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Mol. Cell. Biol., Jan 1998, 608-615, Vol 18, No. 1
CS Duckett, F Li, Y Wang, KJ Tomaselli, CB Thompson and RC Armstrong
The gene encoding human IAP-like protein (hILP) is one of several mammalian
genes with sequence homology to the baculovirus inhibitor-of- apoptosis
protein (iap) genes. Here we show that hILP can block apoptosis induced by
a variety of extracellular stimuli, including UV light, chemotoxic drugs,
and activation of the tumor necrosis factor and Fas receptors. hILP also
protected against cell death induced by members of the caspase family,
cysteine proteases which are thought to be the principal effectors of
apoptosis. hILP and Bcl-xL were compared for their ability to affect
several steps in the apoptotic pathway. Redistribution of cytochrome c from
mitochondria, an early event in apoptosis, was not blocked by
overexpression of hILP but was inhibited by Bcl-xL. In contrast, hILP, but
not Bcl-xL, inhibited apoptosis induced by microinjection of cytochrome c.
These data suggest that while Bcl-xL may control mitochondrial integrity,
hILP can function downstream of mitochondrial events to inhibit apoptosis.
Copyright © 1998, American Society for Microbiology
Human IAP-like protein regulates programmed cell death downstream of Bcl-xL and cytochrome c
Howard Hughes Medical Institute, and Department of Medicine, The University of Chicago, Illinois 60637, USA.
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