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Immunohistochemical localisation of pre-synaptic muscarinic receptor subtype-2 (M2r) in the enteric nervous system of guinea-pig ileum

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Abstract

The cholinergic muscarinic 2 receptor (M2r) is known to be present on smooth muscle cells in the intestine. Pharmacological studies also suggest that M2rs regulate transmitter release from nerves in the enteric nervous system. This study localised M2rs in the guinea-pig ileum using different antibodies and fluorescence immunohistochemistry. Double labelling with antibodies against neurochemical markers was used to identify the type of nerves bearing M2r. Guinea-pig ileum were fixed, prepared for sections and wholemounts and incubated with antisera against the M2r sequence. Tissue was double labelled with antibodies against neuronal nitric oxide synthase (nNOS), common choline acetyltransferase (cChAT), substance P (SP), synaptophysin and vesicular acetylcholine transporter (VAChT). Immunofluorescence was viewed using confocal microscopy. Abundant M2r-immunoreactivity (IR) was present on the surface of circular and longitudinal smooth muscle cells. M2r-IR was present in many but not all nerve fibres in the circular muscle and ganglia. M2r-IR was present in VAChT-IR and cChAT-IR cholinergic nerve fibres and SP-IR nerve fibres in the myenteric ganglia and submucosal ganglia. M2r-IR was present on a few nNOS-IR nerve fibres and around nNOS-IR neurons in the myenteric ganglia. In the circular muscle and deep muscular plexus, M2r-IR was present in many VAChT-IR and SP-IR nerve fibres and in few nNOS-IR nerves. M2rs are not only present on muscle cells in the intestine, but also on nerve fibres. M2rs may mediate cholinergic reflexes via their location on muscle and also via neural transmission. The pre-synaptic location supports pharmacological studies suggesting M2rs mediate neurotransmitter release from nerve fibres. The presence of M2rs on VAChT-IR, SP-IR and nNOS-IR-containing nerve fibres suggests M2rs may regulate ACh, SP and nitric oxide release.

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Acknowledgments

The authors thank Pam Farmer, Carl Kirkwood, Karen Boniface and Jack Wood for technical advice, Cristal Peck for her artistry, and Magdy Sourial for animal handling.

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Authors and Affiliations

  1. Surgical Research and Gut Motility Laboratory, Murdoch Children’s Research Institute, Royal Children’s Hospital, Level 8, AP Building, Parkville, 3052, Australia

    A. M. Harrington, J. M. Hutson & B. R. Southwell

  2. Department of Paediatrics, University of Melbourne, Parkville, 3052, Australia

    A. M. Harrington & J. M. Hutson

  3. Departments of General Surgery and Urology, Royal Children’s Hospital, Parkville, 3052, Australia

    J. M. Hutson

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  1. A. M. Harrington
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  2. J. M. Hutson
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  3. B. R. Southwell
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Correspondence to B. R. Southwell.

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Work in this study was funded by the National Health and Medical Research Council (grant numbers: 114215 and 216704; Senior Research Fellowship to B.S.), a Melbourne University Research Scholarship and the Murdoch Children’s Research Institute.

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Harrington, A.M., Hutson, J.M. & Southwell, B.R. Immunohistochemical localisation of pre-synaptic muscarinic receptor subtype-2 (M2r) in the enteric nervous system of guinea-pig ileum. Cell Tissue Res 332, 37–48 (2008). https://doi.org/10.1007/s00441-007-0533-0

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