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J. Cell Biol., Volume 144, Number 5, March 8, 1999 883-889

The Release of Cytochrome c from Mitochondria during Apoptosis of NGF-deprived Sympathetic Neurons Is a Reversible Event

Isabelle Martinou,* Solange Desagher,* Robert Eskes,* Bruno Antonsson,* Elisabeth André,* Stanislav Fakan,Dagger and Jean-Claude Martinou*

* Serono Pharmaceutical Research Institute, Ares Serono International S.A., CH-1228 Plan-les-Ouates, Geneva, Switzerland; and Dagger  Center of Electron Microscopy, University of Lausanne, CH-1005 Lausanne, Switzerland

During apoptosis induced by various stimuli, cytochrome c is released from mitochondria into the cytosol where it participates in caspase activation. This process has been proposed to be an irreversible consequence of mitochondrial permeability transition pore opening, which leads to mitochondrial swelling and rupture of the outer mitochondrial membrane. Here we present data demonstrating that NGF-deprived sympathetic neurons protected from apoptosis by caspase inhibitors possess mitochondria which, though depleted of cytochrome c and reduced in size, remained structurally intact as viewed by electron microscopy. After re-exposure of neurons to NGF, mitochondria recovered their normal size and their cytochrome c content, by a process requiring de novo protein synthesis. Altogether, these data suggest that depletion of cytochrome c from mitochondria is a controlled process compatible with function recovery. The ability of sympathetic neurons to recover fully from trophic factor deprivation provided irreversible caspase inhibitors have been present during the insult period, has therapeutical implications for a number of acute neuropathologies.

Key words: apoptosis;  Bax;  cytochrome c;  mitochondria;  caspases


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