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Eur J Pharmacol. 2018 Feb 5;820:39-44. doi: 10.1016/j.ejphar.2017.11.044. Epub 2017 Dec 2.

Inhalation anaesthetic isoflurane inhibits the muscarinic cation current and carbachol-induced gastrointestinal smooth muscle contractions.

Author information

1
Washington University School of Medicine in St. Louis, 660 South Euclid Avenue, St. Louis, MO, USA; A.A. Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv 01024, Ukraine; Institute of Pharmacology and Toxicology, Academy of Medical Sciences of Ukraine, 14 Eugene Pottier Street, Kyiv 03680, Ukraine.
2
Washington University School of Medicine in St. Louis, 660 South Euclid Avenue, St. Louis, MO, USA.
3
A.A. Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv 01024, Ukraine; Institute of Pharmacology and Toxicology, Academy of Medical Sciences of Ukraine, 14 Eugene Pottier Street, Kyiv 03680, Ukraine.
4
A.A. Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv 01024, Ukraine; ESC "Institute of Biology and Medicine", Taras Shevchenko Kyiv National University, 64/13 Volodymyrska Street, Kyiv 01601, Ukraine. Electronic address: a.zholos@univ.net.ua.

Abstract

Gastrointestinal tract motility may be demoted significantly after surgery operations at least in part due to anaesthetic agents, but there is no comprehensive explanation of the molecular mechanism(s) of such adverse effects. Anesthetics are known to interact with various receptors and ion channels including several subtypes of transient receptor potential (TRP) channels. Two members of the canonical subfamily of TRP channels (TRPC), TRPC4 and TRPC6 are Ca2+-permeable cation channels involved in visceral smooth muscle contractility induced by acetylcholine, the primary excitatory neurotransmitter in the gut. In the present study, we aimed to study the effect of anesthetics on muscarinic receptor-mediated excitation and contraction of intestinal smooth muscle. Here we show that muscarinic cation current (mICAT) mediated by TRPC4 and TRPC6 channels in mouse ileal myocytes was strongly inhibited by isoflurane (0.5mM), one of the most commonly used inhalation anesthetics. Carbachol-activated mICAT was reduced by 63 ± 11% (n = 5), while GTPγS-induced (to bypass muscarinic receptors) current was inhibited by 44 ± 9% (n = 6). Furthermore, carbachol-induced ileum and colon contractions were inhibited by isoflurane by about 30%. We discuss the main sites of isoflurane action, which appear to be G-proteins and muscarinic receptors, rather than TRPC4/6 channels. These results contribute to our better understanding of the signalling pathways affected by inhalation anesthetics, which may cause ileus, and thus may be important for the development of novel treatment strategies during postoperative recovery.

KEYWORDS:

Carbachol (PubChem CID: 5831); G-proteins; GTPγS (PubChem CID: 37792); Gastrointestinal smooth muscles; General anesthetics; Isoflurane; Isoflurane (PubChem CID: 3763); Muscarinic receptors; TRP channels

PMID:
29198958
PMCID:
PMC5767143
DOI:
10.1016/j.ejphar.2017.11.044
[Indexed for MEDLINE]
Free PMC Article

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