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Ruthenium red-induced calcium efflux from rat liver mitochondria is accelerated in the course of calcium-mediated mitochondrial transition. Analysis of the efflux patterns reveals biexponential kinetics consisting of the native slow phase preceded by a faster phase developing in the presence of calcium. The data are consistent with a progressive transformation of mitochondrial calcium into a rapidly dischargeable pool prior to spontaneous calcium release. Analysis of the efflux pattern is proposed as a method to discriminate between different mechanisms of modulation of ruthenium red-induced calcium efflux. Thus, it is shown that acetate, in contrast to phosphate, stimulates ruthenium red-induced calcium efflux due to the development of the rapidly dischargeable pool of calcium.

biological chemistry hoppe-seyler

On the State of Calcium Ions in Isolated Rat Liver Mitochondria. V. Development of a Rapidly Dischargeable Pool of Mitochondrial Calcium during Calcium-induced Transition