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Negative regulation of the Apaf-1 apoptosome by Hsp70


Release of cytochrome c from mitochondria by apoptotic signals induces ATP/dATP-dependent formation of the oligomeric Apaf-1–caspase-9 apoptosome. Here we show that the documented anti-apoptotic effect of the principal heat-shock protein, Hsp70, is mediated through its direct association with the caspase-recruitment domain (CARD) of Apaf-1 and through inhibition of apoptosome formation. The interaction between Hsp70 and Apaf-1 prevents oligomerization of Apaf-1 and association of Apaf-1 with procaspase-9. On the basis of these results, we propose that resistance to apoptosis exhibited by stressed cells and some tumours, which constitutively express high levels of Hsp70, may be due in part to modulation of Apaf-1 function by Hsp70.

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Figure 1: Inducible Hsp70 associates with Apaf-1.
Figure 2: Hsp70 prevents processing of procaspase-9 in an ATP-dependent manner.
Figure 3: Overexpression of Hsp70 inhibits cytochrome c/ATP-mediated activation of caspase-3 and apoptosis.
Figure 4: Hsp70 inhibits formation of the Apaf-1 apoptosome in cell-free extracts.
Figure 5: Hsp70 inhibits oligomerization of Apaf-1L and Apaf-1–procaspase-9 interaction.
Figure 6: Hsp70 associates with the CARD of monomeric Apaf-1 and modulates the CARD–CARD interaction between Apaf-1 and procaspase-9.


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We thank the members of Robbins’ laboratory, especially M. Serrano, B. Baldwin, T. Kenniston and J. Mai, for technical support. We also thank Y. Lazebnik and S. H. Kaufmann for Apaf-1 and caspase-9 antibodies, respectively, and R. Morimoto for hsp70 cDNA. This work was supported by NIH grants AG14357 and AG13487 (to E.S.A.) and CA55227 (to P.D.R.).

Correspondence and requests for materials should be addressed to E.S.A.

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Saleh, A., Srinivasula, S., Balkir, L. et al. Negative regulation of the Apaf-1 apoptosome by Hsp70. Nat Cell Biol 2, 476–483 (2000).

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