Journal
CELL DEATH AND DIFFERENTIATION
Volume 12, Issue 3, Pages 224-232Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.cdd.4401558
Keywords
Mcl-1; PKC-delta; UV radiation; keratinocytes; apoptosis
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Funding
- NCI NIH HHS [CA83784] Funding Source: Medline
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Keratinocyte apoptosis induced by UV radiation is a major protective mechanism from skin photocarcinogenesis. The induction of apoptosis by UV radiation, as well as a variety of genotoxic stimuli, involves the activation of PKC-delta by caspase-3-mediated cleavage in its hinge region, thus generating a constitutively active catalytic fragment. To determine the role of PKC-delta cleavage in UV apoptosis signaling, we introduced a caspase-resistant PKC-delta mutant (D330A) into human keratinocytes by retrovirus transduction. Overexpression of PKC-delta( D330A) protected keratinocytes from UV-induced apoptosis and enhanced long-term survival. PKC-delta( D330A) partially prevented the release of cytochrome c from the mitochondria and the loss of Mcl-1, a key antiapoptotic protein downregulated during UV apoptosis. Thus, the cleavage and activation of PKC-delta are critical components of UV-induced apoptosis in human keratinocytes, and the inactivation of PKC-delta can promote the survival of keratinocytes exposed to UV radiation.
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