Systemic inflammation as a moderator between sleep and incident dementia
Andrée-Ann Baril1,2, Alexa S Beiser1,2,3, Susan Redline4,5,6
1The Framingham Heart Study, Framingham, MA.
Sleep
|August 30, 2020
Summary
Systemic inflammation, measured by C-reactive protein (CRP), influences the link between nighttime wakefulness and dementia risk. High CRP amplifies dementia risk with more awakenings, while low CRP increases risk with fewer awakenings.
Area of Science:
- Neuroscience
- Gerontology
- Inflammation Research
Background:
- Systemic inflammation, indicated by C-reactive protein (CRP), is increasingly recognized as a factor in age-related cognitive decline.
- Sleep disturbances are also implicated in the development of dementia, including Alzheimer's disease (AD).
- The interplay between inflammation and sleep in dementia pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate whether C-reactive protein (CRP) modifies the relationship between sleep parameters and the incidence of dementia.
- To explore the moderating role of inflammation in the association between sleep disturbances and neurodegenerative outcomes.
Main Methods:
- Utilized data from the Framingham Heart Study, including serum CRP levels and polysomnography-derived sleep metrics (duration, efficiency, latency, WASO, awakenings).
- Classified participants into low, average, and high CRP groups for comparative analysis.
- Monitored participants for incident all-cause dementia and Alzheimer's disease (AD) dementia over a median follow-up of 13.4 years.
Main Results:
- No direct association was found between CRP levels or sleep exposures alone and dementia incidence.
- A significant interaction was observed between CRP levels and nighttime wakefulness (WASO, number of awakenings) in predicting dementia risk.
- In the high CRP group, increased WASO and awakenings were linked to higher dementia risk, whereas in the low CRP group, fewer awakenings were associated with increased risk.
Conclusions:
- Systemic inflammation, as indicated by CRP, significantly moderates the association between nighttime wakefulness and the risk of developing dementia.
- Inflammation status is a critical factor in understanding how sleep disturbances contribute to neurodegeneration and dementia.
- Targeting inflammation may be a potential strategy to mitigate dementia risk in individuals with sleep disturbances.
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