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Metals, Nanoparticles, Particulate Matter, and Cognitive Decline.

Lilian Calderón-Garcidueñas1,2, Diana A Chávez-Franco2, Samuel C Luévano-Castro2

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Exposure to metal-rich particulate matter (PM2.5) significantly impairs cognitive function, especially in older adults residing in polluted areas like Metropolitan Mexico City. Reducing PM2.5 and metal emissions is crucial for brain health and preventing cognitive decline.

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Area of Science:

  • Environmental Health
  • Neuroscience
  • Toxicology

Background:

  • Ubiquitous metal exposure from diverse sources poses health risks.
  • Particulate matter (PM2.5) exposure is linked to cognitive decline, dementia, and Alzheimer's disease (AD).
  • Heavy-duty diesel vehicles are significant emitters of metal-rich PM2.5 in Metropolitan Mexico City (MMC).

Purpose of the Study:

  • To investigate cognitive impairment in relation to PM2.5 exposure in a Mexican population.
  • To assess the impact of age and residency in polluted areas on cognitive performance.
  • To identify factors influencing cognitive function in a middle-class population.

Main Methods:

  • Cognitive function was assessed using the Montreal Cognitive Assessment (MoCA) in 336 healthy Mexican volunteers.
  • Participants' ages ranged from 29.2 ± 13.3 years with 13.7 ± 2.4 years of education.
  • MoCA scores were analyzed based on age, residency in polluted vs. low-pollution areas, and education level.

Main Results:

  • Approximately 74% of the young middle-class population exhibited cognitive deficits (MoCA ≤ 25).
  • MMC residents aged ≥31 years showed significantly lower MoCA scores (20.4 ± 3.4) compared to low-pollution controls (25.2 ± 2.4, p < 0.0001).
  • Higher years of formal education positively correlated with higher MoCA scores across all participants (p < 0.0001).

Conclusions:

  • Residency in PM2.5-polluted cities negatively impacts multi-domain cognitive performance.
  • Urgent need to identify and reduce pollutants affecting neural health and monitor cognitive trajectories.
  • Prioritizing PM2.5 emission control, targeting metal emissions, and implementing early neuroprevention interventions are recommended.