Journal article

Effects of Ca2 concentration and Ca2 channel blockers on noradrenaline release and purinergic neuroeffector transmission in rat tail artery

JA Brock, TC Cunnane

BRITISH JOURNAL OF PHARMACOLOGY | STOCKTON PRESS | Published : 1999

Abstract

1. The effects of Ca2+ concentration and Ca2+ channel blockers on noradrenaline (NA) and adenosine 5'-triphosphate (ATP) release from postganglionic sympathetic nerves have been investigated in rat tail arteries in vitro. Intracellularly recorded excitatory junction potentials (e.j.ps) were used as a measure of ATP release and continuous amperometry was used to measure NA release. 2. Varying the extracellular Ca2+ concentration similarly affected the amplitudes of e.j.ps and NA-induced oxidation currents evoked by trains of ten stimuli at 1 Hz. 3. The N-type Ca2+ blocker, omega-conotoxin GVIA (omega-CTX GVIA, 0.1 microM) reduced the amplitudes of both e.j.ps (evoked by trains of ten stimuli ..

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