Narcolepsy: immunity, neural circuitry, and brain network reconfiguration.

Area of Science:

• Neuroscience
• Immunology
• Sleep Medicine

Background:

• Narcolepsy is a rare sleep disorder marked by excessive daytime sleepiness and cataplexy.
• The primary neuropathological finding is the loss of hypothalamic hypocretin (HCRT) neurons.
• Pathogenesis involves neuroimmune dysregulation, HCRT neuron loss, and neural circuit remodeling.

Purpose of the Study:

• To systematically review the roles of neuroimmune dysregulation, HCRT neuron loss, and neural circuit remodeling in narcolepsy.
• To provide a theoretical framework integrating immunity, neural circuitry, and brain network reconfiguration in narcolepsy pathophysiology.
• To identify potential diagnostic biomarkers and therapeutic targets for narcolepsy, especially type 1.

Main Methods:

• Searched PubMed, Web of Science, and Scopus (1990-April 2026).
• Included English, peer-reviewed articles providing mechanistic insights.
• Organized review around a framework linking immune dysregulation, HCRT neuron loss, sleep-wake circuits, and brain networks.

Main Results:

• Genetic and environmental factors trigger immune attacks, causing irreversible HCRT neuron loss.
• This loss disrupts sleep-wake homeostasis and REM-off/REM-on neuron balance.
• Brain network remodeling and instability result in narcolepsy symptoms like excessive daytime sleepiness and cataplexy.

Conclusions:

• A theoretical framework integrating immunity, neural circuitry, and brain networks explains narcolepsy pathophysiology.
• Understanding these mechanisms is crucial for developing diagnostic biomarkers and therapies.
• This framework is particularly relevant for type 1 narcolepsy.