title: Endothelium-dependent induction of vasorelaxation by the butanol extract of Phellinus igniarius in isolated rat aorta.
abstract: The butanol extract of Phellinus igniarius (BPI) induced relaxation of the phenylephrin e-precontracted rat aorta in a dose-dependent manner, and its effect was abolished by the removal of functional endothelium. Pretreatment of the aortic tissues with N(G)-nitro-L-arginine methyl ester (L-NAME), methylene blue, or 1H-[1,2,4]-oxadiazole-[4,3-alpha]-quinoxalin1-one (ODQ) inhibited the vascular relaxation induced by BPI. BPI-induced vascular relaxations were also markedly attenuated by the addition of verapamil or diltiazem, while the relaxant effect of BPI was not blocked by pretreatment with indomethacine, glibenclamide, tetraethylammonium (TEA), atropine, or propranolol. Incubation of endothelium-intact rat aorta with BPI increased the production of cGMP in a dose-dependent manner. These results suggest that BPI dilates vascular smooth muscle via endothelium-dependent nitric oxide-cGMP signaling pathway, with the possible involvement of L-type Ca(2+) channels.
authors.affiliation: Professional Graduate School of Oriental Medicine, Research Institute (MeRRI), Wonkwang University, Iksan, Jeonbuk, 570-749, Republic of Korea.
authors.forename: Dae Gill
authors.initials: DG
authors.lastname: Kang
authors.forename: Li Hua
authors.initials: LH
authors.lastname: Cao
authors.forename: Jun Kyoung
authors.initials: JK
authors.lastname: Lee
authors.forename: Deok Ho
authors.initials: DH
authors.lastname: Choi
authors.forename: Seung Ju
authors.initials: SJ
authors.lastname: Kim
authors.forename: Hyuck
authors.initials: H
authors.lastname: Lee
authors.forename: Jin Sook
authors.initials: JS
authors.lastname: Kim
authors.forename: Ho Sub
authors.initials: HS
authors.lastname: Lee
mesh_terms: D000818:Animals; D001011:Aorta / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D001285:Atropine / Q000494:pharmacology; D000440:Butanols / Q000737:chemistry; D006152:Cyclic GMP / Q000096:biosynthesis; D004110:Diltiazem / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005905:Glyburide / Q000494:pharmacology; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D008297:Male; D008751:Methylene Blue / Q000494:pharmacology; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D010069:Oxadiazoles / Q000494:pharmacology; D011124:Polyporaceae / Q000737:chemistry*; D011433:Propranolol / Q000494:pharmacology; D011810:Quinoxalines / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D019789:Tetraethylammonium / Q000494:pharmacology; D014664:Vasodilation / Q000187:drug effects* / Q000502:physiology; D014665:Vasodilator Agents / Q000302:isolation & purification / Q000494:pharmacology*; D014700:Verapamil / Q000494:pharmacology
chemical_list: C095284:1H-(1,2,4)oxadiazolo(4,3-a)quinoxalin-1-one; D000440:Butanols; D004791:Enzyme Inhibitors; D010069:Oxadiazoles; D011810:Quinoxalines; D014665:Vasodilator Agents; D019789:Tetraethylammonium; D001285:Atropine; D011433:Propranolol; D014700:Verapamil; D004110:Diltiazem; D006152:Cyclic GMP; D005905:Glyburide; D008751:Methylene Blue; D019331:NG-Nitroarginine Methyl Ester; D007213:Indomethacin