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J Biol Chem, Vol. 274, Issue 22, 15320-15328, May 28, 1999

Selective Inhibition of Protein Kinase C Isozymes by Fas Ligation

Chang-Yan Chen and Douglas V. Faller

From the Cancer Research Center and Departments of Medicine, Biochemistry, Pediatrics, Microbiology, Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, Massachusetts 02118

Activation of protein kinase C (PKC) can protect cells from apoptosis induced by various agents, including Fas ligation. To elucidate a possible interaction between Fas-mediated apoptotic signals and activation-related protective signals, we investigated the impact of Fas ligation on PKC activity. We demonstrate that engagement of Fas on human lymphoid Jurkat cells triggered apoptosis, and Fas ligation resulted in partial blockade of cellular PKC activity. The phorbol 12-myristate 13-acetate-mediated translocation of PKCtheta from the cytoplasm to the membrane was inhibited by treatment with anti-Fas antibody, whereas the translocation of PKCalpha or epsilon  was not affected. In vitro kinase assay of PKCalpha or epsilon  phosphotransferase activity demonstrated that Fas ligation inhibited the ability of PKCalpha to phosphorylate histone H1 as substrate but did not inhibit epsilon  isozyme activity. This inhibition of PKCalpha activity mediated by Fas ligation was reversed by okadaic acid, a phosphatase inhibitor, suggesting the involvement of a member of the protein phosphatase 2A subfamily in this component of Fas signaling. Identical patterns of PKC isozyme inhibition were obtained using mouse thymoma cells overexpressing the fas gene (LF(+)). These results suggest that the selective inhibition of a potentially protective, PKC-mediated pathway by Fas activation may, to some extent, contribute to Fas-induced apoptotic signaling.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.


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