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Potassium load prevents the decrease of GFR induced by captopril in sodium-depleted rats.

M Rathaus1, A Pomeranz, E Podjarny

  • 1Department of Nephrology, Meir Hospital, Kfar Saba, Israel.

The American Journal of Physiology
|March 1, 1990
PubMed
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Potassium loading prevents a drop in glomerular filtration rate (GFR) in rats treated with captopril and sodium depletion. This effect is linked to increased prostanoid synthesis in the glomerulus.

Area of Science:

  • Nephrology
  • Pharmacology
  • Physiology

Background:

  • Captopril reduces glomerular filtration rate (GFR) in sodium-depleted rats.
  • Captopril inhibits glomerular prostanoid synthesis stimulated by sodium depletion.
  • Potassium loading stimulates glomerular prostanoid production in normal rats.

Purpose of the Study:

  • To investigate the effects of potassium loading in sodium-depleted, captopril-treated rats.
  • To determine if potassium loading can counteract the GFR-lowering effects of captopril in sodium depletion.

Main Methods:

  • Studied sodium-depleted rats treated with captopril, subjected to potassium or chloride loading.
  • Measured glomerular synthesis of 6-ketoprostaglandin F1 alpha and thromboxane B2.
  • Assessed urinary kallikrein-like activity, plasma aldosterone, and renal clearances (inulin and p-aminohippurate).

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Main Results:

  • Potassium loading, but not chloride loading, stimulated glomerular prostanoid synthesis (PGF1 alpha, TxB2).
  • Potassium-loaded rats showed increased urinary kallikrein-like activity and plasma aldosterone.
  • Potassium loading significantly improved glomerular filtration rate (GFR) and renal plasma flow in captopril-treated, sodium-depleted rats.

Conclusions:

  • Potassium loading prevents the decrease in GFR induced by captopril in sodium-depleted rats.
  • This protective effect appears to be mediated by the stimulation of glomerular prostanoid synthesis.
  • The findings suggest a potential therapeutic role for potassium in managing captopril-induced renal effects.