Related Experiment Video
Updated: Feb 25, 2026
Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
Published on: July 12, 2024
Mitochondrial dysfunction and inflammatory response in the cytotoxicity of NR8383 macrophages induced by fine
1Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan City, Hubei Province, 430000, China.
Abstract:
Exposure to fine particulate matter (fine PM) is known to cause severe public health problems. However, the potential mechanisms of alveolar macrophages cytotoxicity induced by fine PM exposure are still unclear. The aim of this study was to determine if both the mitochondrial dysfunction and the inflammatory response of NR8383 macrophages were triggered by Standard Reference Material 2786 (SRM 2786) for fine PM. NR8383 cells were exposed to different concentrations of SRM 2786, mitochondrial membrane potential, ultrastructure of mitochondria, activities of caspase 3/9, release of IL-6/TNF-α, expression of NF-κB and IκBα were evaluated. The results indicated that SRM 2786 induced mitochondrial dysfunction by increasing activities of caspase-3 and caspase-9, and structural damages of mitochondria with dissipation of mitochondrial membrane potential. The inflammatory response was triggered as evidenced by increased release of IL-6/TNF-α, and increased protein expression of NF-κB with decreased protein expression of IκBα. Consequently, these data indicate that both mitochondrial dysfunction and inflammatory responses might be responsible for SRM 2786 induced macrophage cytotoxicity.
Insights
Fine particulate matter (PM) exposure causes macrophage damage. This study shows Standard Reference Material 2786 (SRM 2786) triggers mitochondrial dysfunction and inflammation in NR8383 cells, leading to cytotoxicity.
Area of Science:
- Environmental Health
- Cell Biology
- Toxicology
Background:
- Fine particulate matter (PM) exposure poses significant public health risks.
- Mechanisms underlying fine PM-induced macrophage cytotoxicity remain incompletely understood.
Purpose of the Study:
- To investigate if Standard Reference Material 2786 (SRM 2786) for fine PM induces mitochondrial dysfunction and inflammatory responses in NR8383 macrophages.
- To elucidate the cellular pathways involved in fine PM-induced macrophage toxicity.
Main Methods:
- NR8383 macrophages were exposed to varying concentrations of SRM 2786.
- Assessed mitochondrial membrane potential, mitochondrial ultrastructure, caspase-3/9 activity, IL-6/TNF-α release, and NF-κB/IκBα protein expression.
Main Results:
- SRM 2786 exposure led to mitochondrial dysfunction, evidenced by increased caspase-3/9 activity, mitochondrial structural damage, and membrane potential dissipation.
- An inflammatory response was observed, indicated by elevated IL-6/TNF-α release and increased NF-κB with decreased IκBα protein expression.
Conclusions:
- SRM 2786 induces macrophage cytotoxicity through a combination of mitochondrial dysfunction and inflammatory responses.
- These findings provide insights into the toxicological mechanisms of fine PM exposure on alveolar macrophages.
