PMID: 6168763Jan 1, 1981Paper

Evidence for two compartments of exchangeable calcium in isolated rat liver mitochondria obtained using a 45Ca exchange technique in the presence of magnesium, phosphate, and ATPase at 37 degrees C

The Journal of Membrane Biology
G J Barritt

Abstract

The distribution of calcium between isolated rat liver mitochondria and the extramitochondrial medium at 37 degrees C and in the presence of 2 mM inorganic phosphate, 3 mM ATP, 0.05 or 1.1 mM free magnesium and a calcium buffer, nitrilotriacetic acid, was investigated using a 45Ca exchange technique. The amounts of 40Ca in the mitochondria and medium were allowed to reach equilibrium before initiation of the measurement of 45Ca exchange. At 0.05 mM free magnesium and initial extramitochondrial free calcium concentrations of between 0.15 and 0.5 microM, the mitochondria accumulated calcium until the extramitochondrial free calcium concentration was reduced to 0.15 microM. Control experiments showed that the mitochondria were stable under the incubation conditions employed. The 45Ca exchange data were found to be consistent with a system in which two compartments of exchangeable calcium are associated with the mitochondria. Changes in the concentration of inorganic phosphate did not significantly affect the 45Ca exchange curves, whereas an increase in the concentration of free magnesium inhibited exchange. The maximum rate of calcium outflow from the mitochondria was estimated to be 1.7 nmol/min per mg of protein, and the value o...Continue Reading

References

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Citations

Jul 1, 1988·The Journal of Membrane Biology·P JirounekR W Straub
Jan 1, 1983·International Journal of Health Services : Planning, Administration, Evaluation·T D SterlingH Dimich-Ward

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