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Cited by 429

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Orexin (Hypocretin) Neurons Contain Dynorphin

Open access
Chou, Thomas C., Lee, Charlotte E., Lu, J., Elmquist, Joel K., Hara, Junko, Willie, Jon T., Beuckmann, Carsten T., Chemelli, Richard M., Sakurai, Takeshi, Yanagisawa, Masashi, Saper, Clifford B., Scammell, Thomas E.·2001·The Journal of Neuroscience

Abstract

Orexins (also called hypocretins) are peptide neurotransmitters expressed in neurons of the lateral hypothalamic area (LHA). Mice lacking the orexin peptides develop narcolepsy-like symptoms, whereas mice with a selective loss of the orexin neurons develop hypophagia and severe obesity in addition to the narcolepsy phenotype. These different phenotypes suggest that orexin neurons may contain neurotransmitters besides orexin that regulate feeding and energy balance. Dynorphin neurons are common in the LHA, and dynorphin has been shown to influence feeding; hence, we studied whether dynorphin and orexin are colocalized. In rats, double-label in situ hybridization revealed that nearly all (94%) neurons expressing prepro-orexin mRNA also expressed prodynorphin mRNA. The converse was also true: 96% of neurons in the LHA containing prodynorphin mRNA also expressed prepro-orexin mRNA. Double-label immunohistochemistry confirmed that orexin-A and dynorphin-A peptides were highly colocalized in the LHA. Wild-type mice and orexin knock-out mice showed abundant prodynorphin mRNA-expressing neurons in the LHA, but orexin/ataxin-3 mice with a selective loss of the orexin neurons completely lacked prodynorphin mRNA in this area, further confirming that within the LHA, dynorphin expression is restricted to the orexin neurons. These findings suggest that dynorphin-A may play an important role in the function of the orexin neurons.

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Crossref · 10.1523/jneurosci.21-19-j0003.2001

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Metadata

Authors
Chou, T. C., Lee, C. E., Lu, J., Elmquist, J. K., Hara, J., Willie, J. T., Beuckmann, C. T., Chemelli, R. M., Sakurai, T., Yanagisawa, M., Saper, C. B., & Scammell, T. E.
Venue
The Journal of Neuroscience
Published
2001-10-01
Volume
21
Issue
19
Pages
RC168-RC168
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2115861749
Cited by
429
References
7
FWCI
8.19
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Orexin (Hypocretin) Neurons Contain Dynorphin. https://app.cochat.ai/papers/10.1523/jneurosci.21-19-j0003.2001
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Chou, T. C., Lee, C. E., Lu, J., Elmquist, J. K., Hara, J., Willie, J. T., Beuckmann, C. T., Chemelli, R. M., Sakurai, T., Yanagisawa, M., Saper, C. B., & Scammell, T. E. (2001). Orexin (Hypocretin) Neurons Contain Dynorphin. The Journal of Neuroscience. https://doi.org/10.1523/jneurosci.21-19-j0003.2001

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