Abstract
The induction of apoptosis by the Fas/APO-1 receptor is important for T- cell-mediated cytotoxicity and down-regulation of immune responses. Binding of Fas ligand to the Fas/APO-1 receptor transduces an apoptotic signal that requires activation of interleukin 1β-converting enzyme (ICE) and CPP32β, members of a family of cysteine proteases that are evolutionarily conserved determinants of cell death. We report here that Fas/APO-1-triggered apoptosis involves ICE-mediated activation of p34(cdc2) kinase. Ligation of the Fas receptor resulted in the rapid stimulation of ICE proteolytic activity and activation of p34(cdc2) kinase. Specific tetrapeptide inhibitors of ICE (Acetyl-Tyr-Val-Ala-Asp-chloromethylketone) or CPP32β (Acetyl-Asp-Glu-Val- Asp-aldehyde) prevented the anti-Fas antibody-mediated activation of p34(cdc2) and inhibited apoptosis. Inhibition of p34(cdc2) activity by transient overexpression of a dominant-negative cdc2 construct or human WEE1 kinase inhibited Fas-mediated apoptosis. These results suggest that activation of p34(cdc2) kinase is a critical determinant of cell death mediated by Fas and ICE family proteases.
Original language | English (US) |
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Pages (from-to) | 4551-4555 |
Number of pages | 5 |
Journal | Cancer Research |
Volume | 56 |
Issue number | 20 |
State | Published - Oct 15 1996 |
Externally published | Yes |
ASJC Scopus subject areas
- Oncology
- Cancer Research