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Factors affecting Ca2+ transport in mouse islet and kidney mitochondria.

The transport of Ca2+ in islet and kidney mitochondria respiring on succinate was inhibited by atractylate and fluorocitrate, and stimulated by pyruvate, isocitrate, alpha-ketoglutarate, dibutyryl cAMP, oligomycin and bongkrekate, and by in vivo administration of glucagon, glyceraldehyde or glucose. The kidney [beta-hydroxybutyrate]/[acetoacetate] ratio was increased in glyceraldehyde treated mice. The data suggest a relationship, which might be influenced by cAMP, between activity of pyruvate, isocitrate and alpha-ketoglutarate dehydrogenases and transport of Ca2+ in islet and kidney mitochondria. A contributory role of reductive carboxylation for Ca2+ uptake, and a role of citrate for Ca2+ retention are discussed.