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Time course of pulmonary response of rats to inhalation of crystalline silica: histological results and biochemical indices of damage, lipidosis, and fibrosis.

Authors
Porter-DW; Ramsey-D; Hubbs-AF; Battelli-L; Ma-J; Barger-M; Landsittel-D; Robinson-VA; McLaurin-J; Khan-A; Jones-W; Teass-A; Castranova-V
Source
J Environ Pathol Toxicol Oncol 2001 Jan; 20(Suppl 1):1-14
NIOSHTIC No.
20021840
Abstract
Previous studies have determined that alpha-quartz (crystalline silica) can cause pulmonary inflammation, damage, and fibrosis. However, the temporal relationship between silica inhalation and pulmonary inflammation, damage, and fibrosis has not been fully examined. To address this gap in our knowledge of silica-induced pulmonary fibrosis, a chronic inhalation study using rats was designed. Specifically, rats were exposed to a silica aerosol (15 mg/m3 silica, 6 h/d, 5 d/wk, 116 d), and measurements of pulmonary inflammation, damage, and fibrosis were monitored throughout the study. We report (1) data demonstrating that the silica aerosol generation and exposure system produced a consistent silica aerosol of respirable size particles; (2) the time course of silica deposition in the lung; (3) calculations that demonstrate that the rats were not in pulmonary overload; (4) histopathological data demonstrating time-dependent enhancement of silica-induced alveolitis, epithelial hypertrophy and hyperplasia, alveolar lipoproteinosis, and pulmonary fibrosis in the absence of overload; and (5) biochemical data documenting the development of lipidosis, lung damage, and fibrosis.
Keywords
Quartz-dust; Silica-dusts; Inhalation-studies; Silicosis; Pulmonary-system; Fibrosis; Exposure-levels; Author Keywords: alpha-quartz; silica; inhalation exposure; silicosis; pulmonary fibrosis
CODEN
JEPOEC
CAS No.
7631-86-9; 14808-60-7
Publication Date
20010101
Document Type
Journal Article
Editors
Moran-EM
Fiscal Year
2001
NTIS Accession No.
NTIS Price
ISSN
0731-8898
NIOSH Division
HELD
Source Name
Journal of Environmental Pathology, Toxicology, and Oncology
State
WV
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