Bax does not directly participate in the Ca(2+)-induced permeability transition of isolated mitochondria

The Journal of Biological Chemistry
Umberto De MarchiMario Zoratti

Abstract

The mitochondrial permeability transition pore and Bax have both been proposed to be involved in the release of pro-apoptotic factors from mitochondria in the "intrinsic" pathway of apoptosis. The permeability transition pore is widely thought to be a supramolecular complex including or interacting with Bax. Given the relevance of the permeability transition in vivo, we have verified whether Bax influences the formation and/or the properties of the Ca(2+)/P(i)-induced permeability transition by using mitochondriaisolated from isogenic human colon cancer bax(+/-) and bax(-/-) HCT116 cell lines. We used mitochondria isolated from both types of cells and from Bax(+) cells exposed to apoptotic stimuli, as well as Bax-less mitochondria into which exogenous Bax had been incorporated. All exhibited the same behavior and pharmacological profile in swelling and Ca(2+)-retention experiments. Mitochondria from a bax(-)/bak(-) cell line also underwent an analogous Ca(2+)/P(i)-inducible swelling. This similarity indicates that Bax hasno major role in regulating the Ca(2+)-induced mitochondrial permeability transition.

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