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J. Biol. Chem., Vol. 275, Issue 41, 31733-31738, October 13, 2000
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,
From the Dana-Farber Cancer Institute, Harvard Medical
School, Boston, Massachusetts 02115
The IAP (inhibitor of
apoptosis) family of anti-apoptotic proteins regulates
programmed cell death. Of the six known human IAP-related proteins,
XIAP is the most potent inhibitor. To study the mechanistic effects of
XIAP on DNA damage-induced apoptosis, we prepared U-937 cells that
stably overexpress XIAP. The results demonstrate that XIAP inhibits
apoptosis induced by
1-[
-D-arabinofuranosyl]cytosine (ara-C) and
other genotoxic agents. XIAP had no detectable effect on ara-C-induced
release of mitochondrial cytochrome c and attenuated cleavage of procaspase-9. In addition, we show that ara-C induces the
association of XIAP with the cleaved fragments of caspase-9 and thereby
inhibition of caspase-9 activity. The results also demonstrate that
ara-C induces cleavage of procaspase-3 by a caspase-8-dependent mechanism and that XIAP inhibits caspase-3 activity. These results demonstrate that XIAP functions downstream of procaspase-9 cleavage as
an inhibitor of both proteolytically processed caspase-9 and -3 in the
cellular response to genotoxic stress.
To whom correspondence should be addressed. Tel.: 617-632-2939;
Fax: 617-632-2933; E-mail: Rakesh_Datta@dfci.harvard.edu.
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