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Segmental differences in the non-neuronal cholinergic system in rat caecum

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Abstract

Acetylcholine is not only a neurotransmitter but is also produced by several non-neuronal cell types with barrier or defence function. One of the non-neuronal tissues with expression of the key enzyme for production of acetylcholine, the choline acetyltransferase (ChAT), is the colonic surface epithelium, which releases acetylcholine after contact with the short-chain fatty acid propionate produced physiologically in the colonic lumen during the microbial fermentation of carbohydrates. Despite the fact that the caecum is the largest fermentation chamber in non-ruminant mammals, nothing is known about the expression and function of a non-neuronal cholinergic system in this part of the large intestine, which was addressed in the present study. In Ussing chamber experiments, propionate induced a concentration-dependent Cl− secretion leading to an increase in short-circuit current (Isc), which was stronger in the aboral part (near the blind ending sac of the caecum) compared to the oral part of caecum. The propionate-induced Isc was blocked by atropine, but was resistant against tetrodotoxin, conotoxins (MVIIC and SVIB) or hexamethonium indicating that propionate acts via non-neuronal acetylcholine. Immunohistochemical staining revealed the expression of ChAT in the caecal surface epithelium with a significant gradient between aboral (high) and oral (low) expression. This difference combined with a higher efficiency of cholinergically induced anion secretion (as revealed by the Isc evoked by the cholinergic agonist carbachol) is probably responsible for the segment dependency of the response to propionate. In summary, propionate stimulates anion secretion in rat caecum via non-neuronal acetylcholine emphasizing the physiological importance of the non-neuronal cholinergic system in the communication between the gastrointestinal microbiome and the mammalian host.

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Acknowledgements

The diligent technical assistance of Mrs. Brigitta Brück, Bärbel Schmidt and Alice Stockinger is a pleasure to acknowledge.

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  1. Institute for Veterinary Physiology and Biochemistry, Justus Liebig University Giessen, Frankfurter Str. 100, Giessen, Germany

    Sandra Bader & Martin Diener

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  1. Sandra Bader
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  2. Martin Diener
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Correspondence to Martin Diener.

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Experiments were approved by the named animal welfare officers of the Justus Liebig University (administrative number 577_M) and performed according to the German and European animal welfare law.

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Bader, S., Diener, M. Segmental differences in the non-neuronal cholinergic system in rat caecum. Pflugers Arch - Eur J Physiol 470, 669–679 (2018). https://doi.org/10.1007/s00424-017-2104-x

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  • DOI: https://doi.org/10.1007/s00424-017-2104-x

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