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Kidney and calcitonin.

Calcitonin, whatever its origin, produces a decrease in the renal tubular reabsorption of sodium, phosphate and calcium in man and in the rat. Renal receptors for calcitonin have been demonstrated in the membranes of rat tubular cells using 125I salmon calcitonin as a tracer. Hormone-receptor interaction initiates the activation of membrane adenyl cyclase. In the rat and in man, the kidney plays a major role in degradation of both human and salmon calcitonin. Plasma levels of immunoreactive calcitonin are high in chronic renal failure. The question of the physiological role of calcitonin on kidney function is still unsettled.