JaLCDOI 10.18926/AMO/53338
フルテキストURL 69_2_95.pdf
著者 Lee, Mi Geum| Lee, Dong Kyu| Huh, Billy K.| Choi, Sang Sik| Kim, Hee Zoo| Lim, Byung Gun| Kim, Hong Soon| Choi, Yun Suk| Hur, Won Seok| Lee, Mi Kyoung|
抄録 Resiniferatoxin (RTX) is an ultrapotent synthetic TRPV1 (transient receptor potential vanilloid subtype 1) agonist with significant initial transient hyperalgesia followed by a prolonged analgesic effect in response to thermal stimulus. Using a rat model of neuropathic pain, we evaluated the effect of pretreatment with clonidine-which has been shown to relieve intradermal capsaicin-induced hyperalgesia-on the initial hyperalgesic response and the thermal analgesic property of RTX. Thirty-six male rats were divided into 6 treatment groups (n=6 each):RTX 500ng, RTX 1μg, clonidine 20μg (Cl), Cl+RTX 500ng, Cl+RTX 1μg, or normal saline 20μL (control). We evaluated the short-term (180min) and long-term (20 days) analgesic effects of RTX after thermal stimulation and mechanical stimulation. RTX had significant initial transient hyperalgesia followed by a prolonged analgesic effect in response to the thermal stimulus, but the RTX 500ng and RTX 1μg groups showed no initial short-term thermal hyperalgesic responses when pretreated with clonidine. The Cl+RTX 1μg ratsʼ behavior scores indicated that they were more calm and comfortable compared to the RTX 1μg rats. Even though we cannot precisely confirm that pretreatment with clonidine potentiates or adds to the analgesic effect of RTX, clonidine pretreatment with epidural RTX eliminated the initial RTX-associated hyperalgesic response and systemic toxicity in this neuropathic pain rat model.
キーワード clonidine epidural administration resiniferatoxin spinal nerve ligation rat model thermal hyperalgesia
Amo Type Original Article
発行日 2015-04
出版物タイトル Acta Medica Okayama
出版者 Okayama University Medical School
開始ページ 95
終了ページ 103
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
著作権者 CopyrightⒸ 2015 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 25899631
Web of Sience KeyUT 000353181700004