Effects of endothelin-induced nitric oxide on venous circulation and renal water-electrolyte handling

Kozo Ota, Tokihisa Kimura, Masaru Shoji, Masahiro Ota, Takeharu Funyu, Takefumi Mori, Takayuki Sahata

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

To assess the interaction of endothelin (ET) with nitric oxide (NO) and the effects on venous circulation and handling of renal water and electrolytes, ET (1.0 ng/kg/min) or saline was administered with or without three doses (0.27, 2.7 and 27 ng/kg/min for 40 min) of Nω-nitro-L-arginine methyl ester (L-NAME), an NO synthase inhibitor, in anesthetized dogs. ET increased total peripheral resistance (TPR), pulmonary capillary wedge pressure (PCWP), urine flow (UF), and urinary K excretion (UKV), and decreased cardiac output (CO), urinary osmolality (Uosm), renal plasma flow (RPF), and glomerular filtration rate (GFR). L-NAME increased blood pressure (BP), TPR, PCWP, right atrial pressure (RAP), and mean circulatory filling pressure (MCFP), and decreased CO, RPF, and GFR. ET plus L-NAME markedly increased TPR, resistance to venous return, and plasma atrial natriuretic peptide (ANP), but not BP and MCFP, and curtailed the ET-induced responses in UF, UKV, and Uosm. Plasma aldosterone (ALD) was decreased in all groups, but plasma vasopressin (AVP) and renin activity (PRA) were not altered in any group. These results indicate that ET-induced NO formation might mitigate increases in venous as well as arterial vascular resistance and changes in renal handling of water and electrolytes, and might also play an inhibitory role in ANP release but not in PRA or AVP and ALD release.

Original languageEnglish
Pages (from-to)S128-S132
JournalJournal of cardiovascular pharmacology
Volume31
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Endothelin
  • L-NAME
  • Nitric oxide
  • Venous circulation

ASJC Scopus subject areas

  • Pharmacology
  • Cardiology and Cardiovascular Medicine

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