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Apoptosis plays a role in cardiomyocyte death in several cardiovascular disorders. Here, we show that primary postnatal cardiomyocytes did not die upon activation of the intrinsic (cytochrome c-dependent) apoptotic pathway. Release of cytochrome c from mitochondria to the cytosol occurred, but did not activate the effector phase of apoptosis. Myocardial cells did not express apoptotic protease-activating factor-1 (Apaf-1), the allosteric activator of caspase-9 acting downstream of cytochrome c release. Forced expression of Apaf-1 restored the competence to complete the cytochrome c-induced apoptotic program and this effect was prevented by overexpression of Bcl-XL. However, cardiomyocytes were able to enter the apoptotic program when it was initiated by activation of death receptors, as observed during serum deprivation and metabolic inhibition. Our results indicate that regulation of Apaf-1 expression may be a new regulatory mechanism developed in postmitotic cells in order to prevent irreversible commitment to die after release of cytochrome c.Cell Death and Differentiation (2003) 10, 977-986. doi:10.1038/sj.cdd.4401267 [ABSTRACT FROM AUTHOR]

Reports the pattern of programmed cell death during the development of cephalochordates. Isolation and functional characterization of the first caspase related gene in amphioxus; Expression of caspase throughout development from gastrula to larva.