relation: http://publicatio.bibl.u-szeged.hu/31983/
title: EFFECTS OF VERATRIDINE ON NA AND CA CURRENTS IN FROG SKELETAL-MUSCLE
creator:  Nánási Péter Pál
creator:  Varró András
creator:  Lathrop David A.
creator:  Bryant Shirley H.
subject: 01.06. Biológiai tudományok
subject: 03.01. Általános orvostudomány
description: 1. Voltage-clamp experiments were performed to determine the effects of veratridine on Na and Ca currents in frog skeletal muscle fibres. 2. Veratridine (1 mu M) did not affect the kinetics of the fast Na current but it did induce a slowly inactivating tetrodotoxin-sensitive inward current that was apparent after Na current inactivation. This slow current had a peak amplitude of 6.7 +/- 0.7 mu A/cm(2) at -20 mV and decayed monoexponentially with a time constant of 606 +/- 77 ms. 3. The slow current had a voltage-dependence for activation that was similar to that of the fast Na current. Single depolarizing prepulses that induced complete inactivation of the fast Na channels, prevented development of the slow current. Trains of brief depolarizations at increasing frequencies increased the amplitude of the slow current. These results suggest that the slow current may be mediated by veratridine modified Na channels that must be in the open position. 4. The low concentration of veratridine (1 mu M) did not affect the Ca current, while 100 mu M veratridine reversibly suppressed the Ca current and shifted its peak current-voltage relation towards more negative potentials. Thus, veratridine appears not to be a selective fast Na channel modifier as it may also alter Ca channel gating properties in skeletal muscle fibres.
date: 1994
type: Folyóiratcikk
type: PeerReviewed
format: text
identifier: http://publicatio.bibl.u-szeged.hu/31983/1/aok_klny_103_94.pdf
identifier:     Nánási Péter Pál;  Varró András;  Lathrop David A.;  Bryant Shirley H.: EFFECTS OF VERATRIDINE ON NA AND CA CURRENTS IN FROG SKELETAL-MUSCLE.   GENERAL PHARMACOLOGY - THE VASCULAR SYSTEM, 25 (8).  pp. 1661-1666.  ISSN 0306-3623 (1994)     
identifier: doi:10.1016/0306-3623(94)90369-7
relation: https://doi.org/10.1016/0306-3623%2894%2990369-7
relation: 1132526
language: eng