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Updated: Jun 20, 2026

Identification of Orexin and Endocannabinoid Receptors in Adult Zebrafish Using Immunoperoxidase and Immunofluorescence Methods
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Identification of Orexin and Endocannabinoid Receptors in Adult Zebrafish Using Immunoperoxidase and Immunofluorescence Methods

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Integrative physiology of orexins and orexin receptors

Michihiro Mieda1, Takeshi Sakurai

  • 1Department of Molecular Neuroscience and Integrative Physiology, Graduate School of Medical Science, Kanazawa University, Kanazawa, Ishikawa, Japan.

CNS & Neurological Disorders Drug Targets
|August 20, 2009
PubMed

Insights

The orexin system is crucial for regulating sleep and wakefulness. Its deficiency causes narcolepsy, opening doors for new sleep disorder treatments.

Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Endocrinology

Background:

  • The orexin system plays a vital role in maintaining sleep/wake states.
  • Orexin signaling deficiency is the cause of narcolepsy-cataplexy in multiple species.
  • This highlights the orexin system as a potential therapeutic target for sleep disorders.

Purpose of the Study:

  • To review and discuss the current understanding of the orexin system's integrative physiology.
  • To explore the orexin system's role in regulating sleep and wakefulness.
  • To examine the orexin system's interactions with emotion, reward, and energy homeostasis pathways.

Main Methods:

  • Literature review of recent studies on the orexin system.
  • Analysis of findings related to orexin deficiency and narcolepsy.
  • Discussion of the orexin system's physiological functions and interactions.

Main Results:

  • The orexin system is a critical regulator of sleep/wake states.
  • Orexin deficiency leads to narcolepsy-cataplexy.
  • The orexin system integrates with neuronal systems controlling emotion, reward, and energy balance.

Conclusions:

  • The orexin system is central to sleep-wake regulation and has implications for narcolepsy treatment.
  • Understanding the orexin system's integrative physiology is key to developing novel therapies for sleep disorders.
  • The orexin system's connections to emotion, reward, and energy homeostasis underscore its broad physiological importance.

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