Orexin Receptor 2 Agonists Succeed in Phase 3 Trials for Narcolepsy Type 1
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Narcolepsy type 1 is defined by cataplexy and a deficiency of orexin, a wakefulness-regulating neuropeptide, and is mostly autoimmune in origin, with more than 90% of patients carrying specific HLA variants. In type 2, orexin levels are normal and the mechanism is unknown. Diagnosis rests on sleep history plus a multiple sleep latency test showing mean sleep onset under 8 minutes with at least two REM onsets, and sometimes CSF orexin measurement. Orexin receptor 2 agonists, the first drug class to target the underlying neurochemical defect, significantly improved wakefulness and cataplexy in two phase 3 trials. The work underpinning the class was recognized when the 2026 Lasker Award went to orexin discoverers Mignot and Yanagisawa. Open questions include regulatory timelines and applicability to type 2 disease.
Written by a model from the reports · updated 2 hours ago
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- youtube.comOrexin Receptor 2 Agonists Succeed in Phase 3 for Narcolepsy Type 1
A JAMA Network review discussion covers narcolepsy type 1, defined by cataplexy and orexin deficiency, mostly autoimmune in origin, with more than 90% of patients carrying specific HLA variants, versus type 2, where orexin is normal and the mechanism is unknown. Diagnosis rests on sleep history plus a multiple sleep latency test showing mean sleep onset under 8 minutes with at least two REM onsets, and sometimes CSF orexin measurement. Orexin receptor 2 agonists, the first drug class targeting the underlying neurochemical defect, significantly improved wakefulness and cataplexy in two phase 3 trials, and the 2026 Lasker Award went to orexin discoverers Mignot and Yanagisawa.
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