title: Electrophysiological effects of methyl 3-O-methyl gallate on single muscle fibres.
abstract: The electrophysiological changes induced by methyl 3-O-methyl gallate, a substance extracted from Crinodendron hookerianum, have been studied on 32 muscle fibres of Pleurodema thaul. Four concentrations were used: 1 x 10(-5), 2 x 10(-5), 1 x 10(-4), and 2 x 10(-4) mol/l, the results being a reversible dose-dependent reduction of the overshoot and the amplitude of the action potential, a prolongation of the rise and decay times of the spike, as well as a depolarization of the resting membrane potential. An explanation of these results by a blockade of the potassium and possibly the sodium channels in the cellular membrane is discussed.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001001:Anura; D004594:Electrophysiology; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D009132:Muscles / Q000187:drug effects*; D011188:Potassium / Q000502:physiology; D012964:Sodium / Q000502:physiology
chemical_list: C022188:M3OMG; D005707:Gallic Acid; D012964:Sodium; D011188:Potassium