Experimental Physiology
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Experimental Physiology 75.6 pp 855-858
© The Physiological Society 1990
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Experimental Physiology, Vol 75, Issue 6, 855-858
Copyright © 1990 by The Physiological Society

Article

Subcellular elemental composition in isolated cardiac myocytes from rabbit following chronic potassium depletion and acute repletion, studied by X-ray microanalysis

JP Ward and A Warley

X-ray microanalysis was used to estimate K, Na, Cl, Mg, P and S within the mitochondria and the myofibrillar regions of cardiac myocytes from rabbits, following dietary potassium depletion. K depletion caused no changes in mitochondrial K, but myofibrillar K was reduced. There were no changes in Na, Mg or Cl. Both areas showed increases in P but decreases in S. Acute K repletion resulted in a significant overshoot of K in both areas, coupled with a profound decrease in Cl. P was reduced in the mitochondria alone. These results may be partly explained by adaptive changes in Na+ pump activity.




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Copyright © 1990 by the The Physiological Society.