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Originally published In Press as doi:10.1074/jbc.M201770200 on July 24, 2002

J. Biol. Chem., Vol. 277, Issue 41, 38731-38736, October 11, 2002
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The Small Heat Shock Protein alpha B-crystallin Negatively Regulates Apoptosis during Myogenic Differentiation by Inhibiting Caspase-3 Activation*

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

From the Center for Endocrinology, Metabolism, and Molecular Medicine, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611

Myoblasts respond to growth factor deprivation either by differentiating into multinucleated myotubes or by undergoing apoptosis; hence, the acquisition of apoptosis resistance by myogenic precursors is essential for their development. Here we demonstrate that the expression of the small heat shock protein alpha B-crystallin is selectively induced in C2C12 myoblasts that are resistant to differentiation-induced apoptosis, and we show that this induction occurs at an early stage in their differentiation in vitro. In contrast, the expression of several known anti-apoptotic proteins (FLIP, XIAP, Bcl-xL) was not altered during myogenesis. We also demonstrate that ectopic expression of alpha B-crystallin, but not the closely related small heat shock protein Hsp27, renders C2C12 myoblasts resistant to differentiation-induced apoptosis. Furthermore, we show that the myopathy-causing R120G alpha B-crystallin mutant is partly impaired in its cytoprotective function, whereas a pseudophosphorylation alpha B-crystallin mutant that mimics stress-induced phosphorylation is completely devoid of anti-apoptotic activity. Finally, we demonstrate that alpha B-crystallin negatively regulates apoptosis during myogenesis by inhibiting the proteolytic activation of caspase-3, whereas the R120G and pseudophosphorylation mutants are defective in this function. Taken together, our findings indicate that alpha B-crystallin is a novel negative regulator of myogenic apoptosis that directly links the differentiation program to apoptosis resistance.

* 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, Feinberg School of Medicine, Northwestern University, 303 East Chicago Ave., Chicago, IL 60611. Tel.: 312-503-0644; Fax: 312-908-9032; E-mail: v-cryns@northwestern.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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