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https://hdl.handle.net/2440/11940
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Type: | Journal article |
Title: | Excitation of rat colonic afferent fibres by 5-HT3 receptors |
Author: | Hicks, G. Coldwell, J. Schindler, M. Bland Ward, P. Jenkins, D. Lynn, P. Humphrey, P. Blackshaw, L. |
Citation: | The Journal of Physiology, 2002; 544(3):861-869 |
Publisher: | Cambridge Univ Press |
Issue Date: | 2002 |
ISSN: | 0022-3751 1469-7793 |
Statement of Responsibility: | Gareth A Hicks, Jonathan R Coldwell, Marcus Schindler, Philip A Bland Ward, David Jenkins, Penny A Lynn, Patrick P A Humphrey, and L Ashley Blackshaw |
Abstract: | The gastrointestinal tract contains most of the body's 5-hydroxytryptamine (5-HT) and releases large amounts after meals or exposure to toxins. Increased 5-HT release occurs in patients with irritable bowel syndrome (IBS) and their peak plasma 5-HT levels correlate with pain episodes. 5-HT(3) receptor antagonists reduce symptoms of IBS clinically, but their site of action is unclear and the potential for other therapeutic targets is unexplored. Here we investigated effects of 5-HT on sensory afferents from the colon and the expression of 5-HT(3) receptors on their cell bodies in the dorsal root ganglia (DRG). Distal colon, inferior mesenteric ganglion and the lumbar splanchnic nerve bundle (LSN) were placed in a specialized organ bath. Eighty-six single fibres were recorded from the LSN. Three classes of primary afferents were found: 70 high-threshold serosal afferents, four low-threshold muscular afferents and 12 mucosal afferents. Afferent cell bodies were retrogradely labelled from the distal colon to the lumbar DRG, where they were processed for 5-HT(3) receptor-like immunoreactivity. Fifty-six percent of colonic afferents responded to 5-HT (between 10(-6) and 10(-3) M) and 30 % responded to the selective 5-HT(3) agonist, 2-methyl-5-HT (between 10(-6) and 10(-2) M). Responses to 2-methyl-5-HT were blocked by the 5-HT(3) receptor antagonist alosetron (2 x 10(-7) M), whereas responses to 5-HT were only partly inhibited. Twenty-six percent of L1 DRG cell bodies retrogradely labelled from the colon displayed 5-HT(3) receptor-like immunoreactivity. We conclude that colonic sensory neurones expressing 5-HT(3) receptors also functionally express the receptors at their peripheral endings. Our data reveal actions of 5-HT on colonic afferent endings via both 5-HT(3) and non-5-HT(3) receptors. |
Keywords: | Colon Ganglia, Spinal Nerve Fibers Neurons, Afferent Animals Rats Rats, Sprague-Dawley Serotonin Receptors, Serotonin Receptors, Serotonin, 5-HT3 Serotonin Antagonists Immunohistochemistry |
DOI: | 10.1113/jphysiol.2002.025452 |
Published version: | http://dx.doi.org/10.1113/jphysiol.2002.025452 |
Appears in Collections: | Aurora harvest 7 Physiology publications |
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