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Article

Localisation of cannabinoid CB1 receptor immunoreactivity in the guinea pig and rat myenteric plexus

Angela A. Coutts

Corresponding Author

E-mail address: [email protected]

Department of Biomedical Sciences, University of Aberdeen, Aberdeen, Scotland AB25 2ZD, United Kingdom

Department of Biomedical Sciences, Institute of Medical Sciences, University of Aberdeen, Scotland AB25 2ZD, United Kingdom
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Andrew J. Irving

Department of Pharmacology and Neuroscience, University of Dundee, Dundee, Scotland DD1 9SY, United Kingdom

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Ken Mackie

Department of Anesthesiology, University of Washington, Seattle, Washington 98195

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Roger G. Pertwee

Department of Biomedical Sciences, University of Aberdeen, Aberdeen, Scotland AB25 2ZD, United Kingdom

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Sharon Anavi‐Goffer

Department of Biomedical Sciences, University of Aberdeen, Aberdeen, Scotland AB25 2ZD, United Kingdom

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First published: 28 May 2002
Cited by: 92

Abstract

Activation of cannabinoid CB1 receptors inhibits gastrointestinal motility, propulsion, and transit, whereas selective antagonism of these receptors has the opposite effects, suggesting the presence of endocannabinoid tone. Supporting evidence for presynaptic CB1 receptors on myenteric neurons has been found in vitro. In this study, selective CB1 receptor antibodies and neuronal markers were used to identify and characterise myenteric neurons expressing cannabinoid receptors. Whole mounts of rat and guinea pig myenteric preparations were dually labelled with antibodies against the CB1 receptor and choline acetyltransferase, neurofilament proteins, calbindin, calretinin, synapsin I, microtubule‐associated protein‐2, calcitonin gene‐related peptide, or substance P. The pattern of CB1 receptor labelling and the neurochemical classification of CB1 receptor‐positive cells were markedly influenced by the species and fixation procedure. Virtually all choline acetyltransferase‐immunoreactive myenteric neurons expressed CB1 receptors in ganglia from both species. Subpopulations of neurons identified with calbindin, calretinin, and microtubule‐associated protein‐2 did not express CB1 receptors. A few calcitonin gene‐related peptide‐ and substance P‐positive somata coexpressed CB1 receptor immunoreactivity but showed little colocalisation on individual fibres. There was a close association between CB1 receptor immunoreactivity and fibres labelled for synaptic protein, suggesting a role in the modulation of transmitter release. Functional responses to cannabinoids in the presence of hexamethonium suggest further that CB1 receptors occur on excitatory motoneurons. In conclusion, CB1 receptors are expressed on a variety of cholinergic sensory, interneuronal, and motor neurons in myenteric ganglia. J. Comp. Neurol. 448:410–422, 2002. © 2002 Wiley‐Liss, Inc.

Number of times cited according to CrossRef: 92

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