Journal
JOURNAL OF ALZHEIMERS DISEASE
Volume 75, Issue 2, Pages 471-482Publisher
IOS PRESS
DOI: 10.3233/JAD-191122
Keywords
Amyloid-beta; cortisol; sleep deprivation
Categories
Funding
- National Institutes of Health [UL1 TR000448, KL2 TR000450, R03 AG047999, K76 AG054863, P50 AG005681, P01 AG026276, R01 NS065667, R01 DK093920]
- McDonnell Center for Systems Neuroscience at Washington University School of Medicine
- MetLife Foundation Award for Medical Research
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Background: Concentrations of soluble amyloid-beta (A beta) oscillate with the sleep-wake cycle in the interstitial fluid of mice and cerebrospinal fluid (CSF) of humans. Further, the concentration of A beta in CSF increases during sleep deprivation. Stress and disruption of the circadian clock are additional mechanisms hypothesized to increase CSF A beta levels. Cortisol is a marker for stress and has an endogenous circadian rhythm. Other factors such as glucose and lactate have been associated with changes in sleep-wake activity and/or A beta. Objective: In this exploratory study, we used samples collected in a previous study to examine how sleep deprivation affects A beta, cortisol, lactate, and glucose in plasma and CSF from healthy middle-aged adults (N = 11). Methods: Eleven cognitively normal participants without evidence of sleep disturbance were randomized to sleep deprivation or normal sleep control. All participants were invited to repeat the study. Cortisol, lactate, glucose, and A beta were measured in 2-h intervals over a 36-h period in both plasma and CSF. All concentrations were normalized to the mean prior to calculating mesor, amplitude, acrophase, and other parameters. Results: One night of sleep deprivation increases the overnight concentration of A beta in CSF approximately 10%, but does not significantly affect cortisol, lactate, or glucose concentrations in plasma or CSF between the sleep-deprived and control conditions. Conclusion: These data suggest that sleep deprivation-related changes in CSF A beta are not mediated by stress or circadian disruption as measured by cortisol.
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