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KMID : 1129720090260020091
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Korean Journal of Acupuncture
2009 Volume.26 No. 2 p.91 ~ p.108
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Effects of Electroacupuncture on the Visceromotor Response to Colonic Distension in TNBS-Induced Colonic Inflammation in Rats
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Choi Yun-Young
Ahn Seong-Hun
Kwon Oh-Sang
Sohn In-Chul
Kim Jae-Hyo
Seo Sang-Rok
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Abstract
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Objectives: Single colorectal instillation of trinitrobenzenesulphonic acid (TNBS) causes a dose-dependent increase of visceral motor response (VMR) and severity of inflammation. In this study we compared the effects of electroacupuncture in the different acupoints in the acute colitis induced by TNBS intracolonic injection in rats.
Methods: In Male Sprague-Dawley rats, weighing 250~400g, a single colorectal administration of TNBS 5mg/kg and 50% ethanol under isoflurane anaesthesia after an overnight fast. Electrodes for electromyography (EMG) recording were stitched into the external oblique musculature under general anesthesia. Acupoints of LI4, ST25, or ST36 were stimulated by electroacupuncture, respectively. The balloon was inserted intra-anally and visceral motor response (VMR) to colorectal distensioin (CRD) was quantified with an EMG recording system.
Results: At an observation of the visceral hyperalgesia in the day-time series, the visceromotor response increased significantly 3 days after TNBS intra-rectalcolonic injection in rats. Electroacupuncture on either ST25 or ST36 suppressed the visceromotor response to colorectal distension, but not LI4, at 3 days after TNBS injection. Pretreatment of naltrexone (10 mg/kg, i.p.), opioids antagonist, inhibited the VMR suppress of 10Hz EA to ST36 but not phentolamine (5 mg/kg, i.p.). Pretreatment of either naltrexone or phentolamine inhibited effects of 10Hz EA to ST25.
Conclusions: Data show that EA at either ST25 or ST36 potently inhibits hypersensitivity of colorectum after TNBS induced colitis and is differently mediated through the endogenous opioid system and adrenergic system.
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KEYWORD
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trinitrobenzenesulphonic acid, colitis, visceral motor response, electroacupuncture
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