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Related Experiment Videos

Diltiazem increases renal prostacyclin.

T W Wilson1, M N Sharif, R D Kaushal

  • 1Departments of Pharmacology, University of Saskatchewan, Saskatoon.

Clinical and Investigative Medicine. Medecine Clinique Et Experimentale
|December 1, 1991
PubMed
Summary

Low dose diltiazem (D) enhances renal prostacyclin (PGI2) synthesis, improving renal blood flow during Angiotensin II (AII) infusion. This suggests PGI2 mediates diltiazem's renal vasodilator effect.

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Area of Science:

  • Nephrology
  • Pharmacology
  • Cardiovascular Physiology

Background:

  • Diltiazem (D) exhibits a specific renal vasodilator effect.
  • The mechanism underlying this effect, particularly its relation to renal prostacyclin (PGI2) synthesis, requires elucidation.
  • Understanding this mechanism is crucial for managing renal blood flow under vasoconstrictor stress.

Purpose of the Study:

  • To investigate whether the renal vasodilator effect of low-dose diltiazem (D) is mediated by increased renal prostacyclin (PGI2) synthesis.
  • To assess the role of PGI2 in mitigating Angiotensin II (AII)-induced renal vasoconstriction.

Main Methods:

  • Sprague-Dawley rats were infused with Angiotensin II (AII) to induce vasoconstriction.
  • Diltiazem (D) and/or indomethacin (IND) were administered to assess their effects on renal hemodynamics and urinary 6-keto-prostaglandin F1 alpha (6-ketoPGF1 alpha) excretion.
  • Renal plasma flow (RPF) was measured using 14C-PAH clearance (CPAH).

Main Results:

  • AII increased urinary 6-ketoPGF1 alpha excretion, indicating increased renal PGI2 synthesis, but reduced RPF.
  • Diltiazem (D) further increased 6-ketoPGF1 alpha excretion and reversed AII-induced renal vasoconstriction.
  • Indomethacin (IND) augmented the AII response and blocked the vasodilatory effect of D, suggesting PGI2 mediation.

Conclusions:

  • The renal vasodilator effect of low-dose diltiazem (D) is, at least in part, mediated by increased renal prostacyclin (PGI2) synthesis.
  • This PGI2-mediated mechanism may play a significant role in maintaining renal blood flow during vasoconstrictor stress.
  • Diltiazem's ability to enhance PGI2 production offers a potential therapeutic strategy for preserving renal function in conditions of reduced renal perfusion.

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