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Orexin-A acts on the paraventricular nucleus of the midline thalamus to inhibit locomotor activity in rats
Li, Yonghui1,2; Li, Sa1; Sui, Nan2; Kirouac, Gilbert J.1; G. J. Kirouac
2009-10-01
Source PublicationPHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR
ISSN0091-3057
SubtypeArticle
Volume93Issue:4Pages:506-514
AbstractOrexins (hypocretins) are novel peptides that have been shown to play a role in control of behavioral arousal. The paraventricular nucleus of the midline thalamus (PVT) is one area of the brain that is the most densely innervated by orexin fibers. In addition, the PVT sends a dense projection to the nucleus accumbens an area, of the striatum involved in the regulation of locomotion. This study was done to determine the effect of microinjections of orexin-A (OXA) or the orexin receptor antagonist SB334867 in the PVT oil locomotor activity (LA) in morphine-naive and morphine-sensitized rats. Microinjections of OXA (3 mu g/500 nl) in or near the PVT inhibited LA in rats tested in a novel and familiar environment as well as in rats expressing behavioral sensitization to repeated injections of morphine. In contrast, microinjections of SB334867 had no effect on LA in any of the test situations. Using an approach involving experimenter based analysis of ethological behaviors; we found that microinjections of OXA in the midline thalamus decreased LA while at the same time increasing the expression of grooming and freezing. These results suggest that OXA can act on the PVT and the midline thalamus to produce arousal independent of LA.; Orexins (hypocretins) are novel peptides that have been shown to play a role in control of behavioral arousal. The paraventricular nucleus of the midline thalamus (PVT) is one area of the brain that is the most densely innervated by orexin fibers. In addition, the PVT sends a dense projection to the nucleus accumbens an area, of the striatum involved in the regulation of locomotion. This study was done to determine the effect of microinjections of orexin-A (OXA) or the orexin receptor antagonist SB334867 in the PVT oil locomotor activity (LA) in morphine-naive and morphine-sensitized rats. Microinjections of OXA (3 mu g/500 nl) in or near the PVT inhibited LA in rats tested in a novel and familiar environment as well as in rats expressing behavioral sensitization to repeated injections of morphine. In contrast, microinjections of SB334867 had no effect on LA in any of the test situations. Using an approach involving experimenter based analysis of ethological behaviors; we found that microinjections of OXA in the midline thalamus decreased LA while at the same time increasing the expression of grooming and freezing. These results suggest that OXA can act on the PVT and the midline thalamus to produce arousal independent of LA. (C) 2009 Elsevier Inc. All rights reserved.
KeywordOrexin Hypocretin Midline thalamic nuclei Paraventricular nucleus of thalamus Locomotion Morphine Arousal Drug addiction Sensitization
Subject Area医学心理学
Indexed BySCI
Language英语
WOS IDWOS:000269586800021
Citation statistics
Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.psych.ac.cn/handle/311026/5607
Collection中国科学院心理研究所回溯数据库(1956-2010)
Corresponding AuthorG. J. Kirouac
Affiliation1.Univ Manitoba, Fac Dent, Dept Oral Biol, Winnipeg, MB R3E 0W2, Canada
2.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing 100101, Peoples R China
First Author AffilicationKey Laboratory of Mental Health, CAS
Recommended Citation
GB/T 7714
Li, Yonghui,Li, Sa,Sui, Nan,et al. Orexin-A acts on the paraventricular nucleus of the midline thalamus to inhibit locomotor activity in rats[J]. PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR,2009,93(4):506-514.
APA Li, Yonghui,Li, Sa,Sui, Nan,Kirouac, Gilbert J.,&G. J. Kirouac.(2009).Orexin-A acts on the paraventricular nucleus of the midline thalamus to inhibit locomotor activity in rats.PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR,93(4),506-514.
MLA Li, Yonghui,et al."Orexin-A acts on the paraventricular nucleus of the midline thalamus to inhibit locomotor activity in rats".PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR 93.4(2009):506-514.
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