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[Study on mouse pulmonary acute injury induced by air-borne PM2.5]
Zhihai Jiang1, Weimin Song, Xiaoyu Zhou
1Department of Environment Health, School of Public Health, Fudan University, Shanghai 200032, China.
Objective:
In order to study the acute toxicity of PM2.5 and to explore the role of immunoreaction and oxidative stress in mouse pulmonary acute injury induced by PM2.5.
Methods:
Kunming mice were randomly divided into five groups including blank control group, saline control group, three level PM2.5 (low, middle and high) groups. Three level PM2.5 groups were inoculated with suspensions of PM2.5 via trachea for 24 hours and saline control group were inoculated saline, Pulmonary pathological injury and bronchoalveolar lavage fluid (BALF) of all mice were later examined, including the level of LDH, AKP, ACP, ALB, NO, NOS, MDA, SOD, activities of TNF-alpha, IL-1 and phagocytosis of Alveolar macrophages (AM).
Results:
The amount of LDH, AKP, ACP, ALB, NO, NOS, MDA and activities of TNF-alpha, IL-1 in exposed groups were significantly higher than those in control(P < 0.05), and at the same time the amount of SOD and phagocytosis of AM decreased significantly (P < 0.05). Dose-response relationships were observed in all indexes.
Conclusion:
Air-borne PM2.5 could have acute toxic effects on mouse pulmonary cells and membrane tissues via immunotoxicity and oxidative stress injury.
Insights
Exposure to fine particulate matter (PM2.5) causes acute lung injury in mice, primarily through immunotoxicity and oxidative stress. These findings highlight the harmful effects of air pollution on respiratory health.
Area of Science:
- Environmental toxicology
- Pulmonary medicine
- Immunology
Context:
- Particulate matter (PM2.5) is a major air pollutant linked to respiratory diseases.
- The mechanisms of PM2.5-induced acute lung injury are not fully understood.
- Investigating the roles of immunoreaction and oxidative stress is crucial.
Purpose:
- To investigate the acute toxicity of PM2.5 in mouse lungs.
- To explore the involvement of immunoreaction and oxidative stress in PM2.5-induced pulmonary injury.
- To assess pathological changes and biochemical markers in bronchoalveolar lavage fluid.
Summary:
- Kunming mice exposed to PM2.5 via trachea showed significant increases in LDH, AKP, ACP, ALB, NO, NOS, MDA, TNF-alpha, and IL-1.
- Simultaneously, SOD levels and alveolar macrophage phagocytosis decreased significantly in PM2.5-exposed groups.
- A clear dose-response relationship was observed for all measured indicators.
Impact:
- Air-borne PM2.5 induces acute toxic effects on mouse pulmonary cells and membrane tissues.
- Immunotoxicity and oxidative stress are key mechanisms underlying PM2.5-induced lung injury.
- This study provides insights into the health risks associated with PM2.5 exposure.
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