PM2.5 induces developmental neurotoxicity in cortical organoids

Area of Science:

• Neuroscience
• Developmental Toxicology
• Environmental Health

Background:

• Particulate matter (PM2.5) exposure is linked to neurodevelopmental toxicity, crossing placental and blood-brain barriers.
• Existing 2D cell and animal models do not accurately reflect human brain development, obscuring PM2.5's precise neurotoxic mechanisms.
• A need exists for advanced models to study PM2.5's impact on human brain development.

Purpose of the Study:

• To investigate the mechanisms of PM2.5-induced neurotoxicity in human brain development.
• To utilize three-dimensional (3D) cortical organoids that mimic early human cerebral cortex development.
• To assess PM2.5's effects on neuronal apoptosis, differentiation, and molecular pathways.

Main Methods:

• Development of 3D human cortical organoids expressing cortical layer proteins.
• Exposure of organoids to PM2.5 at concentrations of 5 μg/mL and 50 μg/mL.
• Analysis of neuronal apoptosis, neural differentiation, and gene expression (transcriptomics).

Main Results:

• PM2.5 exposure induced significant neuronal apoptosis and disrupted normal neural differentiation.
• Transcriptomic analysis revealed PM2.5-induced aberrations in mitochondrial complex I functionality.
• Observed effects suggest potential links to Parkinson's syndrome, misguided axon guidance, and compromised synaptic maintenance.

Conclusions:

• 3D cortical organoids provide a robust model for assessing PM2.5 neurotoxicity in human brain development.
• PM2.5 exposure detrimentally impacts neurodevelopment through apoptosis and differentiation disruption.
• Findings highlight the need for stringent air pollution control policies to protect public health, particularly in China.