Effects of McN-A-343, a cholinomimetic drug, on endplate currents in the frog
| Autor: | Edward G. Henderson, J. J. Lambert, Robert L. Volle, K. Alkadhi, D. D. Branisteanu |
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| Rok vydání: | 1980 |
| Předmět: |
Atropine
Time Factors Dimethylphenylpiperazinium Neuromuscular Junction Neuromuscular transmission In Vitro Techniques Receptors Nicotinic Synaptic Transmission Ion Channels Decamethonium Muscarinic acetylcholine receptor medicine Animals Acetylcholine receptor Pharmacology Neuromuscular Blockade Dose-Response Relationship Drug Chemistry Rana pipiens (4-(m-Chlorophenylcarbamoyloxy)-2-butynyl)trimethylammonium Chloride Depolarization General Medicine Quaternary Ammonium Compounds Nicotinic agonist Parasympathomimetics embryonic structures cardiovascular system Biophysics Anura Dimethylphenylpiperazinium Iodide Neuroscience circulatory and respiratory physiology medicine.drug |
| Zdroj: | Naunyn-Schmiedeberg's Archives of Pharmacology. 312:117-121 |
| ISSN: | 1432-1912 0028-1298 |
| DOI: | 10.1007/bf00569719 |
| Popis: | The muscarinic ganglion stimulating agent, McN-A-343 has unusual blocking actions on endplate currents (EPCs) at frog neuromuscular junctions. McN-A-343 caused depolarization by a curare-sensitive process, blocked neuromuscular transmission, depressed EPCs and reduced the time for EPC decay. These results are explained best by a nicotinic agonist action of McN-A-343 on the acetylcholine receptor to cause ion flow and the blockade by McN-A-343 of the open ion channels. The actions of McN-A-343 are similar to those of decamethonium (C-10) described by others. Unlike C-10, however, McN-A-343 did not alter the exponential character of the EPC or alter the voltage dependency of the EPC. The prototypical nicotinic agonist, dimethylphenylpiperazinium had no effect on EPC parameters of endplate clamped at -90mV. |
| Databáze: | OpenAIRE |
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