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Hypertension, Vol 5, 629-634, Copyright © 1983 by American Heart Association

ARTICLES

Arterial wall uptake of renal renin and blood pressure control

M Loudon, RF Bing, H Thurston and JD Swales

We have studied the contribution of circulating renin of renal origin to renin-like activity within the arterial wall and to blood pressure. Bolus injections of renin sufficient to elevate blood pressure by 44.7 mm Hg caused aortic renin to rise from 0.13 to 1.48 ng angiotensin I/100 mg/hr in nephrectomized rats. Elevation of aortic renin was still present at 6 hours, and this was associated with significant blood pressure elevation (p less than 0.05) which could be reversed by infusion of sarcosine, alanine, angiotensin II (saralasin). Prevention of the pressor effect by pretreatment with the converting enzyme inhibitor captopril did not reduce renin uptake. When kidneys were left in situ, although significant uptake of renin could be demonstrated 1 hour after injection, the increase at 3 hours was no longer significant (p greater than 0.05) and blood pressure returned to normal by 1 1/2 hours. This change in blood pressure may be related to the much more rapid clearance of circulating renin in the presence of normal kidneys or to other renal factors influencing the blood pressure response. The present studies demonstrate therefore that most of the renin-like activity within the aortic wall is derived from plasma renin and it seems probable that this component of the renin-angiotensin system plays an important role in blood pressure maintenance in the nephrectomized rats injected with renin. The relationship is less obvious in the presence of normal kidneys where additional influences may come into play.

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