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by an ICE/CED
3-like Protease Induces Characteristics of Apoptosis
By






From * BASF Bioresearch Corporation, Worcester, Massachusetts 01605; and Recent studies have shown that protein kinase C (PKC)
Division of Cancer
Pharmacology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115
is proteolytically activated at the onset of apoptosis induced by DNA-damaging agents, tumor necrosis factor, and anti-Fas antibody. However, the relationship of PKC
cleavage to induction of apoptosis is unknown. The
present studies demonstrate that full-length PKC
is cleaved at DMQD330N to a catalytically
active fragment by the cysteine protease CPP32. The results also demonstrate that overexpression of the catalytic kinase fragment in cells is associated with chromatin condensation, nuclear
fragmentation, induction of sub-G1 phase DNA and lethality. By contrast, overexpression of
full-length PKC
or a kinase inactive PKC
fragment had no detectable effect. The findings
suggest that proteolytic activation of PKC
by a CPP32-like protease contributes to phenotypic changes associated with apoptosis.
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