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Molecular and Cellular Biology, February 2002, p. 816-834, Vol. 22, No. 3
0270-7306/01/$04.00+0     DOI: 10.1128/MCB.22.3.816-834.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Hsp27 as a Negative Regulator of Cytochrome c Release

Catherine Paul, Florence Manero, Sandrine Gonin, Carole Kretz-Remy, Sophie Virot, and André-Patrick Arrigo*

Centre de Génétique Moléculaire et Cellulaire, CNRS-UMR-5534, Université Claude Bernard Lyon I, F-69622 Villeurbanne, France

Received 12 March 2001/ Returned for modification 18 April 2001/ Accepted 29 October 2001

We previously showed that Hsp27 protects against apoptosis through its interaction with cytosolic cytochrome c. We have revisited this protective activity in murine cell lines expressing different levels of Hsp27. We report that Hsp27 also interferes, in a manner dependent on level of expression, with the release of cytochrome c from mitochondria. Moreover, a decreased level of endogenous Hsp27, which sensitized HeLa cells to apoptosis, reduced the delay required for cytochrome c release and procaspase 3 activation. The molecular mechanism regulating this function of Hsp27 is unknown. In our cell systems, Hsp27 is mainly cytosolic and only a small fraction of this protein colocalized with mitochondria. Moreover, we show that only a very small fraction of cytochrome c interacts with Hsp27, hence excluding a role of this interaction in the retention of cytochrome c in mitochondria. We also report that Bid intracellular relocalization was altered by changes in Hsp27 level of expression, suggesting that Hsp27 interferes with apoptotic signals upstream of mitochondria. We therefore investigated if the ability of Hsp27 to act as an expression-dependent modulator of F-actin microfilaments integrity was linked to the retention of cytochrome c in mitochondria. We show here that the F-actin depolymerizing agent cytochalasin D rapidly induced the release of cytochrome c from mitochondria and caspase activation. This phenomenon was delayed in cells pretreated with the F-actin stabilizer phalloidin and in cells expressing a high level of Hsp27. This suggests the existence of an apoptotic signaling pathway linking cytoskeleton damages to mitochondria. This pathway, which induces Bid intracellular redistribution, is negatively regulated by the ability of Hsp27 to protect F-actin network integrity. However, this upstream pathway is probably not the only one to be regulated by Hsp27 since, in staurosporine-treated cells, phalloidin only partially inhibited cytochrome c release and caspase activation. Moreover, in etoposide-treated cells, Hsp27 still delayed the release of cytochrome c from mitochondria and Bid intracellular redistribution in conditions where F-actin was not altered.

* Corresponding author. Mailing address: Centre de Génétique Moléculaire et Cellulaire, CNRS-UMR-5534, Université Claude Bernard Lyon I, 16 rue Dubois, Bat. Gregor Mendel, F-69622 Villeurbanne, France. Phone: 33 (0) 472448595. Fax: 33 (0) 472440555. E-mail: arrigo{at}univ-lyon1.fr.

Molecular and Cellular Biology, February 2002, p. 816-834, Vol. 22, No. 3
0022-538X/01/$04.00+0     DOI: 10.1128/MCB.22.3.816-834.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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