title: Effects of Bay K 8644 on the spontaneous electrical and mechanical activities of the rat portal vein.
abstract: Effects of Bay K 8644 on the spontaneous electrical and mechanical activities of the rat portal vein were studied. Bay K 8644 enhanced contractions in amplitude and duration. Bay K 8644 prolonged the duration of the spontaneous spike potential bursts and increased the number of spike potentials in a burst. These results indicate that the increase in the amplitude and duration of spontaneous contractions of the rat portal vein induced by Bay K 8644 are mediated mainly by the facilitation of the membrane electrical activity.
authors.affiliation: Research Institute of Hypertension, Kinki University, Osaka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shimamura
authors.forename: S
authors.initials: S
authors.lastname: Sunano
mesh_terms: D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Q000494:pharmacology*; D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001696:Biomechanical Phenomena; D066298:In Vitro Techniques; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D009543:Nifedipine / Q000494:pharmacology; D011169:Portal Vein / Q000187:drug effects*; D051381:Rats; D011921:Rats, Inbred WKY; D014661:Vasoconstriction / Q000187:drug effects*
chemical_list: D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester; D009543:Nifedipine