VGF orVGF nerve growth factor inducible is a secreted protein andneuropeptide precursor that may play a role in regulating energy homeostasis,metabolism[5] andsynaptic plasticity.[6] The protein was first discovered in 1985 by Leviet al.[7] in an experiment withPC12 cells and its name is non-acronymic. VGF gene encodes a precursor which is divided byproteolysis topolypeptides of different mass, which have a variety of functions, the best studied of which are the roles ofTLQP-21 in the control of appetite and inflammation,[8][9][10][11][12][13][14][15] andTLQP-62 as well as AQEE-30 in regulating depression-like behaviors[16][17][18][19][20] and memory.[21][22] The expression of VGF and VGF-derived peptides is detected in a subset of neurons in the central and peripheral nervous systems and specific populations of endocrine cells in theadenohypophysis,adrenal medulla, gastrointestinal tract, andpancreas.[23] VGF expression is induced byNGF,CREB andBDNF and regulated byneurotrophin-3.[24]Physical exercise significantly increases VGF expression in micehippocampal tissue and upregulates a neurotrophic signaling cascade thought to underlie the action ofantidepressants.[16][25][26][27]
Changes in expression of discrete VGF fragments have been detected in different neurological and psychiatric conditions. Inschizophrenia, one study has shown an increase in the VGF23-62 peptide[28] and a subsequent small study demonstrated that drugs further increase the expression, pointing at a possible ameliorating action of the fragment. A decreased expression of VGF26-62 peptide was found infrontotemporal dementia[29] and the expression of a fragment containing aminoacids 378-398 was found to be changing inamyotrophic lateral sclerosis[30] andAlzheimer's disease.[31] VGF expression has also been shown in damaged peripheral nerves, and it is thought to have a role inneuropathic pain.[32] Inglioblastoma, VGF has been shown to play autocrine and paracrine roles in feedback loops between differentiated glioblastoma cells and glioblastoma-specificcancer stem cells, promoting growth, survival and self-renewal.[33]
^Rizzi R, Bartolomucci A, Moles A, D'Amato F, Sacerdote P, Levi A, La Corte G, Ciotti MT, Possenti R, Pavone F (August 2008). "The VGF-derived peptide TLQP-21: a new modulatory peptide for inflammatory pain".Neuroscience Letters.441 (1):129–33.doi:10.1016/j.neulet.2008.06.018.PMID18586396.S2CID207127085.
^Bartolomucci A, Moles A, Levi A, Possenti R (September 2008). "Pathophysiological role of TLQP-21: gastrointestinal and metabolic functions".Eating and Weight Disorders.13 (3): e49-54.PMID19011364.
^Jethwa PH, Ebling FJ (2008). "Role of VGF-derived peptides in the control of food intake, body weight and reproduction".Neuroendocrinology.88 (2):80–7.doi:10.1159/000127319.PMID18408361.S2CID207626224.
^Rüetschi U, Zetterberg H, Podust VN, Gottfries J, Li S, Hviid Simonsen A, McGuire J, Karlsson M, Rymo L, Davies H, Minthon L, Blennow K (December 2005). "Identification of CSF biomarkers for frontotemporal dementia using SELDI-TOF".Experimental Neurology.196 (2):273–81.doi:10.1016/j.expneurol.2005.08.002.PMID16154129.S2CID23401973.
^Carrette O, Demalte I, Scherl A, Yalkinoglu O, Corthals G, Burkhard P, Hochstrasser DF, Sanchez JC (August 2003). "A panel of cerebrospinal fluid potential biomarkers for the diagnosis of Alzheimer's disease".Proteomics.3 (8):1486–94.doi:10.1002/pmic.200300470.PMID12923774.S2CID25445068.
