New molecular mechanisms for cardiovascular disease: Contribution of endothelium-derived hyperpolarizing factor in the regulation of vasoconstriction in peripheral resistance arteries

Xin Jin, Yukiko Satoh-Otonashi, Yoshito Zamami, Shingo Takatori, Narumi Hashikawa-Hobara, Yoshihisa Kitamura, Hiromu Kawasaki

Research output: Contribution to journalShort survey

22 Citations (Scopus)

Abstract

Endothelium regulates vascular tone via release of endothelium-derived relaxing factors (EDRF) including nitric oxide (NO), prostaglandin I2 (PGI2), and endothelium-derived hyperpolarizing factor (EDHF). The mesenteric vascular bed produces vascular resistance to develop blood pressure and regulate tissue blood flow that plays an important role in maintenance of systemic blood pressure. There is now strong evidence that in these small resistance arteries, EDHF plays a major role in the response to vasoactive substances and regulation of vascular tone. Pharmacological analysis to investigate the role of the vascular endothelium in the regulation of α 1-adrenoceptor agonist (methoxamine)-induced vasoconstriction in rat mesenteric vascular beds showed that vasoconstriction induced by continuous perfusion of methoxamine (7 μM), but not high KCl (60 mM), time-dependently decreased to 20% of the initial constriction. The time-dependent reduction of methoxamine-induced vasoconstriction was inhibited by endothelium removal, inhibitor of EDHF (30 mM KCl, K +-channel blockers), and gap-junction inhibitor, but not NO synthase inhibitor and cyclooxygenase inhibitor and ageing. These results suggest that vascular endothelium counteracts to normalize excess vasoconstriction of the mesenteric resistance arteries by releasing EDHF, which is associated with activation of multiple K +-channels and gap junction involvement and markedly decreases with ageing.

Original languageEnglish
Pages (from-to)332-336
Number of pages5
JournalJournal of Pharmacological Sciences
Volume116
Issue number4
DOIs
Publication statusPublished - Aug 24 2011

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Keywords

  • Age
  • Cardiovascular disease
  • Endothelial regulation of vasoconstriction
  • Endothelium-derived hyperpolarizing factor
  • Rat mesenteric artery

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology

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