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Role of metal-induced reactive oxygen species generation in lung responses caused by residual oil fly ash
- Source :
- Journal of biosciences. 28(1)
- Publication Year :
- 2003
-
Abstract
- Inhalation of residual oil fly ash (ROFA) increases pulmonary morbidity in exposed workers. We examined the role of reactive oxygen species (ROS) in ROFA-induced lung injury. ROFA was collected from a precipitator at Boston Edison Co., Everett, MA, USA. ROFA (ROFA-total) was suspended in saline, incubated for 24 h at 37 degrees C, centrifuged, and separated into its soluble (ROFA-sol.) and insoluble (ROFA-insol.) fractions. Sprague-Dawley rats were intratracheally instilled with saline or ROFA-total or ROFA-sol. or ROFA-insol. (1 mg/100 g body wt.). Lung tissue and bronchoalveolar lavage cells were harvested at 4, 24, and 72 h after instillation. Chemiluminescence (CL) of recovered cells was measured as an index of ROS production, and tissue-lipid-peroxidation was assessed to determine oxidative injury. Significant amounts of Al, Fe, and Ni were present in ROFA-sol., whereas ROFA-insol. contained Fe, V, and Al. Using electron spin resonance (ESR), significantly more hydroxyl radicals were measured in ROFA-sol. as compared to ROFA-insol. None of the ROFA samples had an effect on CL or lipid peroxidation at 4 h. Treatment with ROFA-total and ROFA-insol. caused significant increases in both CL (at 24 h) and lipid peroxidation (at 24 and 72 h) when compared to saline control value. ROFA-sol. significantly reduced CL production at 72 h after treatment and had no effect on lipid peroxidation at any time point. In summary, ROFA, particularly its soluble fraction, generated a metal-dependent hydroxyl radical as measured by a cell-free ESR assay. However, cellular oxidant production and tissue injury were observed mostly with the ROFA-total and ROFA-insol. particulate forms. ROS generated by ROFA-sol. as measured by ESR appear not to play a major role in the lung injury caused after ROFA exposure.
- Subjects :
- Lung Diseases
Male
Time Factors
medicine.medical_treatment
Radical
Lung injury
Coal Ash
General Biochemistry, Genetics and Molecular Biology
Lipid peroxidation
Rats, Sprague-Dawley
chemistry.chemical_compound
medicine
Organic chemistry
Animals
Saline
chemistry.chemical_classification
Reactive oxygen species
Air Pollutants
medicine.diagnostic_test
Inhalation
Chemistry
Electron Spin Resonance Spectroscopy
General Medicine
Carbon
Rats
Disease Models, Animal
Bronchoalveolar lavage
Solubility
Metals
Luminescent Measurements
Hydroxyl radical
Particulate Matter
Lipid Peroxidation
General Agricultural and Biological Sciences
Reactive Oxygen Species
Bronchoalveolar Lavage Fluid
Nuclear chemistry
Subjects
Details
- ISSN :
- 02505991
- Volume :
- 28
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Journal of biosciences
- Accession number :
- edsair.doi.dedup.....ecd6c521447f271369e614047a5bb79f