대한한의학회지 (The Journal of Korean Medicine)

  • 제24권3호
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  • Pages.108-117
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  • 2003
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  • 1010-0695(pISSN)
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  • 2288-3339(eISSN)
대한한의학회 (The Society of Korean Medicine)
권호 표지

만성통증을 억제하는 전침효과의 말초성 기전과 아편양물질수용기에 관한 연구

Study on Peripheral Mechanism and Opioid Receptors Implicated in Electroacupunture-induced Inbibition of Chronic Pain

  • 신홍기 (한양대학교 의과대학 생리학교실) ;
  • 이서은 (한양대학교 의과대학 생리학교실) ;
  • 박동석 (경희대학교 한의과대학 침구학교실)
  • 발행 : 2003.09.01
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초록

Objective : The central opioid mechanism of acupuncture analgesia has been fairly well documented in acute behavioral experiments, but little electrophysiological study has been performed on the peripheral mechanism and subtypes of opioid receptors responsible for acupuncture-induced antinociception in chronic animal models. In the present electrophysiological experiment, we studied the peripheral mechanism and opioid receptor subtypes which Were implicated in electroacupuncture-induced antinociception in the rat with chronic inflammatory and neurogenic pain. Methods : In the rat with complete Freund's adjuvant-induced inflammation and spinal nerve injury, dorsal horn cell responses to afferent C fiber stimulation were recorded before and after electroacupuncture (EA) stimulation applied to the contralateral Zusanli point for 30 minutes. Also studied Were the effects of specific opioid receptor antagonists and naloxone methiodide, which can not cross the blood-brain barrier, on EA-induced inhibitory action. Results : EA-induced inhibitory action was significantly attenuated by naloxone methiodide, suggesting that EA-induced inhibition was mediated through peripheral mechanism. Pretreatment, but not posttreatment of naltrexone and spinal application significantly blocked EA-induced inhibitory actions. In inflammatory and neurogenic pain models, ${\mu}-$ and ${\delta}-opioid$ receptor antagonists (${\beta}-funaltrexamine$ & naltrindole) significantly reduced EA-induced inhibitory action, but ${\kappa}-opioid$ receptor antagonist had weak inhibitory effect on EA-induced antinociception. Conclusion : These results suggest that 2Hz EA-stimulation induced antinoeiceptive action is mediated through peripheral as well as central mechanism, and mainly through ${\mu}-$ and ${\delta}-opioid$ receptors.

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