THE EFFECTS OF PORCINE CALCITONIN ON RENAL FUNCTION IN THE RABBIT

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Abstract
SUMMARY: Extracts of porcine thyroid containing calcitonin produced increases in urinary flow and urinary electrolyte content when infused or injected into anaesthetized rabbits. This response occurred more rapidly after intraaortic than after intravenous injection and was accompanied by an increase in glomerular filtration rate (inulin clearance) and renal plasma flow (paraaminohippuric acid clearance). Preparations of calcitonin failed to affect the short-circuit current in isolated frog skin. Although an effect of calcitonin on renal tubular transport mechanisms cannot be excluded it seems likely that one mechanism responsible for the diuretic effect of this compound in the rabbit is an increase in renal blood flow.

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