Neurodevelopmental toxicity induced by PM2.5 Exposure and its possible role in Neurodegenerative and mental disorders.
Level 5 - mechanism / opinion, no new human data
Narrative review of human and animal literature without systematic methodology or primary human data generation.
PubMed 37537902 · doi:10.1177/09603271231191436
What was done
This was a narrative literature review analyzing published human and animal studies to summarize the neurotoxic effects of ambient fine particulate matter (PM2.5) on the central nervous system. The review examined entry pathways (blood-brain barrier, olfactory system, gut-brain axis), biological mechanisms (oxidative stress, systemic inflammation, gut flora dysbiosis, epigenetic changes), associated conditions, and proposed therapeutic targets.
What was found
The abstract reports no quantitative metrics or effect sizes. It qualitatively describes associations between PM2.5 exposure and neurodevelopmental disorders (autism spectrum disorders), neurodegenerative diseases (Alzheimer's and Parkinson's diseases), and mental disorders (schizophrenia, depression, bipolar disorder). Mechanistic findings highlighted include microglial overactivation, DNA hypomethylation, and dysregulation of PKA/CREB/BDNF and WNT/β-catenin pathways.
Why it matters
This review synthesizes the mechanistic pathways through which fine particulate air pollution may contribute to central nervous system damage and neuropsychiatric pathology.
Limits
The abstract describes a narrative review without systematic search protocols, meta-analytic pooling, or formal quality grading. Human and animal findings are aggregated together, and no quantitative estimates or sample sizes are provided.
Cited by
- supports PM2.5 particles can be inhaled directly through the nose into the brain and induce neuroinflammation.