| New Molecular Mechanisms for Cardiovascular Disease:Contribution of Endothelium-Derived Hyperpolarizing Factor in the Regulation of Vasoconstriction in Peripheral Resistance Arteries. | |
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MedLine Citation:
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PMID: 21757845 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Endothelium regulates vascular tone via release of endothelium-derived relaxing factors (EDRF) including nitric oxide (NO), prostaglandin I(2) (PGI(2)), 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. |
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Authors:
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Xin Jin; Yukiko Satoh-Otonashi; Yoshito Zamami; Shingo Takatori; Narumi Hashikawa-Hobara; Yoshihisa Kitamura; Hiromu Kawasaki |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-14 |
Journal Detail:
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Title: Journal of pharmacological sciences Volume: - ISSN: 1347-8648 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101167001 Medline TA: J Pharmacol Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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