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Pubmed ID :12377781
Publication Date : //

Activation of SAPK/JNK signaling by protein kinase Cdelta in response to DNA damage.


The cellular response to genotoxic stress includes activation of protein kinase Cdelta (PKCdelta). The functional role of PKCdelta in the DNA damage response is unknown. The present studies demonstrate that PKCdelta is required in part for induction of the stress-activated protein kinase (SAPK/JNK) in cells treated with 1-beta-d-arabinofuranosylcytosine (araC) and other genotoxic agents. DNA damage-induced SAPK activation was attenuated by (i) treatment with rottlerin, (ii) expression of a kinase-inactive PKCdelta(K-R) mutant, and (iii) down-regulation of PKCdelta by small interfering RNA (siRNA). Coexpression studies demonstrate that PKCdelta activates SAPK by an MKK7-dependent, SEK1-independent mechanism. Previous work has shown that the nuclear Lyn tyrosine kinase activates the MEKK1 --> MKK7 --> SAPK pathway but not through a direct interaction with MEKK1. The present results extend those observations by demonstrating that Lyn activates PKCdelta, and in turn, MEKK1 is activated by a PKCdelta-dependent mechanism. These findings indicate that PKCdelta functions in the activation of SAPK through a Lyn --> PKCdelta --> MEKK1 --> MKK7 --> SAPK signaling cascade in response to DNA damage.

Authors : Yoshida Kiyotsugu , Miki Yoshio , Kufe Donald ,

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