Peroxynitrite stimulates the pyridine nucleotide-linked Ca2+ release from intact rat liver mitochondria

Biochemistry
M Schweizer, C Richter

Abstract

Rat liver mitochondria contain a specific Ca2+ release pathway which operates when oxidized mitochondrial pyridine nucleotides are hydrolyzed in a Ca2+-dependent manner to ADP-ribose and nicotinamide. We have previously shown that NAD+ hydrolysis is inhibited by cyclosporin A and is possible only when some vicinal thiols are cross-linked. Here we report that the thiol oxidant peroxynitrite (ONOO-), which can form from nitric oxide (nitrogen monoxide, NO.) and superoxide anion (O2-), at low concentrations stimulates the specific Ca2+ release pathway. Both peroxynitrite-induced pyridine nucleotide hydrolysis and Ca2+ release are inhibited by cyclosporin A, and peroxynitrite is ineffective when pyridine nucleotides are kept reduced. Ca2+ release induced by peroxynitrite occurs with maintenance of the mitochondrial membrane potential and is not accompanied by entry of sucrose into mitochondria. The results suggest that peroxynitrite stimulates the specific Ca2+ release from intact mitochondria by modifying critical mitochondrial thiols other than glutathione in such a way that hydrolysis of oxidized pyridine nucleotides is achieved. These findings provide further insight into the regulation of Ca2+ release from mitochondria by nitr...Continue Reading

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