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  • Original Paper
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Endoplasmic reticulum localized Bcl-2 prevents apoptosis when redistribution of cytochrome c is a late event

Abstract

The disruption of mitochondrial function is a key component of apoptosis in most cell types. Localization of Bcl-2 to the outer mitochondrial and endoplasmic reticulum membranes is consistent with a role in the inhibition of many forms of apoptosis. In Rat-1 cells, a Bcl-2 mutant targeted exclusively to the endoplasmic reticulum (Bcl-cb5) was effective at inhibiting apoptosis induced by serum starvation/myc, or ceramide but not apoptosis induced by etoposide. The former conditions cause a decrease in mitochondrial transmembrane potential (Δψm) as an early event that precedes the release of cytochrome c from mitochondria. By contrast, when cells are exposed to etoposide, a situation in which cytochrome c release and membrane localization of the pro-apoptotic protein Bax precede loss of Δψm, wild type Bcl-2 but not Bcl-cb5 prevents apoptosis. Therefore, Bcl-2 functions in spatially distinct pathways of apoptosis distinguished by the order of cytochrome c release and loss of Δψm.

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Acknowledgements

The authors thank Drs Radhey Gupta and Richard Youle for generously supplying us with antibodies. This work was supported by a Medical Research Council of Canada grant (DW Andrews and B Leber), with additional funds from the Chedoke-McMaster Hospital/DesRoches Bone Marrow Transplant Foundation and a special grant from the Ligue Nationale contre le Cancer (G Kroemer). DWA is the recipient of a Senior Scientist Award from the Medical Research Council of Canada.

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Annis, M., Zamzami, N., Zhu, W. et al. Endoplasmic reticulum localized Bcl-2 prevents apoptosis when redistribution of cytochrome c is a late event. Oncogene 20, 1939–1952 (2001). https://doi.org/10.1038/sj.onc.1204288

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