Abnormal renal hemodynamic response to reduced renal perfusion pressure in diabetic rats: Role of NO

J. P. Tolins, P. J. Shultz, L. Raij, D. M. Brown, S. M. Mauer

Research output: Contribution to journalArticle

141 Scopus citations

Abstract

Diabetic rats manifest abnormal renal hemodynamic responses, with persistent renal vasodilation at reduced renal perfusion pressures. We hypothesized that in diabetes, renal hemodynamics are modulated by increased activity of the endogenous vasodilator, NO. In anesthetized Munich-Wistar rats, after 6 wk of streptozotocin-induced, insulin-treated diabetes, and in age-matched, nondiabetic littermates (n = 7-8), basal renal hemodynamics and responses to graded reductions in renal perfusion pressure were determined before and after intrarenal arterial infusion of the NO synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME). An identical protocol was followed in a second cohort of rats pretreated with indomethacin (4 mg/kg iv). Diabetic rats demonstrated hyperglycemia, renal enlargement, hyperfiltration, and increased urinary excretion of the stable NO metabolites, NO2 and NO3. L-NAME eliminated basal hyperfiltration in diabetic rats, and L-NAME, but not indomethacin, also eliminated persistent renal vasodilation at reduced renal perfusion pressure. We conclude that in a rat model of diabetes, increased endogenous NO activity may play a role in basal hyperfiltration and in the persistent renal vasodilatation manifested at reduced renal perfusion pressures.

Original languageEnglish (US)
Pages (from-to)F886-F895
JournalAmerican Journal of Physiology - Renal Fluid and Electrolyte Physiology
Volume265
Issue number6 34-6
DOIs
StatePublished - 1993

Keywords

  • Autoregulation
  • Endothelium-derived relaxing factor
  • Nitric oxide
  • Prostaglandins
  • Renal blood flow

ASJC Scopus subject areas

  • Physiology

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