Biochemical characterization of the mitochondrial permeability transition in isolated forebrain mitochondria.
Induction of the mitochondrial permeability transition (PT) has been proposed to contribute to neuronal cell death. Nearly all studies of the biochemistry of PT induction, however, have been conducted in isolated liver mitochondria. To better understand PT induction in brain mitochondria, we used Ficoll gradients to purify nonsynaptosomal mitochondria from the forebrains of male Fischer 344 rats. Incubation of these mitochondria with Ca(2+) was associated with a loss of absorbance. Inorganic phosphate enhanced this loss of absorbance, and the PT inhibitor cyclosporin A reduced it, especially in conjunction with ADP. These findings suggest that Ca(2+)-mediated loss of absorbance resulted from PT induction. Na(+), which enhances mitochondrial Ca(2+) efflux, but stimulates mitochondrial free radical production, had no effect on PT induction. These data confirm the existence of tissue-specific differences in the nature of PT induction.
Kristal
B S
BS
Dementia Research Service, Burke Medical Research Institute, White Plains, NY 10605, USA. bkristal@burke.org
Staats
P N
PN
Shestopalov
A I
AI
D000244:Adenosine Diphosphate / Q000378:metabolism / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism / Q000494:pharmacology; D002463:Cell Membrane Permeability / Q000187:drug effects / Q000502:physiology*; D016572:Cyclosporine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D018698:Glutamic Acid / Q000378:metabolism / Q000494:pharmacology; D007425:Intracellular Membranes / Q000187:drug effects / Q000378:metabolism*; D008293:Malates / Q000378:metabolism / Q000494:pharmacology; D008297:Male; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism*; D008929:Mitochondria, Heart / Q000187:drug effects / Q000378:metabolism; D008930:Mitochondria, Liver / Q000187:drug effects / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism / Q000494:pharmacology; D011205:Povidone / Q000494:pharmacology; D016548:Prosencephalon / Q000378:metabolism*; D051381:Rats; D011916:Rats, Inbred F344; D012822:Silicon Dioxide / Q000494:pharmacology; D019802:Succinic Acid / Q000378:metabolism / Q000494:pharmacology
D004791:Enzyme Inhibitors; D008293:Malates; D010710:Phosphates; D018698:Glutamic Acid; D000244:Adenosine Diphosphate; C016039:Percoll; D012822:Silicon Dioxide; C030298:malic acid; D016572:Cyclosporine; D019802:Succinic Acid; D011205:Povidone; D002118:Calcium