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Lung oxidative response after acute coal dust exposure
Ricardo A Pinho1, Fernanda Bonatto, Michael Andrades
1Laboratório de Estresse Oxidativo/Departamento de Bioquímica/UFRGS, Ramiro Barcelos, 2600 (anexo), 90620-050 Porto Alegre, Brazil. pinho@unesc.rct.sc.br
Environmental Research
|September 15, 2004
Summary
Coal dust exposure causes biphasic lung inflammation and oxidative damage. This study in rats reveals early lymphocyte infiltration followed by macrophage aggregation, with increased oxidative stress markers indicating long-term lung injury.
Area of Science:
- Pulmonary toxicology
- Environmental health
- Cellular and molecular pathology
Background:
- Coal dust exposure is a known cause of acute and chronic lung inflammation.
- Reactive oxygen species (ROS) are implicated in the pathogenesis of pulmonary diseases.
- Understanding the temporal effects of coal dust on lung parenchyma is crucial for disease prevention.
Purpose of the Study:
- To investigate the acute and chronic effects of coal dust exposure on rat lung parenchyma.
- To elucidate the role of reactive oxygen species in coal dust-induced lung damage.
- To characterize the biphasic inflammatory response in the lungs following coal dust instillation.
Main Methods:
- Intratracheal instillation of coal dust in Wistar rats, with groups assessed at 48 hours, 7, 30, and 60 days post-exposure.
- Biochemical assays for lipid peroxidation (TBARS), protein oxidation (carbonyl groups), total radical-trapping antioxidant parameter (TRAP), catalase, and superoxide dismutase (SOD) activity.
- Histological evaluation of lung tissue to assess inflammatory cell infiltration and lymphoid hyperplasia.
Main Results:
- Coal dust induced a biphasic inflammatory response: initial lymphocyte infiltration (48h-7 days) followed by chronic macrophage aggregation (30 days), with resolution by 60 days.
- Oxidative stress was evident, with increased protein carbonyls at all time points and elevated TBARS at 60 days.
- A decrease in total radical-trapping antioxidant parameter (TRAP) was observed during both acute and chronic phases, alongside superoxide dismutase (SOD) activation at 60 days.
Conclusions:
- Coal dust exposure triggers a biphasic inflammatory response in the lung parenchyma.
- Oxidative damage, indicated by lipid peroxidation and protein oxidation, plays a significant role in coal dust-induced lung injury.
- The findings highlight the persistent oxidative stress and inflammatory cascade following coal dust exposure, contributing to chronic pulmonary disease development.