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Transforming growth factor beta1 (TGF-β1) belongs to a family of polypeptide factors, whose cytostatic and apoptotic functions help restrain the growth of mammalian cells. Although solid data established the role of TGF-β's as suppressor factors in tumorigenic processes, in the context of an advanced stage of disease, TGF-β's could also play a pro-oncogenic role. We have previously shown that TGF-β1 induces both pro-and antiapoptotic signals in foetal rat hepatocytes. In this work, we have focused on its antiapoptotic mechanism. We show that TGF-β1 activates the epidermal growth factor receptor (EGFR) and phosphorylates c-Src. EGFR is required for Akt activation. Blocking EGFR signalling amplifies the apoptotic response to TGF-β1. TGF-β1 induced a rapid activation of the tumour necrosis factor-α-converting enzyme (TACE/ADAM (a disintegrin and metalloprotease) 17). Inhibitors of TACE considerably …