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Related Experiment Videos

Renal dopamine and sodium excretion.

S S Hegde1, M F Lokhandwala

  • 1Department of Pharmacology, University of Houston, TX 77204-5515.

American Journal of Hypertension
|June 1, 1990
PubMed
Summary

Low-dose fenoldopam induces diuresis and natriuresis via direct renal DA-1 receptor activation. Endogenous dopamine also activates these DA-1 receptors, contributing to sodium excretion during saline loading.

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Area of Science:

  • Nephrology
  • Pharmacology
  • Physiology

Background:

  • Dopamine (DA) plays a role in regulating renal function.
  • The specific contribution of renal dopamine receptors to natriuresis is not fully understood.

Purpose of the Study:

  • To investigate the direct tubular effects of fenoldopam on renal function.
  • To determine the role of renal dopamine (DA) and DA receptors in the natriuretic response to acute sodium loading.

Main Methods:

  • Administered low-dose fenoldopam to pentobarbital-anesthetized rats.
  • Utilized selective DA-1 and DA-2 receptor antagonists (SCH 23390 and domperidone).
  • Performed isotonic sodium chloride loading experiments.

Main Results:

  • Fenoldopam increased urine output and sodium excretion without affecting blood pressure, renal blood flow, or heart rate.
  • The renal effects of fenoldopam were blocked by the DA-1 antagonist SCH 23390.
  • Sodium loading increased urinary DA excretion, which correlated with sodium excretion; this effect was attenuated by SCH 23390 but not domperidone.

Conclusions:

  • Renal tubules possess DA-1 receptors that mediate diuresis and natriuresis upon activation.
  • Endogenous dopamine activates renal DA-1 receptors, contributing to natriuresis during saline loading.

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