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Chronic inhalation of short asbestos: lung fiber burdens and histopathology for monkeys maintained for 11.5 years after exposure.

Authors
Stettler-LE; Sharpnack-DD; Krieg-EF
Source
Inhal Toxicol 2008 Jan; 20(1):63-73
NIOSHTIC No.
20033237
Abstract
In an earlier report, Platek et al. (1985) presented the results of an 18-month inhalation exposure of rats and monkeys to short chrysotile asbestos. The mean chamber exposure level was 1.0 mg/m3with an average of 0.79 fibers/ml > 5 m in length. Gross and histopathological examination of exposed and control rats indicated no treatment-related lesions. Asbestos bodies adjacent to the terminal bronchioles, but no fibrosis, were found in lung biopsy tissue taken from the exposed monkeys at 10 months post-exposure. Fifteen monkeys (9 exposed and 6 controls) from this study were maintained for 11.5 years following exposure. Lung fiber burdens were determined by transmission electron microscopy. The mean lung burden ( standard deviation) for 59 samples from exposed monkeys was 63 30 10(6) fibers/g dry lung (range, 18-139 10(6)). The geometric mean fiber length was 3.5 microm with 35% of the fibers being > 5 microm in length. These data indicate some chrysotile fibers are durable in vivo for a significant period of time. Lungs were examined grossly and microscopically. No lesions attributable to the inhalation exposure were noted. Asbestos bodies were seen in the lungs of treated monkeys, primarily in the interstitium near bronchioles or small pulmonary blood vessels (which also may have been near to bronchioles just out of the plane of section).
Keywords
Airborne-dusts; Respiratory-irritants; Pulmonary-function; Respiration; Pulmonary-congestion; Lung; Toxicology; Lung-function; Lung-cells; Toxic-materials; Toxic-effects; Laboratory-animals; Animal-studies; Animals
CODEN
INHTE5
CAS No.
1332-21-4; 12001-29-5
Publication Date
20080101
Document Type
Journal Article
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0895-8378
NIOSH Division
DART
Source Name
Inhalation Toxicology
State
OH
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