Enhanced antinociception by intracerebroventricularly and intrathecally-administered orexin A and B (hypocretin-1 and-2) in mice

被引:101
作者
Mobarakeh, JI
Takahashi, K
Sakurada, S
Nishino, S
Watanabe, H
Kato, M
Yanai, K
机构
[1] Tohoku Univ, Sch Med, Dept Pharmacol, Aoba Ku, Sendai, Miyagi 9808575, Japan
[2] Pasteur Inst Iran, Dept Pharmacol & Physiol, Tehran 13164, Iran
[3] Tohoku Univ, Sch Med, Dept Mol Biol & Appl Physiol, Aoba Ku, Sendai, Miyagi 9808575, Japan
[4] Tohoku Pharmaceut Univ, Dept Physiol & Anat, Aoba Ku, Sendai, Miyagi 9818558, Japan
[5] Stanford Sleep Res Ctr, Ctr Narcolepsy, Palo Alto, CA 94304 USA
基金
日本学术振兴会;
关键词
orexin; pain perception; nociception; C57BL/6; mouse; intracerebroventricular; intrathecal;
D O I
10.1016/j.peptides.2005.01.001
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Orexins are neuropeptides located exclusively in neurons of the lateral hypothalamic area, which send projections to most monoaminergic nuclei, such as noradrenergic locus coeruleus, dopaminergic ventral tegmental areas, and histaminergic tuberomammillary nuclei. The present work was carried out to examine the role of orexins in nociception in mice. C5713L/6 mice were administered with orexin A and B intracerebroventricularly (i.c.v.), intrathecally (i.t.) and subcutaneously (s.c.) to reveal the sites of action of these peptides and to examine the pain thresholds using four kinds of nociceptive tasks. Orexins showed antinociceptive effects in all four types of assays for thermal (hot-plate, tail-flick, paw-withdrawal), mechanical (tail-pressure), chemical (formalin, capsaicin and abdominal stretch) nociceptions and nociceptininduced behavioral responses, when administered i.c.v. or i.t., whereas the s.c. administration was ineffective. The antinociceptive effects of orexin A were more remarkable than those of orexin B. The i.c.v. administration of orexin A was as effective as, or more potent than the i.t. administration. The effects of orexin A were completely blocked by adenosine type I receptor antagonists, 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) and theophylline, but not by naloxone, suggesting a possible involvement of the adenosine-containing neurons and/or the adenosine pathway in these orexin actions. The i.c.v. administration of nociceptin had no significant effects on orexin expression in the brain and spinal cord. The present findings suggest that orexins have an antinociceptive role in at least four different types of pains, probably acting on both the brain and spinal cord. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:767 / 777
页数:11
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