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  • Title: Analgesic effects of electroacupuncture at ST25 and CV12 in a rat model of postinflammatory irritable bowel syndrome visceral pain.
    Author: Zhu X, Liu Z, Qin Y, Niu W, Wang Q, Li L, Zhou J.
    Journal: Acupunct Med; 2018 Aug; 36(4):240-246. PubMed ID: 29720377.
    Abstract:
    BACKGROUND: Treatment with electroacupuncture (EA) at ST25 and CV12 has a significant analgesic effect on postinflammatory irritable bowel syndrome (PI-IBS) visceral pain. Enterochromaffin (EC) cells and serotonin (5-hydroxytryptamine (5-HT)) are important in the development of visceral hyperalgesia. OBJECTIVE: To investigate the analgesic effect and underlying mechanisms of EA at ST25 and CV12 on the treatment of trinitrobenzene sulfonic acid (TNBS)-induced PI-IBS visceral hyperalgesia in rats. METHODS: After EA at ST25 and CV12, changes in abdominal withdrawal reflex (AWR), electromyography (EMG) recordings, colonic EC cell numbers, and expression of tryptophan hydroxylase (TPH), 5-HT and 5-hydroxyindoleacetic acid (5-HIAA) of TNBS-induced PI-IBS visceral hyperalgesia in rats were examined. RESULTS: The results of AWR tests and EMG recordings indicated a significant analgesic effect of EA stimulation at ST25 and CV12on PI-IBS visceral hyperalgesia (p<0.05). In addition, the increased EC cell numbers and colonic expression of TPH and 5-HT in rats with TNBS-induced PI-IBS visceral hyperalgesia were significantly reduced by EA (p<0.05). CONCLUSIONS: EA stimulation at ST25 and CV12 can attenuate visceral hyperalgesia. This analgesic effect may be mediated via reduction of both colonic EC cell number and 5-HT concentration.
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