Abstract
The effects of the pig calcitonin on the kidney excretory function in normotensive (NR) and spontaneously hypertensive rats (SHR) were examined. Calcitonin injection in the dose of 0.6 U/100 g of the body mass in NR and SHR in the conditions of 6-hour spontaneous diuresis caused the increase in the urination volume due to the inhibition of the tubular water reabsorption and growth of the glomerular filtration rate. The important role in the mechanism of the decrease in the water reabsorption in SHR plays the decrease in the content of vasopressin in the blood and urea in the kidney interstitium while in NR a more marked inhibition of the water reabsorption is caused by the decrease in the concentration of both urea and sodium in the kidney layers. The natriuretic effect of calcitonin was noticed only in NR.
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