Pancuronium, vecuronium, and d-tubocurarine inhibit and succinylcholine stimulates choline acetyltransferase activity

Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie
J R KambamB V Sastry


The effects of the nondepolarizing muscle relaxants (NDMR), pancuronium, vecuronium, and d-tubocurarine and a depolarizing muscle relaxant, succinylcholine, were studied on choline acetyltransferase (ChAT) activity. A radiochemical assay was used in the determination of ChAT activity using purified placental enzyme. Pancuronium at concentrations of 10(-7) M, 10(-6) M, 10(-5) M, 10(-4) M, and 10(-3) M inhibited ChAT activity by 3, 10, 15, 40 and 85 per cent, respectively; vecuronium at concentrations of 10(-6) M, 10(-5) M, 10(-4) M, and 10(-3) M inhibited ChAT activity by 5, 10, 26 and 57 per cent, respectively; d-tubocurarine at concentrations of 10(-6) M, 10(-5) M, 10(-4) M, and 10(-3) M inhibited ChAT activity by 0, 4, 12.5 and 29 per cent, respectively; whereas succinylcholine at concentrations of 10(-7) M, 10(-6) M, 10(-5) M, and 10(-4) M activated ChAT activity by 8, 10, 1, and 2 per cent, respectively. Even though our present data demonstrated a significant dose-dependent inhibitory effect on ChAT activity by pancuronium, vecuronium and d-tubocurarine, it is unlikely that this inhibitory effect will contribute to the mechanism of action of NDMR. Our data, however, may suggest an additional mechanism for the phenomena of t...Continue Reading


Sep 1, 1976·The Journal of Physiology·P R Adams
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Related Concepts

Carbon Radioisotopes
Choline O-Acetyltransferase
Dose-Response Relationship, Drug
Ion Exchange Resins
Pancuronium Curamed
Regression Analysis
Tubocurarine Chloride
Vecuronium Bromide, Quaternary Ion

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