Abstract
To elucidate the roles played by the interstitial cells of Cajal in the myenteric layer (ICC-MY) in cholinergic neuromuscular transmission, we recorded mechanical and electrical activities in response to electrical field stimulation (EFS) of the ileal longitudinal muscle strips from WBB6F1-W/WV (W/WV) mutant mice, that lacked ICC-MY and compared with those in WBB6F1-+/+ (+/+) control mice. In +/+ muscle strips, EFS induced phasic contractions, which were abolished or strongly attenuated by atropine or tetrodotoxin. In W/WV preparations, EFS induced similar phasic contractions, but the cholinergic component was smaller than that in +/+ strips. This was despite of the fact that the contractions because of exogenous applications of carbachol and high K+ solution in W/WV strips were comparable to or rather greater than those in the +/+ preparations. EFS induced atropine-sensitive excitatory junction potentials (EJPs) in the +/+ longitudinal smooth muscle cells but not in W/WV cells. In the presence of eserine, EFS induced atropine-sensitive EJPs in W/WV cells. These results suggest that ICC-MY mediate the cholinergic neuromuscular transmission in mouse ileal longitudinal smooth muscles. In addition, the other pathway in which ICC-MY are not involved can operate concomitantly.
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Abbreviations
- ACh:
-
Acetylcholine
- CCh:
-
Carbamylcholine chloride
- EFS:
-
Electrical field stimulation
- EJP:
-
Excitatory junction potential
- ICC:
-
Interstitial cells of Cajal
- ICC-DMP:
-
ICC that exist in the deep muscular plexus
- ICC-MY:
-
ICC that exist in the myenteric plexus
- IJP:
-
Inhibitory junction potential
- PGP9.5:
-
Protein gene product 9.5
- TTX:
-
Tetrodotoxin
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Acknowledgments
This work was supported by the JSPS Research Fellows for Young Scientists (no. 203080) and JSPS KAKENHI grant nos. 22380159 and 25870891 from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Tanahashi, Y., Ichimura, Y., Kimura, K. et al. Cholinergic neuromuscular transmission mediated by interstitial cells of Cajal in the myenteric layer in mouse ileal longitudinal smooth muscles. Naunyn-Schmiedeberg's Arch Pharmacol 387, 377–388 (2014). https://doi.org/10.1007/s00210-013-0944-2
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DOI: https://doi.org/10.1007/s00210-013-0944-2