TGF-β is a multifunctional set of peptides that controlsproliferation,differentiation, and other functions in many cell types. TGF-β acts synergistically withtransforming growth factor-alpha (TGF-α) in inducingtransformation. It also acts as a negativeautocrinegrowth factor. Dysregulation of TGF-β activation and signaling may result inapoptosis. Many cells synthesize TGF-β and almost all of them have specific receptors for this peptide. TGF-β1,TGF-β2, andTGF-β3 all function through the same receptor signaling systems.[7]
TGF-β1 plays an important role in controlling theimmune system, and shows different activities on different types of cell, or cells at different developmental stages. Most immune cells (orleukocytes) secrete TGF-β1.[11]
The effects of TGF-β1 onmacrophages andmonocytes are predominantly suppressive; this cytokine can inhibit the proliferation of these cells and prevent their production of reactive oxygen (e.g.superoxide (O2−)) and nitrogen (e.g.nitric oxide (NO)) intermediates. However, as with other cell types, TGF-β1 can also have the opposite effect on cells of myeloid origin. For example, TGF-β1 acts as achemoattractant, directing an immune response to certainpathogens. Likewise, macrophages and monocytes respond to low levels of TGF-β1 in a chemotactic manner. Furthermore, the expression of monocytic cytokines (such asinterleukin(IL)-1α, IL-1β, andTNF-α),[15] and macrophage'sphagocytic can be increased by the action of TGF-β1.[11]
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