Abstract
Cell membrane potential and intracellular potassium activity (microelectrodes filled with ion-sensitive liquid ion exchanger) were measured in the zona glomerulosa of superfused hemi-adrenals of rats kept on different diets. Simultaneously, samples of the superfusate were collected and analyzed by radioimmunoassay for aldosterone content. Cell membrane potential and intracellular potassium activity were not influenced by high sodium, low sodium or high potassium diet. However, aldosterone secretion significantly changed. These results suggest that membrane potential and intracellular potassium activity per se may not be linked to changes in aldosterone secretion. Aldosterone secretion Membrane potential Intracellular potassium activity Adrenal zona glomerulosa Changes in diet
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