title: Histamine-induced vasodilation and vasoconstriction in the mesenteric resistance artery of the rat.
abstract: The present study was designed to examine the vascular response to histamine in rat perfused mesenteric vascular beds with active tone. In preparations with intact endothelium, perfusion of histamine (1 nM-100 microM) produced a concentration-dependent vasodilation. Histamine-induced vasodilation was attenuated by L-NAME (nitric oxide (NO) synthase inhibitor, 100 microM) and olopatadine (histamine H(1) receptor antagonist, 1 microM) but not by lafutidine (histamine H(2) receptor antagonist, 1 microM). Cold-storage denervation (4 degrees C for 72 h) of the preparation with intact endothelium attenuated the histamine-induced vasodilation. In preparations without endothelium, histamine at low concentrations (1-100 nM) produced only a small and rapid vasodilation, whereas histamine at concentrations higher than 1 muM produced triphasic vascular responses: initial sharp vasodilation followed by transient vasoconstriction and subsequent gradual vasodilation. Lafutidine abolished only the histamine-induced initial vasodilation. Olopatadine abolished the histamine-induced second vasoconstriction and third vasodilation. Cold-storage denervation of the denuded preparation abolished the histamine-induced second vasoconstriction and third vasodilation. These findings suggest that histamine induced endothelium-dependent vasodilation via endothelium histamine H(1) receptors and endothelium-independent vasodilation via smooth muscle histamine H(2) receptors. It is also suggested that the histamine-induced endothelium-independent vasoconstriction and vasodilation are mediated by histamine H(1) receptors and perivascular nerves.
authors.affiliation: Department of Clinical Pharmaceutical Sciences, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan.
authors.forename: Honghua
authors.initials: H
authors.lastname: Jin
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Koyama
authors.forename: Yukako
authors.initials: Y
authors.lastname: Hatanaka
authors.forename: Shinji
authors.initials: S
authors.lastname: Akiyama
authors.forename: Fusako
authors.initials: F
authors.lastname: Takayama
authors.forename: Hiromu
authors.initials: H
authors.lastname: Kawasaki
mesh_terms: D000818:Animals; D003714:Denervation; D004305:Dose-Response Relationship, Drug; D006632:Histamine / Q000494:pharmacology*; D006633:Histamine Antagonists / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D008638:Mesenteric Arteries / Q000187:drug effects* / Q000294:innervation / Q000378:metabolism; D010477:Perfusion; D051381:Rats; D017208:Rats, Wistar; D011969:Receptors, Histamine H1 / Q000378:metabolism; D011970:Receptors, Histamine H2 / Q000378:metabolism; D014655:Vascular Resistance / Q000187:drug effects*; D014661:Vasoconstriction / Q000187:drug effects*; D014664:Vasodilation / Q000187:drug effects*
chemical_list: D006633:Histamine Antagonists; D011969:Receptors, Histamine H1; D011970:Receptors, Histamine H2; D006632:Histamine