Nat Cell Biol. 2002 Jan;4(1):51-8.

TGF-beta induces apoptosis through Smad-mediated expression of DAP-kinase.

Jang CW, Chen CH, Chen CC, Chen JY, Su YH, Chen RH.

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Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei 100, Taiwan.

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Nat Cell Biol 2002 Apr;4(4):328.

Abstract

Transforming growth factor-beta (TGF-beta) and TGF-beta-related factors induce apoptosis in a variety of tissues; however, the mechanism underlying this induction is largely unknown. Here, we demonstrate that TGF-beta induces the expression of the death-associated protein kinase (DAP-kinase) as an immediate early response in cells that undergo apoptosis in response to TGF-beta. DAP-kinase is a positive mediator of apoptosis induced by certain cytokines and oncogenes. We show that the DAP-kinase promoter is activated by TGF-beta through the action of Smad2, Smad3 and Smad4. Overexpression of DAP-kinase triggers apoptosis in the absence of TGF-beta, whereas inhibition of DAP-kinase activity protects cells from TGF-beta-induced apoptosis, blocks TGF-beta-induced release of cytochrome c from mitochondria and prevents TGF-beta-induced dissipation of the mitochondrial membrane potential. Our findings indicate that DAP-kinase mediates TGF-beta-dependent apoptosis by linking Smads to mitochondrial-based pro-apoptotic events.

PMID:: 11740493; [PubMed - indexed for MEDLINE]

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