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. 1976 Apr;9(4):655–660. doi: 10.1128/aac.9.4.655

Salinomycin Effects on Mitochondrial Ion Translocation and Respiration

Mitsuaki Mitani 1,2, Tadashi Yamanishi 1,2, Yukio Miyazaki 1,2, Noboru Ōtake 1,2
PMCID: PMC429593  PMID: 131509

Abstract

The effects of salinomycin on alkali cation transport and membrane functions in rat liver mitochondria have been investigated. After potassium uptake, stimulated by valinomycin or monazomycin in the presence of adenosine 5′-triphosphate, salinomycin caused rapid release of K+ from mitochondria. Salinomycin reversed valinomycin- or monazomycin-induced oscillatory swelling of mitochondria preloaded with K+, Rb+, and Na+ but was without effect on Li+ or Cs+ preloaded mitochondria. Salinomycin blocked the retention of K+ more effectively than the retention of Rb+ or Na+. Salinomycin inhibited both coupled and uncoupled respiration with strict substrate specificity in medium of low but not in high K+ concentration. The oxidation of glutamate, α-ketoglutarate, and malate plus pyruvate was inhibited by salinomycin, but that of β-hydroxybutyrate or succinate was not significantly affected. Salinomycin inhibited adenosine triphosphatase activity of mitochondria induced by valinomycin or monazomycin in K+ and Rb+ medium without significantly affecting adenosine triphosphatase activity in Li+, Na+, or Cs+ medium. Oxidative phosphorylation in mitochondria was inhibited by salinomycin but the inhibitory effect of salinomycin lacked the substrate specificity observed for respiration. It is proposed that salinomycin perturbs mitochondrial functions by acting as a mobile carrier for alkali cations through membranes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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