Transforming growth factor‐β: The breaking open of a black box

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Abstract
Transforming growth factor‐β (TGF‐β) and its related proteins regulate broad aspects of body development, including cell proliferation, differentiation, apoptosis and gene expression, in various organisms. Deregulated TGF‐β function has been causally implicated in the generation of human fibrotic disorders and in tumor progression. Nevertheless, the molecular mechanisms of TGF‐β action remained essentially unknown until recently. Here, we discuss recent progress in our understanding of the mechanism of TGF‐β signal transduction with respect to the regulation of gene expression, the control of cell phenotype and the potential usage TGF‐β for the treatment of human diseases.