Abstract
We have examined the effects of truncated Bid (tBid) and ceramide on mitochondrial membrane integrity and cytochrome c release, using mitochondria with intact outer membranes. While tBid permeabilizes the outer membrane and efficiently stimulates cytochrome c release, digitonin is unable to cause cytochrome c release in the absence of salt. Ceramides did not permeabilize the mitochondrial outer membrane, and stimulated cytochrome c release only in the presence of digitonin. Taken together, these observations support a model for cytochrome c release in which the first step is dissociation from the inner membrane followed by transit across the outer membrane.
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