Chronic Systemic Inflammation Is Associated With Symptoms of Late-Life Depression: The ARIC Study
Natalia Sonsin-Diaz1, Rebecca F Gottesman2, Elizabeth Fracica3
1Johns Hopkins University (NSD), Baltimore, MD.
Summary
Chronic inflammation decades before old age is linked to increased depression symptoms in older adults. This association persists even with normal cognition, highlighting inflammation
Area of Science:
- Gerontology
- Neuroscience
- Immunology
Background:
- Systemic inflammation is increasingly recognized as a factor in age-related health conditions.
- The longitudinal relationship between midlife inflammation patterns and late-life depression remains underexplored.
- Understanding this link is crucial for developing preventative strategies for geriatric mental health.
Purpose of the Study:
- To investigate the association between longitudinal patterns of systemic inflammation and depression symptoms in older adults.
- To determine if chronic or intermittent inflammation over decades predicts late-life depression.
- To examine this relationship in the context of cognitive function.
Main Methods:
- Utilized data from the Atherosclerosis Risk in Communities Study, including 4,614 participants.
- Measured high-sensitivity C-reactive protein (CRP) at three time points spanning 21 years prior to depression assessment.
- Categorized participants into four CRP longitudinal patterns (stable low, unstable low, unstable elevated, stable elevated) and assessed depression using the CESD scale.
Main Results:
- Participants with persistently elevated CRP (stable elevated) or intermittently elevated CRP (unstable elevated) showed significantly higher depression symptoms in late life compared to those with stable low CRP.
- The association between stable elevated CRP and greater late-life depression symptoms remained significant after excluding individuals with late-life cognitive impairment.
- Stable elevated CRP was also linked to an increased risk of clinically significant late-life depression.
Conclusions:
- Chronic or repeated systemic inflammation in midlife is a significant predictor of depression in older adulthood.
- This association is evident even in individuals without cognitive impairment, suggesting a direct link between inflammation and mood.
- Findings underscore the importance of monitoring and managing inflammation throughout adulthood to promote healthy aging and prevent late-life depression.
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