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KMID : 0608520110170030105
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Korean Journal of Oriental Medicine
2011 Volume.17 No. 3 p.105 ~ p.114
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Frequency Dependent Electroacupuncture Modulates the Visceromotor Responses to Colonic Distension in TNBS-Induced Colonic Inflammatory Rats
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Choi Yun-Young
Yang Seung-Bum
Ahn Seong-Hun
Sohn In-Chul
Kim Jae-Hyo
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Abstract
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Objectives: The transient inflammation has been demonstrated to alter visceral motor response (VMR) and acute mucosal inflammation may precede the manifestation of visceral hyperalgesia in animal models. The purpose of our study is to compare effects of the different frequencies applied electroacupuncture (EA) on acupoints in acute colitis induced by trinitrobenzenesulphonic acid (TNBS).
Methods: In Male Sprague-Dawley rats, weighing 250~400g, a single colorectal administration of TNBS (5mg/kg) was made and electrode for electromyography (EMG) recording were stitched into the external oblique musculature. EA of either ST25 or ST36 were applied and stimulation parameter was modulated as follows: 2, 10, or 100 Hz with intensity of 2 mA and 1 ms pulse duration for 30 min. The balloon was inserted intra-anally and VMR to colorectal distension (CRD) was quantified with an EMG recording system.
Results: The VMR increased significantly 3 days after TNBS intra-rectalcolonic injection in rats. Both 2 Hz and 10 Hz EA on ST36 suppressed VMR to CRD in the acute colitis model but not 100 Hz. Only 10 Hz EA on ST25 suppressed VMR to CRD in the acute colitis.
Conclusions: These data show that 10 Hz EA potently inhibits hypersensitivity of colorectum after TNBS induced colitis.
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KEYWORD
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trinitrobenzenesulphonic acid (TNBS), colitis, visceral motor response, electroacupuncture, frequency
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