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*
PharMingen, San Diego, CA 92121;
Immunobiology Section, Yale University School of Medicine, New Haven, CT 06510;
Institute for Gene Therapy and Molecular Medicine, Mount Sinai School of Medicine, New York, NY 10029;
§
Korea National University, Seoul, Republic of Korea; and
¶
Institute of Medical Science, University of Tokyo, Tokyo, Japan
Ligation of CD95 on T lymphocytes resulted in the up-regulation of a cell cycle control protein, p21cip-1/WAF-1, an inhibitor of cyclin-dependent kinases. This up-regulation was completely blocked by the cysteine protease inhibitor Z-VAD-fmk (benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone), whereas DEVD-CHO (succinyl-Asp-Glu-Val-Asp-aldehyde), a caspase 3 inhibitor, had no effect. In Faslpr-cg mice, a point mutation in the death domain of CD95 results in failure to recruit FADD (Fas-associated death domain), and in the present study this mutation prevented both CD95-mediated apoptosis and p21cip-1/WAF-1 induction. During apoptotic cell death due to irradiation, p21cip-1/WAF-1 is up-regulated by a p53-dependent pathway that responds to DNA damage. However, CD95-induced up-regulation of p21cip-1/WAF-1 in T cells was p53-independent. T cells deficient in p21cip-1/WAF-1 were less susceptible to CD95-induced apoptosis. We conclude that in T cells, ligation of CD95 and activation of caspases cause the induction of p21cip-1/WAF-1, which acts to promote cell death.
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