alexa Characteristics of the blood pressure lowering action of renin inhibition and comparison with angiotensin converting enzyme inhibition.


Translational Medicine

Author(s): Blaine EH

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Abstract Mean arterial blood pressure (MAP) was 100 +/- 4 mmHg in a group (n = 3) of conscious sodium-deficient dogs. A 3-day infusion of the renin inhibitor isovaleryl -His-Pro-Phe-His-Sta-Leu-Phe-NH2 (SCRIP) lowered MAP to an average of 79 +/- 4 mmHg. Termination of the infusion resulted in a prompt rise in MAP to 100 +/- 5 mmHg but plasma renin activity (PRA), which was 22 +/- 2 ng angiotensin (Ang) l/ml per h before the infusion, recovered only to 5 +/- 1 ng Ang l/ml per h during the same time (4 h after infusion). In other experiments in sodium-deficient dogs, a direct comparison was made between inhibition of PRA and the reduction of blood pressure. Over the dose range 0.1-2 micrograms/kg per min, PRA was inhibited in a dose-related manner, but MAP was not reduced. At dose levels beginning an order of magnitude higher (e.g. 20-160 g/kg per min), PRA was completely inhibited and there was a dose-related fall in MAP. These data suggest that there is no correlation between inhibition of PRA and the reduction in blood pressure in chronically sodium-deficient dogs. In other studies comparing renin inhibition with angiotensin converting enzyme (ACE) inhibition, there was evidence for greater efficacy of ACE inhibition in conscious sodium-deficient dogs, but no evidence of any difference in one-kidney, one clip hypertensive dogs.
This article was published in J Hypertens Suppl and referenced in Translational Medicine

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