Abstract
In this study, we investigated the role of orexinergic systems in dopamine-related behaviors induced by the μ-opioid receptor agonist morphine in rodents. Extensive coexpression of tyrosine hydroxylase with orexin receptors was observed in the mouse ventral tegmental area (VTA). The levels of dopamine and its major metabolites in the nucleus accumbens were markedly increased by the microinjection of orexin A and orexin B into the VTA. The subcutaneous morphine-induced place preference and hyperlocomotion observed in wild-type mice were abolished in mice that lacked the prepro-orexin gene. An intra-VTA injection of a selective orexin receptor antagonist SB334867A [1-(2-methylbenzoxazol-6-yl)-3-[1.5]naphthyridin-4-yl urea] significantly suppressed the morphine-induced place preference in rats. Furthermore, the increased level of dialysate dopamine produced by morphine in the mouse brain was significantly decreased by deletion of the prepro-orexin gene. These findings provide new evidence that orexin-containing neurons in the VTA are directly implicated in the rewarding effect and hyperlocomotion induced by morphine through activation of the mesolimbic dopamine pathway in rodents.
Bibliography
Narita, M., Nagumo, Y., Hashimoto, S., Narita, M., Khotib, J., Miyatake, M., Sakurai, T., Yanagisawa, M., Nakamachi, T., Shioda, S., & Suzuki, T. (2006). Direct Involvement of Orexinergic Systems in the Activation of the Mesolimbic Dopamine Pathway and Related Behaviors Induced by Morphine. The Journal of Neuroscience, 26(2), 398â405.
Authors
11
- Minoru Narita (first)
- Yasuyuki Nagumo (additional)
- Seiko Hashimoto (additional)
- Michiko Narita (additional)
- Junaidi Khotib (additional)
- Mayumi Miyatake (additional)
- Takeshi Sakurai (additional)
- Masashi Yanagisawa (additional)
- Tomoya Nakamachi (additional)
- Seiji Shioda (additional)
- Tsutomu Suzuki (additional)
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40
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Dates
Type | When |
---|---|
Created | 19 years, 7 months ago (Jan. 11, 2006, 5:20 p.m.) |
Deposited | 2 years, 4 months ago (April 13, 2023, 1:09 p.m.) |
Indexed | 58 minutes ago (Sept. 4, 2025, 2:49 a.m.) |
Issued | 19 years, 7 months ago (Jan. 11, 2006) |
Published | 19 years, 7 months ago (Jan. 11, 2006) |
Published Online | 19 years, 7 months ago (Jan. 11, 2006) |
Published Print | 19 years, 7 months ago (Jan. 11, 2006) |
@article{Narita_2006, title={Direct Involvement of Orexinergic Systems in the Activation of the Mesolimbic Dopamine Pathway and Related Behaviors Induced by Morphine}, volume={26}, ISSN={1529-2401}, url={http://dx.doi.org/10.1523/jneurosci.2761-05.2006}, DOI={10.1523/jneurosci.2761-05.2006}, number={2}, journal={The Journal of Neuroscience}, publisher={Society for Neuroscience}, author={Narita, Minoru and Nagumo, Yasuyuki and Hashimoto, Seiko and Narita, Michiko and Khotib, Junaidi and Miyatake, Mayumi and Sakurai, Takeshi and Yanagisawa, Masashi and Nakamachi, Tomoya and Shioda, Seiji and Suzuki, Tsutomu}, year={2006}, month=jan, pages={398–405} }