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The roles of orexins in sleep/wake regulation

Michihiro Mieda1

  • 1Department of Molecular Neuroscience and Integrative Physiology, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-Machi, Kanazawa, Ishikawa 920-8640, Japan.

Neuroscience Research
|May 21, 2017
PubMed

Insights

Orexin neuropeptides are crucial for maintaining wakefulness. Disruptions in orexin signaling cause narcolepsy, a sleep disorder characterized by excessive daytime sleepiness and cataplexy.

Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Endocrinology

Background:

  • Orexin A and orexin B are hypothalamic neuropeptides acting as ligands for G-protein coupled receptors (GPCRs).
  • Orexin signaling deficiency is linked to narcolepsy-cataplexy in multiple species.
  • Orexins are implicated in regulating wakefulness through monoaminergic and cholinergic pathways.

Purpose of the Study:

  • To review recent advances in understanding orexin's role in sleep-wake regulation.
  • To explore how orexin signaling prevents narcolepsy.

Main Methods:

  • Review of molecular genetic studies.
  • Analysis of electrophysiological data.
  • Pharmacological and neuroanatomical study evaluation.

Main Results:

  • Orexins play a critical role in maintaining wakefulness.
  • Dysfunctional orexin signaling leads to narcolepsy.
  • Orexins regulate wakefulness by influencing monoaminergic and cholinergic neurons.

Conclusions:

  • Orexin signaling is essential for normal sleep-wake cycles.
  • Further research into orexin pathways can inform narcolepsy treatments.
Keywords:
Efferent pathwayGPCRMonoamineNarcolepsyOrexinSleep/wakefulness

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