Journal article
Patterns of inflammation, cell proliferation, and related gene expression in lung after inhalation of chrysotile asbestos
The American journal of pathology, Vol.147(3), pp.728-739
09/1995
PMCID: PMC1870980
PMID: 7677184
Abstract
Biochemical and molecular markers of inflammation, cell proliferation, and pulmonary fibrosis were studied in lungs and bronchoalveolar lavage preparations from Fischer 344 rats at time periods from 3 to 20 days after inhalation of two airborne concentrations (0.18 and 8.2 mg/m3 air) of chrysotile asbestos. Additional groups of animals were examined for lung histopathology and cell proliferation with an antibody to 5-bromo-2'-deoxyuridine after exposure to asbestos for 5 and 20 days and after 20 days of exposure followed by an additional 20 days in room air. Exposure to chrysotile at the higher concentration caused protracted increases in steady-state mRNA levels of manganese-containing superoxide dismutase and elevation in glyceraldehyde-3-phosphate dehydrogenase mRNA at 3 days, but levels of mRNAs encoding copper-zinc-containing superoxide dismutase, ornithine decarboxylase, and the proto-oncogene, c-jun were not statistically elevated from levels occurring in lung homogenates from sham control rats. Differential cell counts in bronchoalveolar lavage revealed an early infiltration of neutrophils that correlated with focal areas of increased cellularity and fibrosis in rat lungs at the higher concentrations of asbestos. However, elevations in lung hydroxyproline were not observed. Significant increases in epithelial cells of the bronchi, the interstitial compartment of the lung, and mesothelial cells incorporating 5-bromo-2'-deoxyuridine, an indication of DNA synthesis, were noted in the higher chrysotile group at 5 days, but labeling in all cell compartments was comparable with that occurring in sham controls at later time points. Indicators of inflammation, increased cell proliferation, and pulmonary fibrosis were not observed in the lungs of rats exposed to the lower concentration of chrysotile. Thus, results indicate that cellular and molecular markers of inflammation and proliferation in lung are dose-related and indicative of the histopathological development of asbestosis.
Details
- Title: Subtitle
- Patterns of inflammation, cell proliferation, and related gene expression in lung after inhalation of chrysotile asbestos
- Creators
- T. R Quinlan - Department of Pathology, University of Vermont, Burlington 05405, USAK. A BéruBé - Department of Pathology, University of Vermont, Burlington 05405, USAJ. P Marsh - Department of Pathology, University of Vermont, Burlington 05405, USAY. M Janssen - Department of Pathology, University of Vermont, Burlington 05405, USAP Taishi - Department of Pathology, University of Vermont, Burlington 05405, USAK. O Leslie - Department of Pathology, University of Vermont, Burlington 05405, USAD Hemenway - Department of Pathology, University of Vermont, Burlington 05405, USAP. T O'Shaughnessy - Department of Pathology, University of Vermont, Burlington 05405, USAP Vacek - Department of Pathology, University of Vermont, Burlington 05405, USAB. T Mossman - Department of Pathology, University of Vermont, Burlington 05405, USA
- Resource Type
- Journal article
- Publication Details
- The American journal of pathology, Vol.147(3), pp.728-739
- PMID
- 7677184
- PMCID
- PMC1870980
- ISSN
- 0002-9440
- eISSN
- 1525-2191
- Language
- English
- Date published
- 09/1995
- Academic Unit
- Civil and Environmental Engineering; Occupational and Environmental Health
- Record Identifier
- 9984214949102771
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