title: [Relationship between the positive inotropic action of matrine and extracellular calcium].
abstract: Matrine (Ma) was extracted from the seed and leaves of Sophora alopecuroides L. Ma showed positive inotropic actions in isolated guinea pig left atrium and rat vas deferens under electric stimulation. The positive inotropic actions were markedly inhibited by verapamil (1 mumol/L). Isolated rat vas deferens under the action of Ma showed rhythmic contraction. High K+ (KCl 40 mmol/L) augmented the frequency of rhythmic contraction induced by Ma; conversely, Ma may also augment the increased tension produced by high K+. These results suggest that, the positive inotropic actions of Ma is relevant to its activation of Ca2+ channels.
authors.affiliation: Department of Pharmacology, Neimenggu Medical College, Huhehaote.
authors.forename: S S
authors.initials: SS
authors.lastname: Zhang
authors.forename: Z H
authors.initials: ZH
authors.lastname: Li
authors.forename: S F
authors.initials: SF
authors.lastname: Liu
mesh_terms: D000470:Alkaloids / Q000494:pharmacology*; D000818:Animals; D015220:Calcium Channels / Q000187:drug effects; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects*; D011807:Quinolizines; D051381:Rats; D013268:Stimulation, Chemical; D014649:Vas Deferens / Q000187:drug effects; D014700:Verapamil / Q000494:pharmacology; D000093842:Matrines
chemical_list: D000470:Alkaloids; D015220:Calcium Channels; D011807:Quinolizines; D014700:Verapamil; D000093842:Matrines