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

doi:10.1254/jphs.10R30FM

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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

Author information

Xin Jin
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan
Yukiko Satoh-Otonashi
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan
Yoshito Zamami
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan
Shingo Takatori
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan
Narumi Hashikawa-Hobara
Department of Life Science, Okayama University of Science, Japan
Yoshihisa Kitamura
Department of Pharmaceutical Care and Health Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan
Hiromu Kawasaki
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan

Keywords: endothelium-derived hyperpolarizing factor, endothelial regulation of vasoconstriction, age, rat mesenteric artery, cardiovascular disease

JOURNAL FREE ACCESS

2011 Volume 116 Issue 4 Pages 332-336

DOI https://doi.org/10.1254/jphs.10R30FM

View "Advance Publication" version (July 14, 2011).

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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 α₁-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.

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