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Disease surveillance is the systematic collection, analysis, and interpretation of health data essential to the planning, implementation, and evaluation of public health practice. This process integrates data dissemination to entities responsible for preventing and controlling disease, injury, and disability. Surveillance systems provide crucial information for action, helping public health authorities make informed decisions to manage and prevent outbreaks, ensure public safety, optimize...
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Summary
This summary is machine-generated.

Fine particulate matter (PM2.5) exposure is linked to brain changes, specifically reduced cortical thickness in the superior temporal gyrus in healthy adults. Air pollution effects on brain structure vary across the lifespan and by sex.

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Area of Science:

  • Neuroscience
  • Environmental Health
  • Radiology

Background:

  • Exposure to fine particulate matter (PM2.5) is a known risk factor for accelerated brain aging and dementia.
  • Understanding the impact of PM2.5 on specific brain structures like cortical thickness is crucial for public health.

Purpose of the Study:

  • To investigate the association between residential PM2.5 exposure and regional cortical thickness (CTh) across diverse international datasets.
  • To explore how age and sex modify the relationship between PM2.5 exposure and CTh.

Main Methods:

  • Utilized data from 2,086 adults across seven international cohorts.
  • Assessed PM2.5 exposure using satellite-based estimates averaged over three years prior to MRI.
  • Employed linear mixed models to analyze associations between PM2.5 and CTh, adjusting for multiple covariates and including cohort/scanner as random effects.

Main Results:

  • PM2.5 exposure showed an inverse association with CTh in the superior temporal gyrus (STG) among cognitively unimpaired controls.
  • A significant quadratic effect of PM2.5 on CTh was observed across the lifespan, with different associations at younger, midlife, and older ages.
  • Sex-specific interactions revealed that PM2.5 was inversely associated with CTh in males but not females in several frontal regions.

Conclusions:

  • PM2.5 exposure is specifically associated with reduced CTh in the STG of healthy older adults.
  • The quadratic age-by-exposure interaction suggests a complex, potentially biphasic neurodegenerative process related to air pollution.
  • Observed sex differences in PM2.5 effects on CTh warrant further investigation into potential interactions with sexual dimorphism and air pollution.