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Angiotensin II: preferential efferent constriction?

J Heller, V Horácek

    Renal Physiology
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Low doses of angiotensin II (AII) constrict efferent arterioles in dogs, reducing kidney function. This effect is blocked by inhibiting prostaglandin synthesis, suggesting prostaglandins protect afferent arterioles.

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    Area of Science:

    • Nephrology
    • Renal Physiology
    • Cardiovascular Pharmacology

    Background:

    • Angiotensin II (AII) plays a crucial role in regulating renal hemodynamics and glomerular filtration.
    • The effects of AII on renal function can be modulated by endogenous prostaglandins, particularly under conditions of suppressed AII production.

    Purpose of the Study:

    • To investigate the effects of a low-dose angiotensin II (AII) infusion on kidney function in dogs with maximally suppressed endogenous AII production.
    • To determine the role of prostanoid synthesis inhibition in modulating the renal hemodynamic responses to AII.

    Main Methods:

    • Dogs were subjected to high-salt diet and converting enzyme inhibition (CEI) to suppress endogenous AII production.
    • Subpressor doses of AII were infused intravenously, with and without concomitant administration of indomethacin or aspirin.

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  • Renal blood flow (RBF), glomerular filtration rate (GFR), filtration fraction (FF), glomerular capillary pressure (GCP), and arteriolar resistances (afferent RA, efferent RE) were measured.

    • Main Results:

    • AII infusion in CEI-treated dogs caused decreased RBF and GFR, with a preferential increase in efferent arteriolar resistance (RE).
    • Concomitant inhibition of prostanoid synthesis (indomethacin or aspirin) abolished the preferential efferent effect, leading to similar increases in both afferent (RA) and efferent (RE) arteriolar resistance.
    • Prostaglandin synthesis inhibition exacerbated the decrease in RBF and GFR and significantly increased total arteriolar resistance (RT).

    Conclusions:

    • Low-dose AII preferentially constricts efferent arterioles in dogs, contributing to reduced renal blood flow and glomerular filtration.
    • Vasodilatory prostaglandins, primarily acting on the afferent arteriole, play a protective role by counterbalancing the efferent constrictive effect of AII.
    • Inhibition of prostaglandin synthesis unmasks and potentiates the vasoconstrictive effects of AII on both afferent and efferent arterioles.