Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Role of TRPV1 in high-threshold rat colonic splanchnic afferents is revealed by inflammation|
|Citation:||Neuroscience Letters, 2009; 459(2):57-61|
|Publisher:||Elsevier Sci Ireland Ltd|
|Benjamin D. Phillis, Chris M. Martin, Daiwu Kang, Håkan Larsson, Erik A. Lindström, Vicente Martinez and L. Ashley Blackshaw|
|Abstract:||The vanilloid-1 receptor TRPV1 is known to play a role in extrinsic gastrointestinal afferent function. We investigated the role of TRPV1 in mechanosensitivity in afferents from normal and inflamed tissue. Colonic mechanosensitivity was determined in an in vitro rat colon preparation by recording from attached splanchnic nerves. Recordings were made from serosal/mesenteric afferents responding only at high thresholds to graded mechanical stimulation with von Frey probes. Colonic inflammation was induced by adding 5% dextran sulphate sodium (DSS) to the drinking water for 5 days, and was confirmed by histopathology. The selective TRPV1 antagonist, SB-750364 (10(-8) to 10(-6)M), was tested on mechanosensory stimulus response functions of afferents from normal and inflamed preparations (N=7 each). Mechanosensory responses had thresholds of 1-2g, and maximal responses were observed at 12 g. The stimulus response function was not affected by DSS-induced colitis. SB-750364 had no effect on stimulus response functions in normal preparations, but reduced (up to 60%) in a concentration-dependent manner those in inflammation (2-way ANOVA, p<0.05). Moreover, in inflamed tissue, spontaneous afferent activity showed a dose-dependent trend toward reduction with SB-750364. We conclude that mechanosensitivity of high-threshold serosal colonic splanchnic afferents to graded stimuli is unaffected during DSS colitis. However, there is a positive influence of TRPV1 in mechanosensitivity in inflammation, suggesting up-regulation of excitatory TRPV1-mediated mechanisms.|
|Keywords:||Colon; Neurons, Afferent; Splanchnic Nerves; Animals; Rats; Rats, Sprague-Dawley; Colitis; Inflammation; Dextran Sulfate; Sensory System Agents; Analysis of Variance; Physical Stimulation; Microelectrodes; Action Potentials; Dose-Response Relationship, Drug; Male; TRPV Cation Channels; In Vitro Techniques|
|Description:||Copyright © 2009 Elsevier Ireland Ltd All rights reserved.|
|Appears in Collections:||Molecular and Biomedical Science publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.