title: An investigation of the effects of a pyridyl and a piperidyl 1, 3-dioxolane derivative on neuromuscular transmission.
abstract: 2-(4'-pyridyl)-1,3-dioxolane methiodide (KCL-301-14) and 2-(1'-methyl-4' piperidyl)-1,3-dioxolane hydroiodide (KCL-301-39) facilitated the force of contraction in low doses and blocked it in higher doses in the in vivo cat soleus muscle preparation. Both drugs in the cat also reversed d-tubocurarine and succinylcholine blockade, produced post-drug repetitive activity, blocked post-tetanic potentiation (PTP), had no direct muscle affect and reversed the PTP suppression caused by d-tubocurarine and succinylcholine. In the rat phrenic nerve-diaphragm and the chick biventer cervicis preparations in vitro, facilitation, then blockade of the contraction were seen as concentrations increased. However, KCL-301-14 reversed d-tubocurarine and increased succinylcholine blockades in the rat and chick. KCl-301-39 increased both d-tubocurarine and succinylcholine blockades in the rat and chick. The different effects seen in the cat vs. the rat and chick with these drugs are probably due to species variation.
mesh_terms: D000818:Animals; D002415:Cats; D002642:Chick Embryo; D003964:Diaphragm / Q000187:drug effects; D004148:Dioxolanes / Q000494:pharmacology*; D004149:Dioxoles / Q000494:pharmacology*; D004491:Edrophonium / Q000494:pharmacology; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects; D009132:Muscles / Q000187:drug effects*; D010791:Phrenic Nerve / Q000187:drug effects; D051381:Rats; D013390:Succinylcholine / Q000037:antagonists & inhibitors; D009435:Synaptic Transmission / Q000187:drug effects*; D014403:Tubocurarine / Q000037:antagonists & inhibitors
chemical_list: D004148:Dioxolanes; D004149:Dioxoles; D004491:Edrophonium; D013390:Succinylcholine; D014403:Tubocurarine