Asbestos-induced lung inflammation and epithelial cell proliferation are altered in myeloperoxidase-null mice

Asbestos fibers are carcinogens causing oxidative stress and inflammation, but the sources and ramifications of oxidant production by asbestos are poorly understood. Here, we show that inhaled chrysotile asbestos fibers cause increased myeloperoxidase activity in bronchoalveolar lavage fluids (BALF)...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2005-11, Vol.65 (21), p.9670-9677
Hauptverfasser: HAEGENS, Astrid, VAN DER VLIET, Albert, MOSSMAN, Brooke T, BUTNOR, Kelly J, HEINTZ, Nicholas, TAATJES, Douglas, HEMENWAY, David, VACEK, Pamela, FREEMAN, Bruce A, HAZEN, Stanley L, BRENNAN, Marie Luise
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container_issue 21
container_start_page 9670
container_title Cancer research (Chicago, Ill.)
container_volume 65
creator HAEGENS, Astrid
VAN DER VLIET, Albert
MOSSMAN, Brooke T
BUTNOR, Kelly J
HEINTZ, Nicholas
TAATJES, Douglas
HEMENWAY, David
VACEK, Pamela
FREEMAN, Bruce A
HAZEN, Stanley L
BRENNAN, Marie Luise
description Asbestos fibers are carcinogens causing oxidative stress and inflammation, but the sources and ramifications of oxidant production by asbestos are poorly understood. Here, we show that inhaled chrysotile asbestos fibers cause increased myeloperoxidase activity in bronchoalveolar lavage fluids (BALF) and myeloperoxidase immunoreactivity in epithelial cells lining distal bronchioles and alveolar ducts, sites of initial lung deposition of asbestos fibers. In comparison with sham mice, asbestos-exposed myeloperoxidase-null (MPO-/-) and normal (MPO+/+) mice exhibited comparable increases in polymorphonuclear leukocytes, predominately neutrophils, in BALF after 9 days of asbestos inhalation. Differential cell counts on BALF revealed decreased proportions of macrophages and increased lymphocytes in all mice exposed to asbestos, but numbers were decreased overall in asbestos-exposed myeloperoxidase-null versus normal mice. Asbestos-associated lung inflammation in myeloperoxidase-null mice was reduced (P < or = 0.05) in comparison with normal asbestos-exposed mice at 9 days. Decreased lung inflammation in asbestos-exposed myeloperoxidase-null mice at 9 days was accompanied by increases (P < or = 0.05) in Ki-67- and cyclin D1-positive immunoreactive cells, markers of cell cycle reentry, in the distal bronchiolar epithelium. Asbestos-induced epithelial cell proliferation in myeloperoxidase-null mice at 30 days was comparable to that found at 9 days. In contrast, inflammation and epithelial cell proliferation in asbestos-exposed normal mice increased over time. These results support the hypothesis that myeloperoxidase status modulates early asbestos-induced oxidative stress, epithelial cell proliferation, and inflammation.
doi_str_mv 10.1158/0008-5472.CAN-05-1751
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Here, we show that inhaled chrysotile asbestos fibers cause increased myeloperoxidase activity in bronchoalveolar lavage fluids (BALF) and myeloperoxidase immunoreactivity in epithelial cells lining distal bronchioles and alveolar ducts, sites of initial lung deposition of asbestos fibers. In comparison with sham mice, asbestos-exposed myeloperoxidase-null (MPO-/-) and normal (MPO+/+) mice exhibited comparable increases in polymorphonuclear leukocytes, predominately neutrophils, in BALF after 9 days of asbestos inhalation. Differential cell counts on BALF revealed decreased proportions of macrophages and increased lymphocytes in all mice exposed to asbestos, but numbers were decreased overall in asbestos-exposed myeloperoxidase-null versus normal mice. Asbestos-associated lung inflammation in myeloperoxidase-null mice was reduced (P &lt; or = 0.05) in comparison with normal asbestos-exposed mice at 9 days. 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source MEDLINE; American Association for Cancer Research Journals; EZB Electronic Journals Library
subjects Animals
Asbestos - toxicity
Biological and medical sciences
Bronchoalveolar Lavage Fluid
Carcinogenesis, carcinogens and anticarcinogens
Cell Growth Processes - drug effects
Cell Growth Processes - physiology
Chemical agents
Chemical and industrial products toxicology. Toxic occupational diseases
Cyclin D1 - metabolism
Epithelial Cells - cytology
Epithelial Cells - drug effects
Epithelial Cells - enzymology
Inhalation Exposure
Male
Medical sciences
Metals and various inorganic compounds
Mice
Mice, Inbred C57BL
Peroxidase - deficiency
Peroxidase - metabolism
Pneumonia - chemically induced
Pneumonia - enzymology
Toxicology
Tumors
title Asbestos-induced lung inflammation and epithelial cell proliferation are altered in myeloperoxidase-null mice
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