DAMGO, a μ-Opioid Agonist and Cholecystokinin-Octapeptide Have Dual Modulatory Effects on Capsaicin-Activated Current in Rat Dorsal Root Ganglion Neurons
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- 영문명
- DAMGO, a μ-Opioid Agonist and Cholecystokinin-Octapeptide Have Dual Modulatory Effects on Capsaicin-Activated Current in Rat Dorsal Root Ganglion Neurons
- 발행기관
- 대한생리학회-대한약리학회
- 저자명
- Su-Yong Eun Jimok Kim Jihye Lee Sung Jun Jung Joo Min Park Yun Kyung Park Dongkwan Kim Sang Jeong Ki
- 간행물 정보
- 『The Korean Journal of Physiology & Pharmacology』제5권 제1호, 71~78쪽, 전체 8쪽
- 주제분류
- 의약학 > 의학일반
- 파일형태
- 발행일자
- 2001.01.01
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국문 초록
영문 초록
Capsaicin, a pungent ingredient of hot pepper, elicits an intense burning pain when applied cutaneously and intradermally. Activation of capsaicin-gated channel in C-type dorsal root ganglion (DRG) neurons produces nonselective cationic currents. Although electrophysiological and biochemical properties of capsaicin-activated current (ICAP) were studied, the regulatory mechanism and intracellular signaling pathway are still unclear. In the present study, we investigated the modulations of ICAP by DAMGO (μ-opioid agonist) and cholecystokinin octapeptide (CCK-8). In 18 out of 86 cells, the amplitude of ICAP was significantly increased by DAMGO and completely reversed after washout, while ICAP was decreased by DAMGO in 25 cells. In 43 cells, DAMGO had no effect on ICAP. Mean action potential duration was significantly different between increased-by-DAMGO group and decreased-by-DAMGO group. Mean amplitudes of IH were not significantly different between both groups. CCK-8 reversibly enhanced the amplitude of ICAP (5/13). DAMGO also increased ICAP amplitude significantly in the same cells. The amplitude of ICAP was increased in additive manner by combined applications of DAMGO and CCK-8 in these cells. These results suggest that DAMGO and CCK-8 can either increase or decrease ICAP presumably depending on the subtypes of DRG cells and classified by electrophysiological properties.
목차
키워드
해당간행물 수록 논문
- DAMGO, a μ-Opioid Agonist and Cholecystokinin-Octapeptide Have Dual Modulatory Effects on Capsaicin-Activated Current in Rat Dorsal Root Ganglion Neurons
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