Related Experiment Video
Updated: Aug 10, 2026
Acupuncture in a Rat Model of Asthma
Published on: August 25, 2020
[Applications of a rat model of chronic bronchitis on toxicity of PM2.5]
Qiang Cao1, Wei-min Song, Si-ya A
1School of Public Health of Fudan University, Shanghai 200032, China.
Objective:
To study the acute toxicity of PM2.5 to the rats with chronic bronchitis and the control rats and the difference between the model rats and the control rats on PM2.5 toxicity.
Methods:
With the use of an intratracheal instillation, both groups were exposed to suspensions of PM2.5. After three times, the levels of ALB, LDH, AKP, MDA and GSH in bronchoalveolar lavage fluid (BALF) were analyzed.
Results:
PM2.5 could induce the acute toxicity to both model rats and control rats, and dose-response relationships were observed in all indexes. In model rats, the levels of ALB, LDH, AKP, and MDA were higher in control rats( P < 0.05), while the levels of GSH were lower in control rats (P < 0.05).
Conclusion:
PM2.5 could have acute toxic effects on both model rats and health rats, and the rats with chronic bronchitis are more susceptible to PM2.5 than health rats.
Insights
Fine particulate matter (PM2.5) causes acute toxicity in both healthy and chronic bronchitis rats. Rats with chronic bronchitis exhibit increased susceptibility to PM2.5 exposure.
Area of Science:
- Environmental Health
- Toxicology
- Pulmonary Medicine
Context:
- Particulate matter (PM2.5) is a major air pollutant with known health risks.
- Chronic bronchitis is a prevalent respiratory condition that may alter susceptibility to environmental toxins.
- Understanding the differential toxicity of PM2.5 is crucial for public health risk assessment.
Purpose:
- To investigate the acute toxic effects of PM2.5 exposure on rats with induced chronic bronchitis compared to healthy control rats.
- To determine if pre-existing chronic bronchitis influences the severity of PM2.5-induced toxicity.
- To analyze specific biomarkers in bronchoalveolar lavage fluid (BALF) to quantify cellular damage and oxidative stress.
Summary:
- Both healthy and chronic bronchitis rat models were exposed to PM2.5 via intratracheal instillation.
- Biomarkers including albumin (ALB), lactate dehydrogenase (LDH), alkaline phosphatase (AKP), malondialdehyde (MDA), and glutathione (GSH) were measured in BALF.
- PM2.5 induced dose-dependent acute toxicity in both groups, with significantly higher levels of ALB, LDH, AKP, and MDA, and lower GSH levels observed in the chronic bronchitis model rats compared to controls.
Impact:
- PM2.5 exposure poses acute toxic risks to both healthy individuals and those with chronic respiratory diseases.
- Individuals with chronic bronchitis demonstrate heightened vulnerability to the adverse effects of PM2.5.
- These findings underscore the importance of air quality management, particularly for vulnerable populations suffering from chronic lung conditions.
