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Electroacupuncture Relieves Visceral Hypersensitivity by Inactivating Protease-Activated Receptor 2 in a Rat Model of Postinfectious Irritable Bowel Syndrome.


ABSTRACT: Background:The role of protease-activated receptor 2 (PAR2) in the analgesic effect of electroacupuncture (EA) on visceral hypersensitivity (VH) in postinfectious irritable bowel syndrome (PI-IBS) has yet to be elucidated. Aim:In this study, we investigated the molecular mechanisms underlying the analgesic effect of EA in a rat model of PI-IBS. Methods:Visceral hypersensitivity was evaluated by the abdominal withdrawal reflex test before and after administration of the PAR2 agonist, PAR2-AP, and/or EA. The protein expression and mRNA levels of PAR2, CGRP, SP, and TPSP in colon tissues were measured by immunofluorescence, western blot, and RT-PCR. Results:We found that EA could alleviate VH and significantly decrease protein and mRNA levels of PAR2, TPSP, CGRP, and SP in PI-IBS rats. The analgesic effect of EA on VH was slightly reduced in the presence of PAR2-AP. Conclusions:These results suggest that EA alleviates VH symptoms through downregulation of the levels of the TPSP/PAR2/SP/CGRP signaling axis in colon tissues in PI-IBS rats. Together, our data suggests that PAR2 plays a critical role in the analgesic effect of EA on VH in PI-IBS.

SUBMITTER: Xu W 

PROVIDER: S-EPMC6211213 | biostudies-other | 2018

REPOSITORIES: biostudies-other

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Electroacupuncture Relieves Visceral Hypersensitivity by Inactivating Protease-Activated Receptor 2 in a Rat Model of Postinfectious Irritable Bowel Syndrome.

Xu Wanli W   Yuan Mengqian M   Wu Xiaoliang X   Geng Hao H   Chen Lu L   Zhou Junling J   Song Yafang Y   Pei Lixia L   Sun Jianhua J  

Evidence-based complementary and alternative medicine : eCAM 20181018


<h4>Background</h4>The role of protease-activated receptor 2 (PAR2) in the analgesic effect of electroacupuncture (EA) on visceral hypersensitivity (VH) in postinfectious irritable bowel syndrome (PI-IBS) has yet to be elucidated.<h4>Aim</h4>In this study, we investigated the molecular mechanisms underlying the analgesic effect of EA in a rat model of PI-IBS.<h4>Methods</h4>Visceral hypersensitivity was evaluated by the abdominal withdrawal reflex test before and after administration of the PAR2  ...[more]

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