کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9721097 | 1473271 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of central and peripheral mGluR5 receptors in post-operative pain in rats
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب سلولی و مولکولی
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چکیده انگلیسی
Metabotropic glutamate receptors (mGluRs) have previously been shown to play a role in pain transmission during inflammatory or neuropathic pain states. However, the role of mGluR5 in post-operative pain remains to be fully investigated. The present study was conducted to characterize analgesic activity of 2-methyl-6-(phenylethynyl)-pyridine (MPEP) in the skin-incision-induced post-operative pain model in rats. MPEP is a potent and selective mGluR5 antagonist with high affinity (Ki=6.3±0.9 nM) in rat cortex using [3H]-MPEP as a radioligand, while not competing with the mGluR1-selective radioligand [3H]-R214127 (Ki>10,000 nM) in rat cerebellum. Post-operative pain was examined 2 h following surgery using weight-bearing (WB) difference between injured and uninjured paws as a measure of non-evoked pain. In this model, MPEP, as morphine, showed dose-dependent effects and full efficacy after systemic administration (ED50=15 mg/kg, i.p. for MPEP, ED50=1.3 mg/kg, s.c. for morphine). In addition, intrathecal (i.t.) and intracerebroventricular (i.c.v.) MPEP reduced WB difference (ED50=65 μg/rat i.t. and ED50=200 μg/rat i.c.v.). Interestingly, intraplantar (i.pl.) injection of MPEP either before or after surgery induced a similar reduction in WB difference (ED50=90 μg/rat, i.pl.) while contralateral i.pl. MPEP injection did not produce any effect. These results demonstrate that both peripheral and central mGluR5 receptors play a role in nociceptive transmission observed during post-operative pain. In addition, the data suggest that mGluR5 antagonists could offer a new therapeutic approach to the treatment of post-operative pain.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pain - Volume 114, Issues 1â2, March 2005, Pages 195-202
Journal: Pain - Volume 114, Issues 1â2, March 2005, Pages 195-202
نویسندگان
Chang Z. Zhu, Gin Hsieh, Odile EI-Kouhen, Sonya G. Wilson, Joe P. Mikusa, Peter R. Hollingsworth, Renjie Chang, Robert B. Moreland, Jorge Brioni, Michael W. Decker, Prisca Honore,