アブストラクト(23巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : Bradykininによるイヌ摘出舌動脈の収縮作用機構に関する薬理学的研究
Subtitle : 原著
Authors : 小池淳美, 伊藤春生
Authors(kana) :
Organization : 神奈川歯科大学薬理学教室
Journal : 神奈川歯学
Volume : 23
Number : 1
Page : 15-24
Year/Month : 1988 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」舌, 歯肉, 頬粘膜および歯髄に代表される口腔内組織の微小循環調節にはkinin類が密接に関係している. とくに, bradykinin(BK)が口腔内微小循環単位で, 周囲循環系とは独立した局所循環調節のkey mediatorとして中心的役割を演じているとする我々の研究室の一連の報告は, 口腔内への供給血管に, BKに対する反応特異性が存在する可能性を示唆している. 事実, 小池らは, BKがイヌ摘出肺動脈, 腸間膜動脈および総頸動脈を弛緩させるのに反し, 舌動脈を強く収縮させることを見い出した. そして, BKによる肺動脈, 腸間膜動脈および総頸動脈の弛緩が内皮細胞依存性であったにもかかわらず, 舌動脈の収縮は内皮細胞の有無に関係なくみられることから, BKによる舌動脈収縮作用が, 平滑筋細胞そのものに対するBK受容体を介したCa2+流入機構によってもたらされると仮定した. しかし, BKによる舌動脈の収縮が, 最終的にCa2+流入増加に依存したものであるにしろ, α1-受容体を介する収縮反応段階および収縮性prostaglandins合成系を介する内皮細胞非依存性反応段階を経由してもたらされる可能性も否定できない.
Practice : 歯科学
Keywords : bradykinin, 舌動脈, Ca+2 channel, Na+, K+ -ATPase, Na+ -Ca2+交換

English

Title : Pharmacological Study on The Mechanism of The Contractile Effect of Bradykinin on Isolated Canine Lingual Artery
Subtitle : Original article
Authors : Atsumi KOIKE, Haruo Ito
Authors(kana) :
Organization : Department of Pharmacology, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 23
Number : 1
Page : 15-24
Year/Month : 1988 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : This study was designed to investigate the possible mechanism of the contractile effect of bradykinin (BK) on ring cut strips of canine lingual artery. Phentolamine, prazosin or yohimbine at the concentrations which inhibited norepinephrine (NE)-induced contraction of lingual artery had no effect on the BK-induced contraction of the artery. Verapamil or nifedipine, a Ca2+ antagonist, completely abolished the Ca2+ -contracture of K+ -depolarized artery, and partially inhibited the NE- or BK-induced contraction of the artery. When K+ -depolarized artery was incubated in a Ca2+ -free solution, the contraction induced by BK was completely suppressed. The contractile effect of BK was potentiated when Na+, K+ -ATPase activity of the vascular smooth muscle cells had been inhibited by ouabain, K+ -free solution or by low-Na+ solution. Furthermore, the effect of BK was not or only slightly potentiated by B1-kinin antagonists (des-Arg9-[Leu8]-BK and[Thi5,8, D-Phe7]-BK) ; and B1-kinin agonist, des-Arg9-BK, caused concentration-related relaxation of lingual artery. Indomethacin failed to significantly alter the BK-induced concentration-related contraction of the artery. The present results suggest that contractile responses of canine lingual artery to BK do not appear to derived from prostaglandins released, and that the effect of BK is thought to represent Ca2+ entry from B2-kinin receptor operated Ca2+ channel, but not via B1-kinin or α-receptor, and seems to be in part responsible for the stimulation of Na+ -Ca2+ exchange mechanism via inhibition of Na+, K+ -ATPase activity.
Practice : Dentistry
Keywords : bradykinin, Ca+2 channel, Na+, K+ -ATPase,