کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4319638 | 1290825 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Acute delta- and kappa-opioid agonist pretreatment potentiates opioid antagonist-induced suppression of water consumption
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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
The primary objective of this study was to determine whether pretreatment with kappa- and delta-opioid agonists potentiates naltrexone-induced suppression of water consumption following 24Â h of deprivation. This study also examined the temporal effects of agonist-induced antinociception using the tail-flick and hot-plate tests. Adult male Sprague-Dawley rats were water deprived 20Â h and then given an injection (s.c. or i.c.) of an opioid agonist or saline. Drugs included the mu-opioid agonists morphine and DAMGO ([d-Ala2,NMePhe4,Gly-ol5]-enkephalin), the kappa-opioid agonists spiradoline, bremazocine, and U69,593, and the delta-opioid agonists BW 373U86 and DPDPE ([D-Pen2, D-Pen5]-enkephalin). Three hours and forty-five minutes later, animals received a single dose of naltrexone (0.1-30Â mg/kg, s.c.) or saline. Fifteen minutes later, animals were allowed free access to water for 30Â min. For the tail-flick and hot-plate tests, animals were given a single injection of agonist and tested in both procedures every 30Â min for up to 2Â h, then hourly up to 6Â h post-injection. Naltrexone dose-dependently suppressed fluid consumption 24Â h after deprivation. The effects of naltrexone on drinking were potentiated following pretreatment with at least one dose of the agonists tested except BW 373U86. With the exception of BW 373U86, DAMGO, and DPDPE, all of the opioid agonists produced significant antinociception in the hot-plate test. Only BW 373U86 failed to have an antinociceptive effect in the tail-flick test. By 4Â h after treatment, drug-induced antinociception had largely waned, suggesting the potentiation of naltrexone-induced drinking suppression was not a result of a direct interaction with the agonists. In conclusion, kappa-opioid and delta-opioid receptors appear to contribute to the manifestation of acute opioid dependence, albeit to a lesser degree than mu-opioid receptors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Research Bulletin - Volume 76, Issue 6, 15 August 2008, Pages 597-604
Journal: Brain Research Bulletin - Volume 76, Issue 6, 15 August 2008, Pages 597-604
نویسندگان
David A. White, Michael E. Ballard, Alvin C. Harmon, Stephen G. Holtzman,