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. 1978 Mar;61(3):610–623. doi: 10.1172/JCI108972

The effect of altered sodium balance upon renal vascular reactivity to angiotensin II and norepinephrine in the dog. Mechanism of variation in angiotensin responses.

J A Oliver, P J Cannon
PMCID: PMC372573  PMID: 641142

Abstract

The mechanism whereby the vasoconstrictor response to angiotensin II (AII) is influenced by sodium balance or disease is unclear. To explore this question, the renal vascular responses (RVR) to intrarenal injections of subpressor doses of AII and norepinephrine were studied in dogs with an electromagnetic flowmeter. Acute and chronic sodium depletion increased plasma renin activity (PRA) and blunted the RVR to AII, while acute sodium repletion and chronic sodium excess plus desoxycorticosterone acetate decreased PRA and enhanced the RVR to AII. The magnitude of the RVR to AII was inversely related to PRA. The RVR to norepinephrine was unaffected by sodium balance and was not related to PRA. Inhibition of the conversion of angiotensin I to AII by SQ 20,881 during sodium depletion lowered mean arterial blood pressure (MABP), increased renal blood flow (RBF), and enhanced the RVR to AII but not to norepinephrine. Administration of bradykinin to chronically sodium-depleted dogs also lowered the MABP and increased RBF but had no effect on the RVR to AII. SQ 20,881 had no effect on MABP, RBF, or the RVR to AII in the dogs with chronic sodium excess and desoxycorticosterone acetate. Administration of indomethacin to chronically sodium-depleted dogs lowered RBF but did not influence the RVR to AII. The results indicate that the RVR to AII is selectively influenced by sodium balance and that the magnitude of the response is inversely related to the availability of endogenous AII. The data did not suggest that the variations in the RVR to AII were because of direct effects of sodium on vascular contraction, changes in the number of vascular AII receptors, or the renal prostaglandins. The results are consistent with the hypothesis that the vasoconstrictor effect of AII in the renal vasculature is primarily dependent upon the degree to which the AII vascular receptors are occupied by endogenous hormone.

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Selected References

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