期刊
INTERNATIONAL JOURNAL OF CANCER
卷 93, 期 2, 页码 185-191出版社
WILEY-LISS
DOI: 10.1002/ijc.1316
关键词
apoptosis; ASK1; CD95 receptor; DISC; JNK
类别
Here we investigated CD95-mediated JNK activation pathways and their physiological relevance by employing a variety of cell lines with deficiencies in individual signal transmitting proteins. JNK activation was completely dependent on the activation of caspases in type I and type II cells, as revealed by the inhibitory effects of the caspase inhibitors zVAD-fmk or the cowpoxvirus-encoded CrmA protein. Jurkat cells deficient in caspase-8 or expressing a dominant negative (DN) form of FADD were unable to induce JNK in response to CD95 ligation, indicating that these death-inducing signaling complex (DISC) proteins are required for signal transmission, Activation of caspases, JNK and apoptosis occurred with a markedly slower kinetics in cells expressing a DN version of ASK1, revealing an important contribution of ASK1 for these processes, A C-terminally truncated version of Daxx impaired CD95-mediated apoptosis without affecting the INK signal. DN forms of FADD, MKK4 and MKK7 completely inhibited CD95-mediated INK activation but remained without impact on cell killing, indicating that JNK activation is not required for the execution process of CD95-mediated cell killing. (C) 2001 Wiley-Liss, Inc.
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