TY - JOUR
T1 - The interaction of asbestos and neutrophils injures cultured human pulmonary epithelial cells
T2 - Role of hydrogen peroxide
AU - Kamp, D. W.
AU - Dunne, M.
AU - Weitzman, S. A.
AU - Dunn, M. M.
PY - 1989/1/1
Y1 - 1989/1/1
N2 - Asbestos exposure causes diffuse interstitial pulmonary fibrosis. Since alveolar epithelial cell injury is hypothesized to precede the fibrotic response in asbestosis, we investigated whether asbestos, either alone or in conjunction with neutrophils (PMNs), injured cultured human pulmonary epithelial cells (HPECs). HPEC cytotoxicity was assessed with a standard 51chromium release assay after a 16-hour incubation with asbestos and PMNs. Negligible HPEC cytotoxicity was observed after incubation with either amosite asbestos (500 μg/ml) or PMNs alone in serum-free media. However, incubation with both asbestos and PMNs caused significant HPEC injury, which was asbestos dose-dependent; causing 25% ± 4% detachment and 52% ± 8% 51chromium relese with 500 μg/ml asbestos. The cytotoxic effects of asbestos plus PMNs were nearly completely attenuated with serum (20%) or catalase (100 μg/ml) but were not prevented with scavengers of superoxide anion, hydroxyl radical, or hypochlorous acid. A role for hydrogen peroxide (H2O2) in mediating HPEC injury was also suggested by the demonstration of asbestos-induced generation of H2O2 by PMNs. Furthermore, H2O2 alone (10-4mol/L) caused significant HPEC damage. Intimate contact between asbestos-activated PMNs and HPECs was a necessary requirement for PMN-medicated HPEC cytotoxicity. These data suggest that pulmonary epithelial cell injury is mediated in part by H2O2 release from asbestos-activated PMNs as well as intimate contact between the epithelial cell, PMNs, and asbestos.
AB - Asbestos exposure causes diffuse interstitial pulmonary fibrosis. Since alveolar epithelial cell injury is hypothesized to precede the fibrotic response in asbestosis, we investigated whether asbestos, either alone or in conjunction with neutrophils (PMNs), injured cultured human pulmonary epithelial cells (HPECs). HPEC cytotoxicity was assessed with a standard 51chromium release assay after a 16-hour incubation with asbestos and PMNs. Negligible HPEC cytotoxicity was observed after incubation with either amosite asbestos (500 μg/ml) or PMNs alone in serum-free media. However, incubation with both asbestos and PMNs caused significant HPEC injury, which was asbestos dose-dependent; causing 25% ± 4% detachment and 52% ± 8% 51chromium relese with 500 μg/ml asbestos. The cytotoxic effects of asbestos plus PMNs were nearly completely attenuated with serum (20%) or catalase (100 μg/ml) but were not prevented with scavengers of superoxide anion, hydroxyl radical, or hypochlorous acid. A role for hydrogen peroxide (H2O2) in mediating HPEC injury was also suggested by the demonstration of asbestos-induced generation of H2O2 by PMNs. Furthermore, H2O2 alone (10-4mol/L) caused significant HPEC damage. Intimate contact between asbestos-activated PMNs and HPECs was a necessary requirement for PMN-medicated HPEC cytotoxicity. These data suggest that pulmonary epithelial cell injury is mediated in part by H2O2 release from asbestos-activated PMNs as well as intimate contact between the epithelial cell, PMNs, and asbestos.
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M3 - Article
C2 - 2809401
AN - SCOPUS:0024363875
SN - 1931-5244
VL - 114
SP - 604
EP - 612
JO - Translational Research
JF - Translational Research
IS - 5
ER -