Type

Journal Article

Authors

Noel G McHale
Keith D. Thornbury
K. D. Cotton
Mark A Hollywood

Subjects

Veterinary

Topics
science lymphatic vessels sheep whole cell patch clamp technique smooth muscle cells sodium chloride action potentials steady state

Tetrodotoxin-sensitive sodium current in sheep lymphatic smooth muscle. (1997)

Abstract Fast inward currents were elicited in freshly isolated sheep lymphatic smooth muscle cells by depolarization from a holding potential of -80 mV using the whole-cell patch-clamp technique. The currents activated at voltages positive to -40 mV and peaked at 0 mV. 2. When sodium chloride in the bathing solution was replaced isosmotically with choline chloride inward currents were abolished at all potentials. 3. These currents were very sensitive to tetrodotoxin (TTX). Peak current was almost abolished at 1 microM with half-maximal inhibition at 17 nM. 4. Examination of the voltage dependence of steady state inactivation showed that more than 90% of the current was available at the normal resting potential of these cells (-60 mV). 5. The time course of recovery from inactivation was studied using a double-pulse protocol and showed that recovery was complete within 100 ms with a time constant of recovery of 20 ms. 6. Under current clamp, action potentials were elicited by depolarizing current pulses. These had a rapid upstroke and a short duration and could be blocked with 1 microM TTX. 7. Spontaneous contractions of isolated rings of sheep mesenteric lymphatic vessels were abolished or significantly depressed by 1 microM TTX.
Collections Ireland -> Dundalk IT -> Subject = Science
Ireland -> Dundalk IT -> Open Access DRIVERset
Ireland -> Dundalk IT -> Status = Published
Ireland -> Dundalk IT -> Type = Article

Full list of authors on original publication

Noel G McHale, Keith D. Thornbury, K. D. Cotton, Mark A Hollywood

Experts in our system

1
Noel G McHale
Dundalk IT
Total Publications: 35
 
2
Keith D. Thornbury
Dundalk IT
Total Publications: 27
 
3
Mark A Hollywood
Dundalk IT
Total Publications: 35