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Bcl-2 blocks apoptosis in cells lacking mitochondrial DNA

Abstract

WHEN the mammalian proto-oncogene bcl-2 is overexpressed it can protect various types of cells both from normal and from experimentally induced apoptosis1–6 A but the molecular mechanisms involved are unknown. Although the Bcl-2 protein is membrane-associated7–10, its subcellular location is controversial: two studies have suggested that it is mainly associated with the nuclear envelope and endoplasmic reticulum8,10, whereas another study has suggested that it is mainly located in the inner mitochondrial membrane9. The latter study has suggested that Bcl-2 might protect cells from apoptosis by altering mitochondrial function and that mitochondria may be involved in apoptosis9,11. Here we report that human mutant cell lines that lack mitochondrial DNA (mtDNA), and therefore do not have a functional respiratory chain, can still be induced to die by apoptosis, and that they can be protected from apoptosis by the overexpression of bcl-2, suggesting that neither apoptosis nor the protective effect of bcl-2 depends on mitochondrial respiration. We also show that the Bcl-2 protein in overexpressing cells is associated with the nuclear envelope and endoplasmic reticulum, as well as with mitochondria.

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Jacobson, M., Burne, J., King, M. et al. Bcl-2 blocks apoptosis in cells lacking mitochondrial DNA. Nature 361, 365–369 (1993). https://doi.org/10.1038/361365a0

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