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The mechanism of action of murexine on neuromuscular transmission in the frog
Murexine (urocanoylcholine, [2-β-imidazol-4(5)-ylacryloyloxyethyl]trimethylammonium chloride hydrochloride) produced a contracture like acetylcholine in the frog rectus and a neuromuscular block in the rat diaphragm which was not relieved by neostigmine but was antagonized by hexamethonium. Using th...
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| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
1957
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| Online Zugang: | https://ncbi.nlm.nih.gov/pmc/articles/PMC1509708/ https://ncbi.nlm.nih.gov/pubmed/13460249 |
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| Zusammenfassung: | Murexine (urocanoylcholine, [2-β-imidazol-4(5)-ylacryloyloxyethyl]trimethylammonium chloride hydrochloride) produced a contracture like acetylcholine in the frog rectus and a neuromuscular block in the rat diaphragm which was not relieved by neostigmine but was antagonized by hexamethonium. Using the foot muscle of the frog, electrical recordings showed that murexine produced a neuromuscular block and depolarized the end-plate region. These effects were similar to those seen with suxamethonium, decamethonium and acetylcholine. While murexine had the same depolarizing potency as decamethonium, it was only one-tenth as active as suxamethonium and acetylcholine. It was concluded that murexine could be classified as a “depolarizing type” of neuromuscular blocking agent but was less potent than suxamethonium. |
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