Role of endothelin ETB receptors in the renal hemodynamic and excretory responses to big endothelin-1

Fumiko Konishi, Yuka Okada, Masanori Takaoka, Cheryl E. Gariepy, Masashi Yanagisawa, Yasuo Matsumura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We determined the role of endothelin ETB receptor in the renal hemodynamic and excretory responses to big endothelin-1, using A-192621, a selective endothelin ETB receptor antagonist and the spotting-lethal (sl) rat, which carries a naturally occurring deletion in the endothelin ETB receptor gene. An intravenous injection of big endothelin-1 produced a hypertensive effect, which is greater in wild-type (+/+) rats pretreated with A-192621 and in homozygous (sl/sl) rats. Big endothelin-1 markedly increased urine flow, urinary excretion of sodium and fractional excretion of sodium in wild-type rats treated with the vehicle. These excretory responses to big endothelin-1 were markedly reduced by pharmacological endothelin ETB receptor blockade. On the other hand, big endothelin-1 injection to the endothelin ETB receptor-deficient homozygous animals resulted in a small diuretic effect. When renal perfusion pressure was protected from big endothelin-1-induced hypertension by an aortic clamp, the excretory responses in vehicle-treated wild-type rats were markedly attenuated. In homozygous or A-192621-treated wild-type rats, there was a small but significant decreasing effect in urine flow. In addition, big endothelin-1 significantly elevated nitric oxide (NO) metabolite production in the kidney of wild-type rats but not in the homozygous rats. We suggest that the diuretic and natriuretic responses to big endothelin-1 consist of pressure-dependent and pressure-independent effects and that the increased NO production via the activation of endothelin ETB receptors in the kidney is closely related to the big endothelin-1-induced excretory responses.

Original languageEnglish (US)
Pages (from-to)177-184
Number of pages8
JournalEuropean Journal of Pharmacology
Volume451
Issue number2
DOIs
StatePublished - Sep 13 2002

Fingerprint

Endothelin Receptors
Endothelin-1
Hemodynamics
Kidney
A 192621
Metrorrhagia
Diuretics
Pressure
Nitric Oxide
Sodium
Urine
Intravenous Injections
Perfusion
Pharmacology
Hypertension
Injections

Keywords

  • Diuresis
  • Endothelin ET receptor
  • Endothelin-1, big
  • Hypertension
  • Nitric oxide (NO)

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Pharmacology

Cite this

Role of endothelin ETB receptors in the renal hemodynamic and excretory responses to big endothelin-1. / Konishi, Fumiko; Okada, Yuka; Takaoka, Masanori; Gariepy, Cheryl E.; Yanagisawa, Masashi; Matsumura, Yasuo.

In: European Journal of Pharmacology, Vol. 451, No. 2, 13.09.2002, p. 177-184.

Research output: Contribution to journalArticle

Konishi, Fumiko ; Okada, Yuka ; Takaoka, Masanori ; Gariepy, Cheryl E. ; Yanagisawa, Masashi ; Matsumura, Yasuo. / Role of endothelin ETB receptors in the renal hemodynamic and excretory responses to big endothelin-1. In: European Journal of Pharmacology. 2002 ; Vol. 451, No. 2. pp. 177-184.
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