title: Hypotensive effect of butein via the inhibition of angiotensin converting enzyme.
abstract: Butein (3,4,2',4'-tetrahydroxychalcone), a plant polyphenol, has been known to elucidate endothelium-dependent vasodilation. In the present study, the hypotensive effect of butein and its possible mechanism, especially an angiotensin converting enzyme (ACE) inhibitory effect, were investigated. Intravenous injection of butein lowered the arterial blood pressure of anesthetized rats in a dose-dependent manner. The plasma ACE activities were significantly inhibited by the addition of butein in a dose-dependent manner, the IC(50) value of which was 198 microg/ml (730 microM). Moreover, angiotensin I-induced contraction was markedly attenuated by prior exposure of endothelium-intact aortic rings to butein, but angiotensin II-induced contraction was not altered. These results suggest that butein has a hypotensive effect, at least in part, via the inhibition of angiotensin converting enzyme.
authors.affiliation: Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk, Republic of Korea.
authors.forename: Dae Gill
authors.initials: DG
authors.lastname: Kang
authors.forename: Yun Cheol
authors.initials: YC
authors.lastname: Kim
authors.forename: Eun Jin
authors.initials: EJ
authors.lastname: Sohn
authors.forename: Yun Mi
authors.initials: YM
authors.lastname: Lee
authors.forename: An Sook
authors.initials: AS
authors.lastname: Lee
authors.forename: Ming Hao
authors.initials: MH
authors.lastname: Yin
authors.forename: Ho Sub
authors.initials: HS
authors.lastname: Lee
mesh_terms: D000803:Angiotensin I / Q000037:antagonists & inhibitors / Q000494:pharmacology; D000804:Angiotensin II / Q000037:antagonists & inhibitors / Q000494:pharmacology; D000806:Angiotensin-Converting Enzyme Inhibitors; D000818:Animals; D000959:Antihypertensive Agents; D001013:Aorta, Thoracic / Q000187:drug effects; D001794:Blood Pressure / Q000187:drug effects; D002599:Chalcone / Q000031:analogs & derivatives* / Q000494:pharmacology*; D047188:Chalcones; D004305:Dose-Response Relationship, Drug; D066298:In Vitro Techniques; D007537:Isometric Contraction / Q000187:drug effects; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009129:Muscle Tonus / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D007703:Peptidyl-Dipeptidase A / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D014662:Vasoconstrictor Agents / Q000037:antagonists & inhibitors / Q000494:pharmacology
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D000959:Antihypertensive Agents; D047188:Chalcones; D014662:Vasoconstrictor Agents; D000804:Angiotensin II; C040918:butein; D002599:Chalcone; D000803:Angiotensin I; D007703:Peptidyl-Dipeptidase A