Infection of glioma cells with Sindbis virus induces selective activation and tyrosine phosphorylation of protein kinase C delta. Implications for Sindbis virus-induced apoptosis

The Journal of Biological Chemistry
Avi ZrachiaC Brodie

Abstract

Sindbis virus (SV) is an alpha virus used as a model for studying the role of apoptosis in virus infection. In this study, we examined the role of protein kinase C (PKC) in the apoptosis induced by SVNI, a virulent strain of SV. Infection of C6 cells with SVNI induced a selective translocation of PKCdelta to the endoplasmic reticulum and its tyrosine phosphorylation. The specific PKCdelta inhibitor rottlerin and a PKCdelta kinase-dead mutant increased the apoptosis induced by SVNI. To examine the role of the tyrosine phosphorylation of PKCdelta in the apoptosis induced by SVNI we used a PKCdelta mutant in which five tyrosine residues were mutated to phenylalanine (PKCdelta5). PKCdelta5-overexpressing cells exhibited increased apoptosis in response to SVNI as compared with control cells and to cells overexpressing PKCdelta. SVNI also increased the cleavage of caspase 3 in cells overexpressing PKCdelta5 but did not induce cleavage of PKCdelta or PKCdelta5. Using single tyrosine mutants, we identified tyrosines 52, 64, and 155 as the phosphorylation sites associated with the apoptosis induced by SVNI. We conclude that PKCdelta exerts an inhibitory effect on the apoptosis induced by SV and that phosphorylation of PKCdelta on specif...Continue Reading

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