Oxotremorine Acts as a Partial Nicotinic Agonist on Cultured Chick Myotubes

Abstract
Oxotremorine, a compound widely used as a muscarinic agonist, was found to inhibit binding of 125I-.alpha.-bungarotoxin to chick myotube nicotine acetylcholine receptors, IC50 = 79 .+-. 5 .mu.M. Oxotremorine also induced a d-tubocurarine sensitive influx of 86Rb in the myotubes (EC50 = 50 .+-. 15 .mu.M). Comparative ion-influx studies with carbachol suggested a partial agonist mode of action of oxotremorine.