Prolonged, but not acute, glutathione depletion promotes Fas-mediated mitochondrial permeability transition and apoptosis in mice

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
D HaouziD Pessayre

Abstract

Glutathione depletion either decreased or increased death-receptor-mediated apoptosis in previous studies. Comparison of the durations of glutathione depletion before death-receptor stimulation in these studies might suggest a different effect of prolonged versus acute thiol depletion. We compared the effects of the prolonged glutathione depletion caused by a sulfur amino acid-deficient (SAA(-)) diet and the acute depletion caused by a single dose of phorone on hepatic apoptosis triggered by the administration of an agonistic anti-Fas antibody. The chronic SAA(-) diet did not affect hepatic Fas or Bcl-XL, but increased p53 and Bax, and exacerbated Fas-mediated mitochondrial membrane depolarization, electron-microscopy-proven outer mitochondrial membrane rupture, cytochrome c translocation to the cytosol, and caspase 3 activation. These effects were prevented by cyclosporin A, an inhibitor of mitochondrial permeability transition. The SAA(-) diet increased internucleosomal DNA fragmentation, the percentage of apoptotic hepatocytes, serum alanine transaminase (ALT) activity, and mortality after Fas stimulation. Despite a similar decrease in hepatic glutathione, administration of a single dose of phorone 1 hour before the anti-Fas...Continue Reading

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