Cardiac Angiotensin II Receptors Are Downregulated by Chronic Angiotensin II Infusion in Rats

抄録

We studied the effect of chronic(7 days)angiotensin II infusion in a subpressor(200ng/kg per minute)dose on angiotensin II receptors in the left ventricle in rats.Infusion of angiotensin II caused an elevation in systolic blood pressure after 3 days, usually to values of about 150 mmHg, and the increase continued during the drug administration.The number of angiotensin II type 1 and angiotensin II type 2 receptors was significantly decreased by 20−30% in the angiotensin II−infused left ventricular membranes without affecting the affinity.Thus, these data suggest that angiotensin II may regulate the number of its own receptors in rat left ventricles.