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Anesthesia & Analgesia, Vol 82, 1211-1214, Copyright © 1996 by International Anesthesia Research Society

GENERAL ARTICLES

Anticholinesterase drugs stimulate phosphatidylinositol response in rat tracheal slices

O Shibata, M Kanairo, S Zhang, H Hasuo, H Morooka, T Fujie and K Sumikawa
Department of Anesthesiology, Nagasaki University School of Medicine, Japan.

Some anticholinesterase (anti-ChE) drugs induce airway smooth muscle contraction. Whether anti-ChE drugs stimulate muscarinic receptors in airway smooth muscle as well as nicotinic receptors in neuromuscular junction is unknown. Since there is a direct relationship between phosphatidylinositol (PI) response and airway smooth muscle contraction induced by muscarinic agonists, we examined the effects of neostigmine, physostigmine, pyridostigmine, and edrophonium on PI response in the airway smooth muscle. The rat tracheal slices were incubated in Krebs- Henseleit solution containing LiCl and [3H]myo-inositol in the presence of carbachol, anti-ChE, or none of them. [3H]inositol monophosphate (IP1), which is a degradation product of PI response, was counted with a liquid scintillation counter. Inositol monophosphate accumulation was stimulated by neostigmine, physostigmine, and pyridostigmine in a dose- dependent manner, but was not affected by edrophonium. These increases were completely inhibited by atropine. The results suggest that neostigmine, physostigmine, and pyridostigmine stimulate PI response in the airway smooth muscle, which would cause bronchoconstriction, while edrophonium does not affect PI response.


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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1996 by the International Anesthesia Research Society.