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Published on: July 12, 2024
Characteristics and cellular effects of ambient particulate matter from Beijing
Yan Lu1, Shu Su1, Wenjie Jin1
1Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, PR China.
Abstract:
In vitro tests using human adenocarcinomic alveolar epithelial cell line A549 and small mouse monocyte-macrophage cell line J774A.1 were conducted to test toxicity of six PM (particulate matter) samples from Beijing. The properties of the samples differ significantly. The production of inflammatory cytokine (TNF-α for J774A.1) and chemokine (IL-8 for A549) and the level of intracellular reactive oxygen species (ROS) were used as endpoints. There was a positive correlation between water soluble organic carbon and DTT-based redox activity. Both cell types produced increased levels of inflammatory mediators and had higher level of intracelllar ROS, indicating the presence of PM-induced inflammatory response and oxidative stress, which were dose-dependent and significantly different among the samples. The releases of IL-8 from A549 and TNF-α from J774A.1 were significantly correlated to PM size, Zeta potential, endotoxin, major metals, and polycyclic aromatic hydrocarbons. No correlation between ROS and these properties was identified.
Insights
Particulate matter (PM) from Beijing induced inflammatory responses and oxidative stress in lung and immune cells. PM properties like size and chemical composition correlated with inflammatory mediator release but not reactive oxygen species.
Area of Science:
- Environmental Health
- Toxicology
- Cell Biology
Background:
- Particulate matter (PM) air pollution poses significant health risks.
- Understanding PM toxicity mechanisms is crucial for public health.
- Beijing experiences high levels of PM, necessitating local toxicity assessments.
Purpose of the Study:
- To evaluate the in vitro toxicity of diverse Beijing particulate matter (PM) samples.
- To investigate PM-induced inflammatory responses and oxidative stress in human and mouse cell lines.
- To identify correlations between PM properties and cellular toxicity endpoints.
Main Methods:
- In vitro exposure of human A549 lung cells and mouse J774A.1 macrophage cells to six distinct PM samples.
- Measurement of inflammatory cytokine (TNF-α) and chemokine (IL-8) production.
- Quantification of intracellular reactive oxygen species (ROS) levels.
- Analysis of PM properties including size, Zeta potential, endotoxin, metals, and polycyclic aromatic hydrocarbons.
Main Results:
- Both cell lines exhibited dose-dependent increases in inflammatory mediators and intracellular ROS, indicating PM-induced toxicity.
- Significant variations in toxicity were observed among the different PM samples.
- Release of IL-8 and TNF-α correlated positively with PM size, Zeta potential, endotoxin, metals, and PAHs.
- Water-soluble organic carbon showed a positive correlation with DTT-based redox activity.
Conclusions:
- Beijing's particulate matter samples induce significant inflammatory responses and oxidative stress in lung and immune cells.
- PM-induced inflammation is linked to specific physicochemical properties, including size and chemical composition.
- Reactive oxygen species generation did not correlate with the investigated PM properties, suggesting complex mechanisms.
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