
This example demonstrates enhanced clinical efficacy using a pharmaceutical composition comprising albumin and paclitaxel administered intra-arterially.
In a Phase I/II Study of intra-arterial administration of a pharmaceutical composition comprising albumin and paclitaxel, as described herein, patients were enrolled for head & neck caner (N=31) and cancer of the anal canal (N=12). The dose escalated from 120-300 mgmm2given over 30 minutes by percutaneous superselective intra-arterial infusion, q 3-4wk. Head and neck cancer patients exhibited a response rate of 76% (N=11), while patients with cancer of the anal canal exhibited a response rate 64% (N=11).
This example demonses the preparation of a pharmaceutical composition containing 3% oil and comprising propofol and albumin.
An oil-in-water emulsion containing 1% (by weight) of propofol was prepared as follows. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and stirred until dissolved. The aqueous phase was passed through a filter (0.2μm filter). The oil phase was prepared by dissolving egg lecithin (0.4% by weight) and propofol (1% by weight) into soybean oil (3% by weight) at about 50° C.-60° C. and was stirred urrtu dissolved. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for 15 cycles at 5° C. Alterately, discrete passes through the homogenizer were used. The inal emulsion was filtered (02 μm filter) and stored under nitrogen. The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumin 0.5-3%; soybean oil 0.5-3.0%,; egg lecithin 0.12-1.2%; glycerol 2.25%; water for injecon q.s. to 100; pH 5-8. Suitable chelators, e.g., deferoxamine (0.001-0.1%), were optionally added.
This example demonstrates the preparation of a phamacetcal composition containing 5% oil and comprising propofol and albumin.
An oil-in-water emulsion containing 1% (y weight) of propofol was prepared as follows. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and was stirred until dissolved. The aqueous phase was passed through a filter (0.2μm filter). The oil phase as prepared by dissolving egg lecithin (0.8% by weight) and propofol (1% by weight) into soybean oil (5% by weight) at about 50° C.-60° C. and was stirred until dissolved. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for 15 cycles at 5° C. Alternately, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2μm filter) and stored under nitrogen. The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumin 0.5-3%; soybean oil 0.5-10.0%; egg lecithin 0.12-1.2%; glycerol 2.25%; water for injection q.s. to 100; pH 5-8. Suitable chelators, e.g., deferxamine (0.001-0.1%), were optionally added.
This example demonses the preparation of a pharmaceutical composition comprising propofol and albumin that is free of oil.
Using the procedure similar to that described in Example 18, propofol compositions containing albumin and tween 80 were prepared. The aqueous phase was prepare by adding glycerol (2.25% by weight), human serum albumin (0.5% by weight), tween 80 (1.5% by weight) and deferoxamine mesylate (0.1% by weight) into water for injection and stirred untll dissolved. The aqueous phase was passed through a filter (0.2μm filter). Propofol (1% by weight) was added to the aqueous phase and homogized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for 15 cycles at 5° C. Alternately, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2μm filter) and stored under nitrogen. The resulting pamaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5; human serum albumin 0.5-3%; tween 80 0.1-1.5%; deferoxamine mesylate 0.0001-0.1%; glycerol 225%; water for injection q.s. to 100; pH 5-8.
This example demonstes the preparation of a phamnaceutical composition comprising propofol, albunn, and vitamin E-TGS, which is free of oil.
Using the procedure simlar to that described in Example 19, propofol compositions containing albumin and vitamin E-TPGS were prepared. The aqueous phase was prepared by adding glycerol (2.25% by weight), human serum albumnin (0.5% by weight), vitamin E-TPGS (1% by weight) and deferoxamine mesylate (0.1% by weight) into water for injection and was stirred until dissolved. The aqueous phase was passed through a filter (0.2μm filter). Propofol (1% by weight) was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for 15 cycles at 5° C. Alterately, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2μm filter) and stored under nitrogen. The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5; human serum albumin 0.5-3%; vitamin E-TPGS 0.5-4.0%; optionally deferoxamine mesylate 0.0001-0.1%; glycerol 2.25%; water for injection q.s. to 100; pH 5-8.
This example demonstrates the preparation of a pharmaceutical composition comprising propofol, albumin, vitamin E-TPGS, and 1% oil.
An emulsion containig 1% (y weight) of propofol was prepared by the following method. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and stirred until dissolved. The aqueous phase was passed trough a filter (0.2 μm filter). Surfactant, e.g., Vitamin E-TPGS (0.5%), was added to aqueous phase. The oil phase consisted of propofol (1% by weight) and 1% soybean oil. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for up to 15 cycles at 5° C. Alternatively, discrete passes through the homogeniner were used. The final emulsion was filtered (0.2μm filter) and stored under nitrogen.
The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumi 0.01-3%; Vitamin E-TPGS 0.1-2%; soybean or other oil (0.1%-5%); glycerol 2.25%; water for injection q.s. to 100; pH 5-8. Deferoxamine was optionally added (0.001%-0.1% by weight).
This example demonstrates the preparation of a pharmaceutical composition comprising propofol, albumin, vitamin E-TPGS, 1% oil, and a negatively charged component.
An emulsion containing 1% (by weight) of propofol was prepared by the following method. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and was sired until dissolved. The aqueous phase was passed through a filter (0.2 μm filter). Surfactant, e.g., Vitamin E-TPGS (0.5%), was added to aqueous phase. The oil phase consisted of propofol (1% by weight) and 1% soybean oil. A small quantity of negatively charged component (0.001%-1%), e.g., a phospholipid or bile salt was added. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenized at 20,000 psi and recirculated for up to 15 cycles at 5° C. Alternatively, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2μm filter) and stored under nitrogen.
The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumin 0.01-3%; Vitamin E-TPGS 0.1-2%; soybean or other oil (0.1%-5%); glycerol 2.25%; water for injection q.s. to 100; pH 5-8. Deferoxamine was optionally added (0.001%-1% by weight).
This example demonstrates the preparation of a pharmaceutical composition comprising propofol, albumin, vitamin E-TPGS, 1% oil, and a negatively charged component (sodium deoxycholate).
An emulsion containing 1% (by weight) of propofol was prepared by the following method. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and sied until dissolved. The aqueous phase was passed through a filter (0.21 μm filter). Surfactant, e.g., Vitamin E-TPGS (0.5%), was added to aqueous phase. The oil phase consisted of propofol (1% by weight) and 1% soybean oil. A small quantity of negatively charged component (0.001%-1%), e.g., sodium deoxycholate was added. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homog at 20,000 psi and recirculated for up to 15 cycles at 5° C. Alternately, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2 μm filter) and stored under nitrogen.
The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumin 0.01-3%; Vitamin E-TPGS 0.1-2%; soybean or other oil (0.1%-5%); glycerol 2.25%; water for injection q.s. to 100; pH 5-8. Deferoxamine was optionally added (0.001%-0.1% by weight).
This example demonstrates the preparation of a pharmaceutical composition comprising propofol, albumin, vitamin E-TPGS, 1% oil, and a negatively charged component phospholipids, bile salts, polyaminoacids etc).
An emulsion containing 1% by weight) of propofol was prepared as follows. The aqueous phase was prepared by adding glycerol (2.25% by weight) and human serum albumin (0.5% by weight) into water for injection and stirred until dissolved. The aqueous phase was passed through a filter (0.2 μm filter). Surfactant, e.g., Vitamin E-TPGS (0.5%), was added to aqueous phase. The oil phase consisted of propofol (1% by weight) and 1% soybean oil. A small quantity of negatively charged component (0.001%-1%), e.g., phospbatidyl choline was added. The oil phase was added to the aqueous phase and homogenized at 10,000 RPM for 5 min. The crude emulsion was high pressure homogenizd at 20,000 psi and recirculated for up to 15 cycles at 5° C. Alternatively, discrete passes through the homogenizer were used. The final emulsion was filtered (0.2 μm filter) and stored under nitrogen.
The resulting pharmaceutical composition contained the following general ranges of components (weight %): propofol 0.5-5%; human serum albumin 0.01-3%; Vitamin E-TPGS 0.1-2%; soybean or other oil (0.1%5%); glycerol 2.25%; water for injection q.s. to 100; pH 5-8. Deferoxamine was optionally added (0.001%-0.1% by weight).
This example demonstrates the binding of propofol to albumin.
The binding of propofol to albumin was deteried as follows. Solubility of propofol was tested in water and in solutions containing albumin. 2 μL of propofol was added to 10 mL of a water or albumin solution and stirred for 2 hours in a scintillion vial. The solution was then transferred to a 15 mL polyethylene centrifuge tube and kept at 40° C. for about 16 hours. Samples of water and albumin solutions were assayed for propofol. Solubility of propofol in water was determined to be 0.12 mg/ml. Solubifity of propofol in albumin solutions was dependent on the concentration of albumin and increased to 0.44 mg/ml when the albumim concentration was 2% (20 mg/ml). The solutions were ultrafiltered through a 30 kD MWCO filter and the filtrates were assayed for propofol. It was found that for the propofol/water solution, 61% of the propofol could be recovered in the filtrate whereas for the propofol/albumin solution, only 14% was recovered in the filtrate, indicaing a sustanial binding of propofol with albumin. Based on these results, addition of albumin to pharmaceutical compositions comprising propofol result in a decrease in the amoxmt of free propofol due to albumin binding of the propofol.
This example demonstrates the reduction of free propofol in a pharmaceutical composition by filtration/membrane contact.
As observed in the experiments described in Example 28, filtration or ultrfiltration of pharmaceutical compositions comprising propofol results in a reduction in the amount of free propofol. Diprivan and a pharmaceutical composition prepared in accordance with the present invention contaiing albumin, each of which contained 1% propofol (10 mg/ml), were ultrafiltered using a 30 kD membrane. The amount of free propofol was measured in the filtrate using HPLC. The concentration of free propofol in the filtrate was about 17 μg/ml for Diprivan, while the concentration of free propofol in the filtrate was about 7 μg/ml for the inventive pharmaceutical composition. The results corrspond to an effective reduction of free propofol by greater than a factor of 2 for pharmaceutical composition comprising propofol and albumin.
This example demonstrates administrtion of a pharmaceutical composition comprising propofol and albumin to humans.
A randomized, doubleblind clinical trial was conducted to compare adverse skin sensations of a pharmaceutical composition comprsing propofol and albumin with that of a commercially available propofol formulation, Diprivan. Trials were conducted in compliance with Good Clinical Practices and informed consent was taken from the subjects. Adult human subjects of either sex were eligible for participation if they had unbroken, apparently normal skin of dorsal side of their hands.
The formulations originally stored in a refrigerator were brought to room temperature and then 10 μL of the formutons was placed slowly on the back side of both the hands of a subject simultaneously. The overall reaction and feel on their hands for the formulations were noted. The results of this study are set forth in Table 1.
| TABLE 1 |
| |
| |
| % of subjects | % of subjects |
| with ABI-Propofol | with Diprivan |
| sensation | sensation |
| Mild warm | | Mild warm | |
| Order of a test | or stinging | | or stinging | |
| on a subject | or biting | No sensation | or biting | No sensation |
|
| 1st incidence | 0.0 | 100.0 | 75 | 25 |
|
This example demonstrates the use of deferoxamine as antioxidant in a pharmaceutical composition comprising propofol.
Pharmaceutical compositions comprising propofol and deferoxamine mesylate, and containing tween or TPGS were stored at 4°, 25°,or 40° C. to test the effect of deferoxamine mesylate in preventing oxidation of propofol. The concentration of propofol was measured for these formulations over time to determine the antioxidant activity of deferoxamine. The data is reported below in Tables 2 and 3 as % potency relative to time zero.
| TABLE 2 |
|
|
| Albumin/tween formulation |
| CONTROL | 100% | 88% | 48% |
| 0.01% Def | 101% | 89% | 61% |
| 0.1% Def | 103% | 89% | 64% |
| |
| TABLE 3 |
|
|
| Albumin/TPGS formulation |
| CONTROL | 99% | 73% | 42% |
| 0.01% DEF | 99% | 87% | 55% |
| 0.1% DEF | 99% | 85% | 58% |
| |
Under these conditions, deferoxamine was efficient in reducing the level of oxidation of propofol. The effect was more pronounced at higher temperatures. No significant oxidation occurred at 4° C. This study was conducted using stoppers that were not inert or Teflon coated.
This example demonstrates intrapulmonary delivery of a pharmaceutical composition comprising paclitaxel and albumnm (ABI-007).
The purpose of this study was to determine the time course of [3H]ABI-007 in blood and select tissuces following intratracheal instillation to Sprague Dawley rats.
The target volume of the intratacheal dose formulation to be admiistered to the animals was calculated based on a dose volume of 1.5 mL per kg body weight. The dosing apparatus consisted of a Penn-Century microsprayer (Model 1A-1B; Penn-Century, Inc., Philadelphia, Pa.; purchased from DeLong Distributors, Long Branch, N.J.) attached to a 1-mL gas-tight, luer-lock syringe. The appropriate volume of dose preparation was drawn into the dosing apparatus, the filled apparatus was weighed and the weight-recorded. A catheter was placed in the trachea of the anesthetized animal, the microsprayer portion of the dosing apparatus was placed into the trachea through the catheter, and the dose was administered. After dose administration the empty dosing apparatus was reweighed and the administered dose was calculated as the difference in the weights of the dosing apparatus before and after dosing. The average dose for all animals was 4.7738 ±0.0060 (CV 1.5059) mg paclitaxel per kg body weight.
Blood samples of approximately 250 μL were collected from the indwelling jugular cannulas of JVC rats at the following predetmined post-dosing time points: 1, 5, 10, 15, 30, and 45 minutes (min), and 1, 4, 8, and 24 hours (h). The 24-h blood samples, as well as blood samples collected from animals sacrificed at 10 min, 45 min, and 2h, were collected via cardiac punctre from anesthetized rats at sacifice. All blood samples analyzed for total radioactivity were dispensed into pre-weighed sample tubes, and the sample tubes were reweighed, and the weight of each sample was calculated by subtraction. The blood samples collected from the jugular vein as well as the 250-μL aliquots of blood collected from each animal at sacrifice were assayed for total tritium content.
For all rats, the maximum concentration of tritium in blood was observed at 5 min (0.0833 hr) post dosing. The elimination haf-life of tritium, detemined over the time interval ftom 4 h to 24 h, ranged from 19.73 h to 43.02 h. It should be noted that this interval includes only three data points, which may account for the variability in this parameter. The apparent clearance of tritium from blood was on the order of 0.04 L/h. The results of these exeriments are set forth below in Table 4.
| TABLE 4 |
|
|
| Noncompartmental Analysis of Blood Tritium |
| Concentration (mg-eq/L) vs. Time Profiles in Rats |
| After Intratracheal Instillation of [3H]ABI-007 |
| Parameter | Mean +/− SD |
| |
| Cmax(mg-eq/L) | 1.615 +/− 0.279 |
| Tmax(hr) | 0.0833 +/− 0.0 |
| t½beta (hr) | 33.02 +/− 1.99 |
| AUClast (mg-eq × hr/L) | 7.051 +/− 1.535 |
| Cl/F (L/hr) | 0.0442 +/− 0.0070 |
| Fa (Bioavailability) | 1.229 +/− 0.268 |
| |
The mean blood concentration of [3H]ABI-007 -derived radioactivity after an itravenous dose to rats was analyzed as a function of time in order to evaluate the bioavailabilty of tritium derived from an intraacheal dose of [3H]ABI-007. This analysis resulted in a 24-hour AUC (AUClast) of 6.1354 mg-eq □ hr/L. Based on these data, radioactivity derived from the intratracheal dose of [3H]ABI-007 is highly bioavailable. These analyses are based on total radioactivity.
Tritium derived from [3H]ABI-007 is rapidly absorbed after intratracheal instillation. The average absorption and elimination half-lives (k01 half-life and k10 half-life, respectively) for tritium in blood after an intratracheal dose of [3H]ABI-007 (mean +/− SD) were 0.0155+/−0.0058 hr and 4.738+/−0.366 hr, respecfively. The average apparent clearance of tritium from blood was 0.1235+/−0.0180 L/hr (see Table 4 above).
Tritium derived from [3H]ABI007 was absorbed and distributed after intratracheal administaton. The time course of tritium in blood was well described by a two-compartment model, with mean absorption and elimination half-lives of 0.0155 and 4.738 hr, respectively. Approximately 28% of the administered dose was recovered in the lung at 1 min after the intratracheal dose. A maximum of less than 1% of the dose was recovered in other tissues, excluding the gastroitestinal tract, at all time points examined.
Based on results from a previously conducted intravenous dose study with [3]Capxol™, the bioavailability of tritium derived from the intatracheal dose was 1.229±0.268 (mean ±SD) for the three animals in this dose group. It should be noted, however, that this estimate of bioavailability is based on total radioactivity. Surprisingly, paclitaxel delivered by the pulmonary route usig invention compositions with albumin was rapidly bioavailable indicating excellent transport across pulmonary endothelium. No toxicity in the animals was noted, wbich was surpsing since pulmonary delivery of cytotoxics is known to cause lung toxicities.
A fair amount of radioactivity was present in the gastrointestial tract (including contents) at 24 hr post dosing (27% for the intratracheal dose). The presence of tritium in the gastrointestinal tract may be due to biliary excetion or clearance of tritium from the respiratory tract via mucociliary clearance with subsequent swallowing.
This example demonstrates investigation of Aerotech II and Pari nebulizers for pulmonary delivery of pharmaceutical compositions comprsig paclitaxel and albumin.
The study was carried out using the paclitaxel-albumin pharmaceutical composition ABI-007 under the following conditions: room temperature (20-23° C.), relative humidity (48-54%), ambient pressure (629 mmHg), nebulizer flowrate (10 L/min for Aerotech II, 7 L/min for Pari), total flowrate (28.3 L/min), nebulizer pressure drop (23 lb/in2for Aerotech II; 32 lb/in2for Pari), run time (15 to 60 seconds), sample volume (1.5 mL), ABI-007 pacliael concentration (5, 10, 15 and 20 mg/mL).
Both Aerotech II and Pari nebulizers provided acceptable overall efficiency (30%-60%) when ABI-007 was reconstituted at a concentration range of 5-15 mg/mL. The Pari nebulizer efficiency had higher nebulizer efficiency than the Aerotech II nebulizer. The Pari nebulizer efficiency decreased somewhat as ABI-007 concentration increased. Excellent fine particle fraction was observed (74%-96%). The Aerotech II nebulizer had higher fine particle fraction than the Pari nebulizer. The fine particle fraction was independent of concentration.
The Pari nebulizer delivered 100 mg of paclitaxel in less than 30 minutes using a 15 mg/mL solution of ABI-007. The Aerotech II nebulizer delivered 100 mg of paclitaxel in about 65 min using either a 10 mg/mL or 15 mg/mL solution of ABI-007. Performance stability was tested for both Aerotech II and Pari nebultizers. Aerosol concentration and efficiency of both nebulizers were stable until the drug was exhausted At 15 mg/mL, the Pari nebulizer consumed the drug at twice the rate of the Aerotech II nebulizer and produced higher aerosol concentrations than that of the Aerotech II nebulizer.
In conclusion, the nanoparticle/albumin formulation of paclitaxel (ABI-007) shows excellent bioavailility in rats when administered by the pulmonary route. There were no overt signs of early toxicity at the administered dose. Pulmonary delivery of nanoparticle paclitaxel (ABI-007) may be achieved using conventional nebulizers.
This example describes intrapulmonary delivery of a pharmaceutical composition comprising albumin and rapamycin. The purpose of this study was to determine the pulmonary absorption of rapamycin in blood following intratracheal insiluaton to Sprague Dawley rats as compared to intravenous installation.
The target volume of the intratracheal dose formulation that was administered to the animals was calculated based on a dose volume of 1 mL per kg body. The intratracheal dosing apparatus consisted of a Penn-Century microsprayer Model 1A-1B; Penn-Century, Inc., Philadelphia, Pa.; purchased from DeLong Distributors, Long Branch, N.J.) attached to a 1 mL gas-tight, luer-lock syringe. The appropriate volume of dose preparation was drawn into the dosing apparatus, the filled apparatus was weighed and the weight-recorded. A catheter was placed in the trachea of the anesthetized animal, the microsprayer portion of the dosing apparatus was placed into the trachea through the catheter, and the dose was administered. After dose adinishaton the empty dosing apparatus was reweighed and the administered dose was calculated as the difference in the weights of the dosing apparatus before and after dosing.
250 μL samples were collected from the indwelling jugular cannulas of rats at the following predetermined post-dosing time points: 1, 5, 10, 15, 30, and45 minutes (min) and 1, 4, 8, and 24 hours (h). All blood samples analyzed were dispensed into pre-weighed sample tues, and the sample tubes were reweighed, and the weight of each sample was calculted by subtraction. The blood samples collected were assayed for total rapamycin concentration using LC/MS/MS.
Surprisingly, the results showed no significant difference in the blood concentration of rapamycin delivered via pulmonary route versus intravenously. The bioavailability of rapamycin delivered by the pulnonary route using a pharmaceutical composition comprising albumin was calculated to be 109%, indicating excellent transport across pulmonary endothelium.
This example demonstrates tissue distribution of albumin-rapamycin after intrapulmonary administration of a pharmaceutical composition comprising rapamycin and albumin prepared in accordance with the present invention. The purpose of this study was to determine the putnonary absorption of rapamycin in tissue following intratracheal installation to Sprague Dawley rats as compared to intravenous installaion.
The target volume of the intratracheal dose formulation that was administered to the animals was calculated based on a dose volume of 1 mL per kg body. The dosing apparatus consisted of a Penn-Century microsprayer Model 1A-1B; Penn-Century, Inc., Philadelplaa, Pa.; purchased from DeLong Distributors, Long Branch, N.J.) attached to a 1-mL gas-tight, luer-lock syringe. The appropriate volume of dose preparaton was drawn into the dosing apparatus, the filled apparatus was weighed and the weight-recorded. A catheter was placed in the trachea of the anestheied animal, the microsprayer portion of the dosing apparatus was placed into the trachea through the catheter, and the dose was administered. After dose admanstration the empty dosing apparatus was reweighed and the administered dose was calculated as the difference in the weights of the dosing apparatus before and after dosing.
Samples were collected from the brain, lung, and, liver of three rats per group per time point at 10 minutes, 45 minutes, 2 hours, and 24 hours. The samples wee collected and analyzed for total rapamycin concenfaton using LC/MS/MS. The results indicate that rapamycm conoentration is greater in lung tissue when delivered via pulmonary as compared to intravenous delivery. However, the total concentration of rapamycin in the brain is lower when delivered via intratracheal (IT) as compared to intravenous (IV). In the liver, there appears to be no difference in the concentration of rapamycin whether delivered IT or IV. Based on these results, pulnonary delivery of rapamycin may be suitable for the treatment of a condition (i.e., lung plantation), wherein high local concention of rapamycin would be beneficial.
This example demonruates oral delivery of a pharmaceutical composition comprising paclitaxel and albumin (ABI700).
Tritated ABI-007 was utilized to deterniine oral bioavailability of paclitaxel following oral gavage in rats. Following overnight fasting, 5 rats were given 5.5 mg/kg paclitaxel in ABI-007 (Group A) and another 5 rats (Group B) were preteated with cyclosporine (5.0 mg/kg) followed by 5.6 mg/kg paclitaxel in ABI-007. A pharmacokinetic analysis of blood samples drawn at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours was performed after determination of radioactivity in the blood samples by combustion. Oral bioavailability was detennined by comparison with intavenous data previously obtained. The results are set forth below in Table 5.
| TABLE 5 |
|
|
| Mean AUC 0-24, Cmax, Tmaxand % Absorption of |
| 3H-Paclitaxel Derived Radioactivity Following Oral Administration |
| | Dose/Route | AUC0-24 | Absorption | Cmax (mg/kg) | Tmax |
| Group | Treatment | mg/kg | (μg eq × hr/mL) | (%) | (μg × eq/mL) | (hr) |
|
| A | ABI-007 in | 5.5/PO(P) | 2.92 | 44.3 | 0.245 | 1 |
| Normal Saline |
| B | ABI-007 in | 5/PO(C), 5.6/PO(P) | 8.02 | 121.1 | 0.565 | 0.5 |
| Normal Saline with CsA |
|
AUC 0-24 IV (6.06 ,μg×hr./mL) and IV dose (5.1 mg/kg) were used for calculation of percent absorption (data based on IV dose of ABI-007).
An oral bioavailability of 44% was seen for ABI-007 alone. This is dramatically higher than is seen for other formulations of pacitaxel. The bioavailability inreased to 121% when animals were treated with cyclosporine (CsA). This is expected as CsA is a known suppressor of the p-glycoprotin pump that would normally prevent absorption of compounds such as paclitaxel from the GI tract. The greater than 100% bioavailability can be explained by reabsorption following binary excretion of pacitaxel into the GI tract. Other known suppressors or enhancers of absorption may be also utilized for this purpose.
This example demonstrates improved penetration of paclitaxel into red blood cells and tumor cells upon admiisttion of a pharmaceutical composition comprising paclitaxel and albumn.
Human MX-1 breast tumor fragments were implanted subcutaneously in athymic mice. A pharmaceutical composition comprising paclitaxel and albulin (“paclitaxel-albumin”), as described previously, and Taxol were prepared with3H paclitaxel to a specific activity of 25 μCi/mg paclitaxel. 20 mg/kg radiolabeled paclitaxel-albumin or Taxol was administered intravenously in saline when tumor volume reached approximately 500 mm3. Plasm, blood, and tumor tissue were sampled and analyzed for radioactivity at 5, 15, and 30 minutes and at 1, 3, 8, and 24 hours after admiistaion. Tumor pharmacokinetic (AUC and absorption constant) was analyzed using WinNonlin, Pharsight, USA.
Paclitaxel-albumin exhibited rapid partitioning into red blood cells (RBCs) as shown by a rapid drop of the plasma/blood radioactivity ratio to unty after intravenous administration of the drug. Complete partitioning into RBCs occurred as early as 1 hr after administration of paclitaxel-albumin. In contrast, the partitioning of paclitaxel formulated as Taxol into RBCs was much slower and was not completed until more than 8 hrs.
Paclitaxel-albumin exhibited a rapid partitioning into tumor tissue with an absorption constant (Ka) that was 3.3X greater than Taxol. The Kawere 0.43 hr−1and 0.13 hr−1for paclitaxel-albumin and Taxol, respectively. Rapid uptake of paclitaxel resulted in 33% higher tumor AUC for paclitaxel-albumin than for Taxol. The AUC were 3632 nCi*hr/g and 2739 nCi*hr/g for paclitaxel-albumin and Taxol, respectively.
This example demonstrates the safety of a pharmaceutical composition comprising paclitaxel and albumin administed to mice.
Athymnic mice were treated with escalating doses of paclitaxel-albumin or Taxol everyday for 5 consecutive days. Survival was plotted versus dose to determine the LD50. Survival was greatly improved with paclitaxel-albumin versus Taxol (p=0.017, ANOVA). The LD50for paclitaxel-albumin and Taxol were calculated to be 47 mg/kg/day and 30 mg/kg/day for a qld×5 schedule, respectively. At a dose level of 13.4 mg/kg/day, both paclitaxel-albumin and Taxol were well tolerated with mortality of 1% (1 death out of 72 mice) and 4% (2 deatis out of 47 mice), respectively. At a dose level of 20 mg/kg/day, there was 1% mortality for paclitaxel-albumin (1 death out of 72 mice) versus 17% mortality for Taxol (8 deaths out of 47 mice) (p=0.0025). At a dose level of 30 mg/kg/day, there was 4% mortality for paclitaxel-albumin (3 deaths out of 72 mice) versus 49% mortality for Taxol (23 deaths out of 47 mice) (p<0.0001).
This example demonstrates a novel paclitaxel transport mechanism across microvessel endothelial celis (EC) for paclitaxel-albumin compositions.
Nanopartcles and albumin-paclitaxel compositions can accumulate in tumor tissue due to EPR effect resulting from ‘leaky’ vessels in a tumor. An albumin seic gp60 receptor (albondin) transported albumin across EC by transcytosis of the receptors within caveolae at the cell surfice. This transcytosis mechanism allows for the transport of albumin-paclitaxel to the underlying interstitial space. In contrast, cremophor in Taxol inhibited binding of paclitaxel to albumin, greatly reducing paclitaxel transport to the tumor. In addition the gp16 and gp30 receptors also were involved in intracellular transport of modified albumins containing bound paclitaxel, resulting in increased binding of paclitaxel to endothelial cells with a greater anti-angiogenic effect as compared to Taxol.
This example demonstrates an increase in endothelial transcytosis of pharmaceutical compositions comprising paclitaxel and albumin as compared to Taxol.
Human lung microvessel endothelal cells (HLMVEC) were grown to confluence on a transwell. The inventive pharmaceutical composition comprising paclitaxel and albumin, or Taxol containig fluorescent paclitaxel (Flutax) at a concentration of 20 μg/mL, was added to the upper transwell chamber.
The tansport of paclitaxel by transcytosis from the upper chamber to the lower chamber was monitored continuously using a fluorometer. A control containing only Flutax without albumin was also used. The control with Flutax showed no transport, validating the integrity of the confluent HMVEC monolayer. Transport of paclitaxel from the albumin-paclitaxel composition was much faser than paclitaxel from Taxol in the presence of 5% HSA (physiological concentration). Transport rate contstant Ktfor the albumin-paclitaxel composition and Taxol were 1.396 hr−1and 0.03 hr−1, respevely. The total amount of paclitaxel transported across the monolayer was three times higher for the albumin-paclitaxel composition than Taxol.
This example demofltrates improved endothelial cell (EC) binding by pharmaceutical compositions comprising paclitaxel and albumin as compared to Taxol.
Human umbilical vein endothelial cells (HUVEC) were grown on a 96-well microtiter plate. In one experiment, paclitaxel (Flutax- Oregon Green labeled paclitaxel) was reacted with the HUVEC in the presence of increasing concentrations of Cremophor EL/EtOH, which is the vehicle for Taxol. In another experiment, a pharmaceutical composition comprising albumin and Flutax and a Taxol-Flutax composition were reacd to the HUVEC at various final concentrations. Biding of paclitaxel to cells was inhibited by Cremophor. Inhibition was exhibited by an IC50of 0.02% of Creinophor EL/EtOH. This concentration of Cremophor has been shown to persist during Taxol chemotherapy for at least 24 hours. Therefore, it is a relevant process in vivo. At all concentrations tested, a significant amount of paclitaxel from the albumin-paclitaxel composition became bound to cells. In comparison, litle or no binning was observed for Taxol.
This example demonstrates improved albumin binding by phamaceutical compositions comprising paclitaxel and albumin as compared to Taxol.
Human Serum Albumiin (HSA) was immobilized on a plastic ELISA plate. Paclitaxel (Flutax- Oregon Green labeled paclitaxel) was reacted with the immobilized HSA in presence of increasing concentrations of Cremophor EL/EtOH. In another experiment, an albumin-paclitaxel-Flutax composition and a Taxol-Flutax composition were reacted to immobilized HSA at a final concentration of 20 μg paclitaxel/mL. Binding of paclitaxel to albumin was inhibited by Cremophor. hihbition was exhibited by an IC50of 0.003% of Cremophor EL/EtOH. This concentration of Cremophor has been shown to persist during Taxol chemotherapy for at least 24 hours. Therefore, it is a relevant process in vivo. At a relevant pharmacologic paclitaxel concentration (20 μg/mL), a significant amount of paclitaxel from the albumin-paclitaxel composition became bound to immobilized HSA. In comparison, no binding was observed for Taxol.
This example demonstrates increased transfer of paclitaxel to albumin for pharmaceutical compositions comprising paclitaxel and alburmin as compared to Taxol.
Taxol-Flutax and albumin-paclitaxel-Flutax compositions were mixed with either 5% HSA in Hanks buffer or serum, at 20 μg/mL, 40 μg/ml, and 80 μg/ml. The mixtures were immediately separated on a native 3-14% polyacrylamide gel and the amount of paclitaxel bound to albumin was determined by a scaningn fluorometer. The transfer of paclitaxel to HSA was more rapid for the albumin-paclitaxel composition versus Taxol. More paclitaxel co-electeophorsed with HSA when either serum or 5% HSA was incubated with the albumin-paclitaxel-Flutax composition or the Taxol-Flutax composition. Upon exposure to 5% HSA, 45%, 60%, and 33% more paclitaxel tansferred to HSA for the albumin-paclitaxel-Flutax composition than for the Taxol-Flutax composition, at 20 μg/ml, 40 μg/ml, and 80 μg/ml, respectively. Upon exposure to human serum, 121%, 31%, and 83% more paclitaxel transferred to HSA for the albumin-paclitaxel-Flutax composition than for the Taxol-Flutax composition, at 20 μg/ml, 40 μg/ml, and 80 μg/ml, respectively. The Cmaxfor ABI-007 at 260 mg/m2is approximately 20 μg/mL, therefore this is an imporatant process in vivo.
This example demonstrates that the glycoprotein receptor gp60 is responsible for binding and transcytosis of albumin-paclitaxel.
Fluorescent labeled paclitaxel (Flutax) albulmin compositions were contacted with microvessel endothelial cells in culture. Fluorescent staining was observed under a microscope with evidence of punctuate areas that were postulated to be the gp60 receptor binding the albumin-paclitaxel. This was confirmed by using rhodamine labeled albumin which colocalized with the punctuate fluorescence of paclitaxel.
This example demonstrates that increasing amounts of albumin can compete with binding of paclitaxel.
Albumin was immobiliz on a microtiter plate. Fluorescent paclitaxel was added into the wells and the binding of paclitaxel was measured using a scanning fluorometer. Increasing amounts of albumin were added to the wells and the level of inhibiton of paclitaxel binding to immobiize albumin was measured. The data showed that as the amount of albumin added was increased, a corresponding decrease in binding was seen. A similar effect was seen with binding to endothelial cells. This indicated that higher albumin concentration inhibited binding of paclitaxel. Thus invention compositions having lower amounts of albumin are preferred.
This example deinonstrates that lower amounts of albumin in the inventive pharmaceutical composition results in stable compositions.
To investigate if lower amounts of albumin in compositions would affect stability of the inventive pharmaceutical composition, albumin-paclitaxel compositions with low amounts of albunin were prepared, It was found that these compositions were as stable as compositions with higher quantities of albumin when examined for several months at different temperatures (2-8° C., 25° C. and 40° C.) for potency of paclitaxel, impurity formation, particle size, pH and other typical parameters of stability. Thus compositions with lower amounts of albumin are preferred as this can greatly reduce cost as well as allow increased binding and transport to cells.
This example demostrates a pharmaceical composition comprising albumin and paclitaxel having a high albumin to paclitaxel ratio.
30 mg of paclitaxel was dissolved in 3.0 ml methylene chloride. The solution was added to 27.0 ml of humnan serum albumin solution (3% w/v) (corresponding to a ratio of albumin to paclitaxel of 27). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then sferred into a high pressure homogenzer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transfee into a rotary evaporator, and methylene chloride was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was tanslucent, and the typical average diameter of the resulting paclitaxel particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was fbrter lyophilized for 48 hrs. The resulting cake was easily reconstituted to the original dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilizaton.
It should be recognd that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in any way. When compared to toxicity of paclitaxel dissolved in cremophor formulations, the inventive pharmaceutical composition containing albumin showed substantially lower toxicity.
This example demonstrates a pharmaceutical composition comprising albumin and paclitaxel having a low albumin to paclitaxel ratio.
Specifically, 300 mg of paclitaxel was dissolved in 3.0 ml methylene chloride. The solution was added to 27 ml of human serum albumin solution (5% w/v). (corresponding to a ratio of albumin to paclitaxel of 4.5). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transfured into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a rotary evaporator, and methylene chloride was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent, and the typical average diameter of the resulting paclitaxel particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was further lyophilized for 48 hrs. The resulting cake was easily reconstituted to the orgimil dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophiliation.
It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in any way. When compared to toxicity of paclitaxel dissolved in cremophor formulations, the inventive pharmaceutical composition containing albumin showed siustantially lower toxicity.
This example demonstrates a pharmaceutical composition comprising albumin and paclitaxel having an intermediate albumin to paclitaxel ratio.
Specifically, 135 mg of paclitaxel was dissolved in 3.0 ml methylene chloride. The solution was added to 27 ml of human serum albumin solution (5% w/v). Deferoxamine was added as necessary. The mixture was homogenized for 5 minutes at low RPM (Vitris homogenizer, model Tempest I.Q.) in order to form a crude emulsion, and then transferred into a high pressure homogenizer (Avestin). The emulsification was performed at 9000-40,000 psi while recycling the emulsion for at least 5 cycles. The resulting system was transferred into a rotary evaporator, and methylene chloride was rapidly removed at 40° C., at reduced pressure (30 mm Hg) for 20-30 minutes. The resulting dispersion was translucent and the typical average diameter of the resulting paclitaxel particles was in the range 50-220 nm (Z-average, Malvern Zetasizer). The dispersion was fiurter lyophilized for 48 hrs. The resulting cake was easily reconstitrted to the orginal dispersion by addition of sterile water or saline. The particle size after reconstitution was the same as before lyophilization. The calculated ratio (w/w) of albumin to paclitaxel in this invention composition is approximately 10.
It should be recognized that the amounts, types and proportions of drug, solvents, proteins used in this example are not limiting in any way. When compared to toxicity of paclitaxel dissolved in cremophor formulations, the inventive pharmaceutical composition contining albumin showed substantially lower toxicity.
This example demonstrates the treatment of rheumatoid ardaritis in an animal model with an albumin-paclitaxel composition.
The collagen induced arthritis model in the Louvain rat was used to test the therapeutic effect of albumin-paclitaxel composition on arthritis. The paw sizes of the experimental animals were monitored to evaluate the seriousness of arthritis.
After the arthritis was fully developed (usually ˜9-10 days after collagen injection), the experimental animals were divided into different groups to receive either albumin-paclitaxel 1 mg/kg q.o.d, or albumin-paclitaxel 0.5mg/kg +prednisone 0.2 mg/kg q.o.d. (combination treatment) intraperitoneally for 6 doses, then one dose per week for three weeks. The paw sizes were measue at the beginning of treatment (day 0) and every time the drug was injected. One group receved only normal saline as control. By the end of the expeiment, the group receiving albunin-paclitaxel achieved a 42% reduction of paw size, the combination treatment group showed a 33% reduction of the paw size, while the control group had about 20% increase of the paw size relative to the time when the treatment was initiated.
In conclusion, the albumin-paclitaxel compositions demonstrated therapeutic effect on arthritis. The albumin-paclitaxel combinations are likely to localize at sites of arthritic lesions by transport through receptor-mediated mechanisms like gp60.
This example demonstrates the use of albumin-paclitaxel compositions to treat cardiovascular restenosis.
Paclitaxel eluting stents in animals cause incomplete healing and, in some instances, a lack of sustained suppression of neointimal growth in the arteries. The present study tested the efficacy of a novel systemic delivery albumin-paclitaxel invention compositions for reducing in-stent restenosis.
Saline-reconstituted albumin-paclitaxel was tested in 38 New Zealand White rabbits receiving bilateral iliac artery stents. Doses of albumin-paclitaxel (1.0 to 5.0 mg/kg palitaxel dose) were administered as a 10 minute intra-arterial infusion; control animals received vehicle (0.9% normal saline).
In a follow-up chronic experiment, albumin-paclitaxel 5.0 mg/kg was given at stening with or without an intravenous 3.5-mg/kg repeat albumin-paclitaxel dose at 28 days; these studies were terminated at 3 months. At 28 days, mean neointimal thickness was reduced (p<=0.02) by doses of albumin-paclitaxel >=2.5 mg/kg with evidence of delayed healing. The efficacy of a single dose of albumin-paclitaxel 5.0 mg/kg, however, was lost by 90 days. In contrast, a second repeat dose of albumin-paclitaxel 3.5 mg/kg given 28 days after stenting resulted in suppression of neointimal thickness at 90 days (p<=009 versus single dose albumin-paclitaxel 5.0 mg/kg and controls) with nearly complete neointimal healing.
Although systemic albumin-paclitaxel reduces neointimal growth at 28 days, a single repeat dose was required for sustained neointl suppression. Thus, the inventive composition is suitable for treatment of cardiovascular diseases such as restenosis. Inventive compositions comprising pharmaceutical agents other than paclitaxel, for example rapamycin, other taxanes, epothilones etc, are all suitable for treatment of restenosis in blood vessels or artificial blood vessel grafts such as those used for arterio-venous access in patients requiring hemodialysis.