Protein kinase PKC delta and c-Abl are required for mitochondrial apoptosis induction by genotoxic stress in the absence of p53, p73 and Fas receptor

FEBS Letters
Malika LasferFlorence Reyl-Desmars

Abstract

Doxorubicin, cis-diamminedichloroplatinum (II) and 5-fluorouracil used in chemotherapy induce apoptosis in Hep3B cells in the absence of p53, p73, and functional Fas. Since mediators remain unknown, the requirement of PKC delta (PKCdelta) and c-Abl was investigated. Suppression of c-Abl or PKCdelta expression using SiRNAs impaired PARP cleavage, Gleevec and/or rottlerin inhibited the induction of the subG1 phase and the increase of reactive oxygen species level. Co-precipitations and phosphorylations to mitochondria of c-Abl, PKCdelta and Bcl-X(L/s) were induced. A depolarization of the mitochondrial membrane and activations of caspase-2 and -9 were observed. We propose that, in the absence of p53, p73 and Fas, genotoxic drugs could require both PKCdelta and c-Abl to induce apoptosis through the mitochondrial pathway.

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Citations

Aug 25, 2012·Archivum Immunologiae Et Therapiae Experimentalis·Meng ZhaoGuo-Qiang Chen
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