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Exposure to crystalline silica or treatment with chlorphentermine increases vitamin E levels in rat alveolar lavage materials.

Authors
Miles-PR; Bowman-L; Reasor-MJ
Source
J Toxicol Environ Health, A 1996 Dec; 49(5):511-523
NIOSHTIC No.
20034127
Abstract
Previous studies have shown that vitamin E may be an integral part of lung surfactant and may function to protect this material from oxidant damage. Therefore, we measured the vitamin E levels in alveolar lavage materials from rats exposed to crystalline silica or treated with chlorphentermine (CP) , two treatments that are known to increase surfactant phospholipids (PL) by different mechanisms. Silica exposure leads to increased PL synthesis, and CP treatment causes a reduction in PL degradation. Two different silica preparations, HCl-washed and unwashed silica, were used because exposure to each of them leads to different degrees of phospholipidosis. Exposure to HCl-washed silica results in a more than 17-fold increase in lavage PL and protein levels and a 12.2-fold increase in the amount of vitamin E. Exposure to unwashed silica leads to an approximately 7-fold increase in PL and proteins and a 5.8- fold increase in lavage vitamin E. Following treatment of rats with CP, there is a 15- to 19- fold increase in lavage PL and proteins and a 13.6-fold increase in vitamin E. When the results are expressed as micrograms vitamin E per milligram of lavage PL or protein, there is not much difference between controls and each treatment group. Because surfactant synthesis occurs in the endoplasmic reticulum, we also measured vitamin E in lung microsomes. Both silica exposure and CP treatment also lead to 1.8- to 2.5-fold increases, respectively, in the lung microsomal levels of vitamin E. These results demonstrate that alveolar lavage vitamin E levels are elevated along with lavage PL and proteins, and lung microsomal vitamin E levels are increased following exposure of rats to silica or treatment of the animals with CP.
Keywords
Silicates; Silicon-compounds; Vitamins; Lung-cells; Lung-fibrosis; Lung-function; Lung-irritants; Laboratory-animals; Pulmonary-disorders; Pulmonary-function; Pulmonary-system
Contact
Philip R. Miles, PhD, NIOSH, Physiology Section, Rm. 207, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
JTEHD6
Publication Date
19961201
Document Type
Journal Article
Fiscal Year
1997
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
1528-7394
NIOSH Division
DRDS
Source Name
Journal of Toxicology and Environmental Health, Part A: Current Issues
State
WV
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