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Updated: Jul 10, 2026
Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity
Published on: October 25, 2016
The cellular and genomic response of an immortalized microglia cell line (BV2) to concentrated ambient particulate
Preethi Sama1, Thomas C Long, Susan Hester
1Department of Environmental Science and Engineering, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, USA.
Abstract:
Ambient particulate matter (PM) damages pulmonary tissue through oxidative stress (OS) pathways. Several reports indicate that the brain is another affected target of PM exposure. Since microglia (brain macrophages) are critical to OS-mediated neurodegeneration, the cellular and genomic response of immortalized mouse microglia (BV2) was examined in response to fine (
Insights
High potency ambient particles, rich in nickel and vanadium, trigger significant inflammatory and immune responses in brain microglia. Low potency particles impact cellular maintenance pathways, highlighting differential effects of air pollution on brain cells.
Area of Science:
- Environmental Health
- Neuroscience
- Toxicology
Background:
- Ambient particulate matter (PM) exposure is linked to pulmonary damage via oxidative stress (OS).
- Emerging evidence suggests PM also affects the brain, with microglia (brain macrophages) playing a key role in OS-mediated neurodegeneration.
Purpose of the Study:
- To investigate the cellular and genomic responses of immortalized mouse microglia (BV2) to concentrated ambient particles (CAPs).
- To differentiate the effects of high potency (HP) and low potency (LP) CAPs, correlating potency with nickel and vanadium content.
Main Methods:
- BV2 microglia were exposed to LP and HP CAPs collected from Tuxedo, NY.
- Assessed cellular effects including ATP levels, mitochondrial membrane potential, and glutathione/nonprotein sulfhydryl levels.
- Measured proinflammatory cytokine release (TNF-alpha, IL-6) and performed microarray analysis to identify differentially expressed genes.
Main Results:
- LP CAPs reduced ATP levels and depolarized mitochondria; both HP and LP CAPs affected glutathione and nonprotein sulfhydryl levels.
- Both CAP types stimulated the release of tumor necrosis factor-alpha and interleukin-6.
- Microarray analysis revealed 3200 genes affected by HP CAPs (enriched in inflammatory/innate immunity pathways) and 160 genes by LP CAPs (related to cellular maintenance).
Conclusions:
- High potency CAPs, characterized by higher nickel and vanadium content, induce a more pronounced inflammatory response in microglia.
- HP CAPs selectively upregulate inflammatory and innate immunity pathways, suggesting a significant neuroinflammatory risk.
- LP CAPs primarily impact pathways related to cellular maintenance and division.
