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Recombinant Transforming Growth Factor-Beta
Definition 1
A recombinant therapeutic agent which is chemically identical to or similar to the endogenous cytokine transforming growth factor-beta (TGF-beta) with proapoptotic and antineoplastic properties. TGF-beta may suppress tumor cell growth by decreasing the expression of cyclin D1, a cell cycle regulatory protein, and downregulating the expression of the oncogene c-myc. This agent is also involved in T cell-mediated immunosuppression by CD4+CD25+ T cells, which permits cancer cells to evade immune surveillance. (NCI Thesaurus)
Definition 2
A factor synthesized in a wide variety of tissues. It acts synergistically with TGF-alpha in inducing phenotypic transformation and can also act as a negative autocrine growth factor. TGF-beta has a potential role in embryonal development, cellular differentiation, hormone secretion, and immune function. TGF-beta is found mostly as homodimer forms of separate gene products TGF-beta1, TGF-beta2 or TGF-beta3. Heterodimers composed of TGF-beta1 and 2 (TGF-beta1.2) or of TGF-beta2 and 3 (TGF-beta2.3) have been isolated. The TGF-beta proteins are synthesized as precursor proteins. (NLM, Medical Subject Headings)
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