Abstract
We discuss the involvement of several mammalian redox systems in the regulation of apoptosis. We focus especially on the role that mitochondria and the still ill-characterized plasma membrane NADH-oxidoreductase system play in apoptosis. The latter system was shown to respond to downregulation of mitochondrial function; inhibition of either system induces apoptosis. Apoptosis induced by inhibitors of the oxidase involves both Bcl-2 and calcineurin, two proteins recently shown to be capable of forming a tight complex. We suggest that Bcl-2 acts as an antioxidant, but in an electron sense rather than in an oxygen sense.
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