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Exploring the cytokine and endocrine involvement in narcolepsy
1Department of Psychology, University of Colorado at Denver, CB 173, POB 173364, Denver, CO 80217-3364, USA.
Brain, Behavior, and Immunity
|May 26, 2004
Summary
Narcolepsy patients show higher levels of inflammatory cytokines (TNF-alpha, IL-6) and human growth hormone (hGH). These immune and endocrine system changes correlate with sleep disturbances in narcolepsy.
Area of Science:
- Neurology
- Immunology
- Endocrinology
Background:
- Narcolepsy is a neurological sleep disorder causing excessive daytime sleepiness.
- Pro-inflammatory cytokines are increasingly implicated in narcolepsy pathogenesis.
- The role of human growth hormone (hGH) in narcolepsy requires further investigation.
Purpose of the Study:
- To investigate the association between narcolepsy and plasma levels of specific cytokines and hGH.
- To explore the correlation between immune markers, endocrine factors, and narcolepsy symptoms.
Main Methods:
- Serum and clinical data were collected from 39 narcoleptic subjects and 40 controls.
- Plasma levels of Tumor Necrosis Factor-alpha (TNF-alpha), Interleukin-6 (IL-6), and human growth hormone (hGH) were quantified using ELISA.
- The Epworth Sleepiness Scale (ESS) was used to assess daytime sleepiness.
Main Results:
- Narcoleptic subjects exhibited significantly elevated levels of TNF-alpha and IL-6 compared to controls (p=.001).
- Plasma hGH levels were also significantly higher in narcoleptic individuals (p <.0001).
- Narcoleptics reported significantly higher Epworth Sleepiness Scale scores (17.7+/-4.6) versus controls (5.5+/-3.2, p <.0001).
Conclusions:
- Narcolepsy is associated with increased serum levels of TNF-alpha, IL-6, and hGH.
- Sleep dysregulation in narcolepsy correlates with immune and endocrine system dysregulation.
- Observed immune and endocrine changes may contribute to disturbed sleep and increased infection susceptibility in narcolepsy.
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