Abstract：
:Direct exposure of rats to tobacco smoke induces antinociception. We presently investigated if this antinociception is mediated via nicotinic and/or mu-opioid receptors. Adult male rats were surgically implanted with Alzet osmotic minipumps that delivered either saline (control), the nicotinic antagonist mecamylamine, or the opiate antagonist naltrexone (3 mg/kg/day i.v. for 21 days). Nocifensive responses were assessed on alternate days using tail-flick reflex latency (TFL) over a 3-week period. During the second week, the rats were exposed to concentrated cigarette smoke in an environmental chamber for 6 h/day for 5 consecutive days; a control group was similarly exposed to filtered cigarette smoke. Rats receiving mecamylamine and naltrexone exhibited a significant weight loss after the first day of infusion. All treatment groups additionally exhibited significant weight loss during exposure to unfiltered or filtered smoke. The saline group exhibited significant antinociception on the first day of smoke exposure with rapid development of tolerance. The mecamylamine and naltrexone groups did not exhibit significant antinociception. Controls exposed to filtered smoke (with approximately 50% lower nicotine concentration) also exhibited significant analgesia on the first exposure day with rapid development of tolerance. Exposure to high levels of cigarette smoke, or to filtered smoke with a lower nicotine concentration in the vapor phase, induces antinociception with rapid development of tolerance. The antinociceptive effect appears to be mediated via nicotinic and mu-opioid receptors.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Simons CT,Cuellar JM,Moore JA,Pinkerton KE,Uyeminami D,Carstens MI,Carstens Edoi
10.1016/j.neulet.2005.07.025keywords:
subject
Has Abstractpub_date
2005-12-02 00:00:00pages
71-6issue
2eissn
0304-3940issn
1872-7972pii
S0304-3940(05)00830-Xjournal_volume
389pub_type
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