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Effect of pH on the calcium metabolism of isolated rat kidney cells

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Summary

The effects of metabolic and respiratory acidosis and alkalosis on cellular calcium metabolism were studied in rat kidney cells dispersed with collagenase. In both types of acidosis, the intracellular pH, total cell calcium, and the cell relative radioactivity after 60 min of labeling are significantly depressed. Kinetic analysis of45Ca desaturation curves shows that acidosis decreases all three cellular calcium pools and depresses calcium fluxes between the superficial and cytosolic pools and between the cytosolic and mitochondrial pools. In alkalosis the intracelluar pH, the total cell calcium, and the cell relative radioactivity are significantly increased. Kinetic studies show that in alkalosis, only the mitochondrial pool is consistently increased. Calcium exchange between the mitochondrial and cytosolic pool is increased in metabolic alkalosis only. These results suggest that hydrogen ion is an important modulator of calcium metabolism, and that the intracellular pH rather than extracellular pH is the critical factor in determining the calcium status of cells during altered acid-base conditions.

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Authors and Affiliations

  1. Department of Physiology, University of Pittsburgh School of Medicine, 15261, Pittsburgh, Pennsylvania

    Rebecca K. Studer & André B. Borle

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  1. Rebecca K. Studer
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  2. André B. Borle
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Studer, R.K., Borle, A.B. Effect of pH on the calcium metabolism of isolated rat kidney cells. J. Membrain Biol. 48, 325–341 (1979). https://doi.org/10.1007/BF01869444

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  • DOI: https://doi.org/10.1007/BF01869444

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