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Nondepolarizing neuromuscular blockers inhibit the serotonin-type 3A receptor expressed in Xenopus oocytes.

 Kyeong T. Min  ;  Christopher L. Wu  ;  Jay Yang 
 Anesthesia and Analgesia, Vol.90(2) : 476-481, 2000 
Journal Title
 Anesthesia and Analgesia 
Issue Date
Animals ; In Vitro Techniques ; Ion Channel Gating/drug effects ; Mice ; Neuromuscular Nondepolarizing Agents/pharmacology* ; Oocytes/metabolism ; Patch-Clamp Techniques ; RNA, Messenger/biosynthesis ; Receptor Cross-Talk/drug effects ; Receptors, Serotonin/biosynthesis ; Receptors, Serotonin/drug effects* ; Receptors, Serotonin, 5-HT3 ; Serotonin/pharmacology ; Serotonin Antagonists/pharmacology* ; Xenopus
Molecular cloning and sequence comparison indicates a high degree of structural homology between muscle nicotinic acetylcholine (nACh) and serotonin-type 3 (5-HT(3A)) receptors, both members of the direct ligand-gated family of ion channels. Because of the structural similarities and common evolutionary origin of these receptors, neuromuscular blockers (competitive nACh antagonists) may demonstrate pharmacologic cross talk and exhibit attributes of 5-HT(3A) receptor antagonists. We examined six clinically-used neuromuscular blockers for their ability to antagonize currents flowing through the 5-HT(3A) receptors in voltage clamped Xenopus oocytes. The neuromuscular blockers reversibly inhibited the 5-HT(3A) receptor-gated current in the rank order potency of (IC50 mean +/- SEM): d-tubocurarine (0.046 +/- 0.003 microM), atracurium (0.40 +/- 0.03 microM), mivacurium (15.1 +/- 2.93 microM), vecuronium (16.3 +/- 2.24 microM), and rocuronium (19.5 +/- 2.31 microM). Gallamine was essentially inactive as a 5-HT(3A) receptor antagonist with an extrapolated IC50 of 1170 microM. We demonstrate that drugs classically known as competitive nACh receptor antagonists also block 5-HT(3A) receptors. It is likely that certain neuromuscular blockers share pharmacological properties with 5-HT(3A) receptor antagonists, such as a reduction in postoperative nausea and vomiting. With careful drug selection, pharmacological cross talk could potentially be used to minimize polypharmacy and optimize patient management. IMPLICATIONS: Muscle nicotinic acetylcholine and serotonin-type 3A (5-HT(3A)) receptors are similar. Therefore neuromuscular relaxants may block 5-HT(3A) receptors. Our pharmacological study demonstrates that neuromuscular relaxants, as with ondansetron, are 5-HT(3A) receptor antagonists. It is likely that certain neuromuscular relaxants exhibit ondansetron-like clinical properties, such as reduction in postoperative nausea and vomiting.
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1. College of Medicine (의과대학) > Dept. of Anesthesiology and Pain Medicine (마취통증의학교실) > 1. Journal Papers
Yonsei Authors
Min, Kyeong Tae(민경태) ORCID logo https://orcid.org/0000-0002-3299-4500
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