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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Author(s)

    • Jin Xin JIN Xin
    • Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
    • TAKATORI Shingo
    • Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
    • KITAMURA Yoshihisa
    • Department of Pharmaceutical Care and Health Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
    • KAWASAKI Hiromu
    • Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University

Abstract

Endothelium regulates vascular tone via release of endothelium-derived relaxing factors (EDRF) including nitric oxide (NO), prostaglandin I<SUB>2</SUB> (PGI<SUB>2</SUB>), 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 <I>α</I><SUB>1</SUB>-adrenoceptor agonist (methoxamine)-induced vasoconstriction in rat mesenteric vascular beds showed that vasoconstriction induced by continuous perfusion of methoxamine (7 <I>μ</I>M), 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<SUP>+</SUP>-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<SUP>+</SUP>-channels and gap junction involvement and markedly decreases with ageing.

Journal

  • Journal of Pharmacological Sciences

    Journal of Pharmacological Sciences 116(4), 332-336, 2011-08-20

    The Japanese Pharmacological Society

References:  40

Cited by:  3

Codes

  • NII Article ID (NAID)
    10029895441
  • NII NACSIS-CAT ID (NCID)
    AA11806667
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13478613
  • NDL Article ID
    11206862
  • NDL Source Classification
    ZS51(科学技術--薬学)
  • NDL Call No.
    Z53-D199
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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