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Neural modulation of gut motility by the myomodulin peptides and acetylcholine in the snail Lymnaea

journal contribution
posted on 2023-06-07, 19:10 authored by S J Perry, V A Straub, George KemenesGeorge Kemenes, N Santama, B M Worster, J F Burke, P R Benjamin
Families of peptide neuromodulators are believed to play important roles in neural networks that control behaviors. Here, we investigate the expression and role of one such group of modulators, the myomodulins, in the feeding system of Lymnaea stagnalis. Using a combination of in situ hybridization and antibody staining, expression of the myomodulin gene was confirmed in a number of identified behaviorally significant neuronal types, including the paired B2 motor neurons. The B2 cells were shown to project axons to the proesophagus, where they modulate foregut contractile activity. The presence of the five myomodulin peptide structures was confirmed in the B2 cells, the proesophagus, and the intervening nerve by mass spectrometry. Using a sensitive cell culture assay, evidence that the B2 cells are cholinergic also is presented. Application of four of the five myomodulin peptides to the isolated foregut increased both contraction frequency and tonus, whereas the main effect of acetylcholine (ACh) application was a large tonal contraction. The fifth myomodulin peptide (pQIPMLRLamide) appeared to have little or no effect on gut motility. Coapplication of all five myomodulin peptides gave a greater increase in tonus than that produced by the peptides applied individually, suggesting that corelease of the peptides onto the gut would produce an enhanced response. The combined effects that the myomodulin peptides and ACh have on foregut motility can mimic the main actions of B2 cell stimulation.

History

Publication status

  • Published

Journal

Journal of Neurophysiology

ISSN

0022-3077

Publisher

Journal of Neurophysiology

Issue

5

Volume

79

Page range

2460-2474

Pages

15.0

ISBN

0022-3077

Department affiliated with

  • Neuroscience Publications

Notes

Available at: http://jn.physiology.org/cgi/content/full/79/5/2460

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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