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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
The recruitment of Fas-associated death domain/caspase-8 in Ras-induced apoptosis.
Oncogenic Ras induces cells to undergo apoptosis after inhibition of protein kinase C (PKC) activity. The integration of differential signaling pathways is required for full execution of apoptosis. In this study, we used Jurkat as well as Fas/FADD-defective cell lines expressing v-ras to determine the upstream elements required for activation of the caspase cascade in PKC/Ras-mediated apoptosis. During this Ras-induced apoptotic process, caspase-8 was activated, possibly through its binding to Fas-associated death domain (FADD), in Jurkat/ras and Jurkat/Fas(m)/ras cells but not in Jurkat/FADD(m)/ras cells. c-Jun NH(2)-terminal kinase (JNK) was activated in all three cell lines expressing ras in response to apoptotic stimulation. Suppression of JNK by dn-JNK1 blocked the interaction of FADD and caspase-8 and partially protected Jurkat/ras and Jurkat/Fas(m)/ras cells from apoptosis. However, dn-JNK1 had no effect on PKC/Ras-induced apoptosis in Jurkat/FADD(m)/ras cells. The results indicate that FADD/caspase-8 signaling is involved in PKC/Ras-mediated apoptosis, and JNK may be an upstream effector of caspase activation.
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