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Originally published In Press as doi:10.1074/jbc.C100107200 on March 23, 2001

J. Biol. Chem., Vol. 276, Issue 19, 16059-16063, May 11, 2001
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The Small Heat Shock Protein alpha B-Crystallin Negatively Regulates Cytochrome c- and Caspase-8-dependent Activation of Caspase-3 by Inhibiting Its Autoproteolytic Maturation*

Merideth C. Kamradt, Feng Chen, and Vincent L. CrynsDagger

From the Robert H. Lurie Comprehensive Cancer Center and the Department of Medicine, Northwestern University Medical School, Chicago, Illinois 60611

Caspases are universal effectors of apoptosis. The mitochondrial and death receptor pathways activate distinct apical caspases (caspase-9 and -8, respectively) that converge on the proteolytic activation of the downstream executioner caspase-3. Caspase-9 and -8 cleave procaspase-3 to produce a p24 processing intermediate (composed of its prodomain and large subunit), which then undergoes autoproteolytic cleavage to remove the prodomain from the active protease. Recently, several heat shock proteins have been shown to selectively inhibit the mitochondrial apoptotic pathway by disrupting the activation of caspase-9 downstream of cytochrome c release. We report here that the small heat shock protein alpha B-crystallin inhibits both the mitochondrial and death receptor pathways. In S-100 cytosolic extracts treated with cytochrome c/dATP or caspase-8, alpha B-crystallin inhibits the autoproteolytic maturation of the p24 partially processed caspase-3 intermediate. In contrast, neither the closely related small heat shock protein family member Hsp27 nor Hsp70 inhibited the maturation of the p24 intermediate. We also demonstrate that alpha B-crystallin co-immunoprecipitates with the p24 partially processed caspase-3 in vivo. Taken together, our results demonstrate that alpha B-crystallin is a novel negative regulator of apoptosis that acts distally in the conserved cell death machinery by inhibiting the autocatalytic maturation of caspase-3.


* This work was supported in part by a grant from the Muscular Dystrophy Association (to V. L. C.), by National Institutes of Health Grants NS31957 (to V. L. C.) and 5T32-CA70085 (to M. C. K.), by institutional research grants to Northwestern University from the Howard Hughes Medical Institute (to V. L. C.), and by the Elizabeth Boughton Trust (to V. L. C.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Division of Endocrinology, Tarry 15-755, Northwestern University Medical School, 303 E. Chicago Ave., Chicago, IL 60611. Tel.: 312-503-0644; Fax: 312-908-9032; E-mail: v-cryns@northwestern.edu.


Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.
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