Orexin A
Overview
Orexin A is a 33-amino acid neuropeptide produced in the lateral hypothalamus that plays a critical role in the regulation of wakefulness, arousal, and energy homeostasis. It binds with high affinity to both orexin receptor 1 (OX1R) and orexin receptor 2 (OX2R), promoting cortical activation and stabilizing the wake state.
Mechanism of Action
Deficiency of orexin signaling is the hallmark of narcolepsy type 1, making orexin replacement a rational therapeutic strategy.
Research Summary & Key Findings
Preclinical studies in narcoleptic animal models have demonstrated that central administration of orexin A restores wakefulness and reduces cataplexy, with findings published in leading neuroscience journals in the early 2000s. Therapeutic development has been hindered by poor blood-brain barrier penetration and peptide instability, prompting focus on orexin receptor agonists rather than peptide replacement. No orexin A formulation has advanced to clinical trials in humans.
Clinical Status
Orexin A is in the research phase with limited clinical data in humans. Current evidence is primarily derived from preclinical (animal or in vitro) studies.
Administration Routes
References
Primary literature
- PubMed — "Orexin A"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov — "Orexin A"
Registered interventional and observational studies, including status and phase.
- PubChem — "Orexin A"
Chemical structure, molecular properties, and bioactivity data.
Study-level citations for this compound are being verified against the primary sources before publication. The database queries above return the current indexed literature in the meantime.
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