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Related Experiment Videos

Renal interactions between norepinephrine and calcium antagonists.

T H Steele, L Challoner-Hue

    Kidney International
    |November 1, 1984
    PubMed
    Summary

    Calcium antagonists like diltiazem and verapamil effectively counteract norepinephrine-induced drops in glomerular filtration rate (GFR) in rat kidneys. These drugs selectively block norepinephrine

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    Area of Science:

    • Nephrology
    • Pharmacology
    • Physiology

    Background:

    • Norepinephrine is a key regulator of renal hemodynamics.
    • Calcium ions play a critical role in vascular smooth muscle contraction.
    • The interaction between norepinephrine and calcium channels in the kidney is not fully understood.

    Purpose of the Study:

    • To investigate the effects of calcium antagonists on norepinephrine-induced changes in glomerular filtration rate (GFR) and renal vascular resistance (RVR).
    • To determine if calcium antagonists selectively block the vasoconstrictor effects of norepinephrine on afferent arterioles.
    • To compare the effects of calcium antagonists with low extracellular calcium on renal function.

    Main Methods:

    • Isolated rat kidneys were perfused at a constant pressure.
    • The effects of norepinephrine alone and in combination with diltiazem or verapamil on GFR and RVR were measured.
    • Experiments were conducted with varying extracellular calcium concentrations.

    Main Results:

    • Norepinephrine significantly increased RVR and decreased GFR.
    • Diltiazem and verapamil reversed the effects of norepinephrine on RVR and GFR.
    • Calcium antagonists, but not low-calcium perfusate, increased GFR in the presence of norepinephrine.
    • Renal vascular sensitivity to norepinephrine decreased with reduced extracellular calcium or presence of calcium antagonists.

    Conclusions:

    • Diltiazem and verapamil selectively block the vasoconstrictor action of norepinephrine on afferent arterioles.
    • Calcium antagonists can mitigate the adverse effects of norepinephrine on GFR.
    • Low extracellular calcium concentration reduces renal vascular sensitivity to norepinephrine but does not replicate the GFR-facilitating effect of calcium antagonists.

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