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p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.

DNA damage induced by chemicals and ionizing radiation is associated with the expression of negative regulators of the cell cycle. The arrest of cells in G1 and G2 phases of the cell cycle provides time for DNA repair. Asbestos fibers are carcinogenic when inhaled by both humans and animals; however...

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Detalles Bibliográficos
Autores principales: Johnson, N F, Jaramillo, R J
Formato: Texto
Lenguaje:English
Publicado: 1997
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470160/
https://www.ncbi.nlm.nih.gov/pubmed/9400714
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author Johnson, N F
Jaramillo, R J
author_facet Johnson, N F
Jaramillo, R J
author_sort Johnson, N F
collection PubMed
description DNA damage induced by chemicals and ionizing radiation is associated with the expression of negative regulators of the cell cycle. The arrest of cells in G1 and G2 phases of the cell cycle provides time for DNA repair. Asbestos fibers are carcinogenic when inhaled by both humans and animals; however, the mechanism by which the fibers exert their effect is unknown. This work was undertaken to determine whether the expression of DNA damage-inducible genes differs between crocidolite, a fiber positive for lung tumors, and JM 100 glass microfiber, which is negative for lung tumors when inhaled by rats. Temporal and dose-related expressions of p53, Cip1, and Gadd153 proteins were determined in cultured A549 cells treated with either Union Internationale Contre le Cancer crocidolite or JM 100 for 20 hr and cultured in fresh media. Immunolabeled cells were analyzed by flow cytometry, and the increased number of protein-expressing cells was determined by subtracting the expression in unexposed cells from exposed cells. Crocidolite induced the expression of all three proteins with a maximum expression after approximately 18 hr in fresh media. At a similar time point, JM 100 did not markedly induce the three proteins. Crocidolite also induced a dose-dependent increase in the number of cells in the G2 phase of the cell cycle. These results show that asbestos behaves like ionizing radiation and genotoxic chemicals by inducing proteins associated with DNA damage and cell-cycle arrest. The clear difference in response between crocidolite and JM 100 may help elucidate the mechanism of action of toxic and nontoxic fibers.
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spelling pubmed-14701602006-06-01 p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers. Johnson, N F Jaramillo, R J Environ Health Perspect Research Article DNA damage induced by chemicals and ionizing radiation is associated with the expression of negative regulators of the cell cycle. The arrest of cells in G1 and G2 phases of the cell cycle provides time for DNA repair. Asbestos fibers are carcinogenic when inhaled by both humans and animals; however, the mechanism by which the fibers exert their effect is unknown. This work was undertaken to determine whether the expression of DNA damage-inducible genes differs between crocidolite, a fiber positive for lung tumors, and JM 100 glass microfiber, which is negative for lung tumors when inhaled by rats. Temporal and dose-related expressions of p53, Cip1, and Gadd153 proteins were determined in cultured A549 cells treated with either Union Internationale Contre le Cancer crocidolite or JM 100 for 20 hr and cultured in fresh media. Immunolabeled cells were analyzed by flow cytometry, and the increased number of protein-expressing cells was determined by subtracting the expression in unexposed cells from exposed cells. Crocidolite induced the expression of all three proteins with a maximum expression after approximately 18 hr in fresh media. At a similar time point, JM 100 did not markedly induce the three proteins. Crocidolite also induced a dose-dependent increase in the number of cells in the G2 phase of the cell cycle. These results show that asbestos behaves like ionizing radiation and genotoxic chemicals by inducing proteins associated with DNA damage and cell-cycle arrest. The clear difference in response between crocidolite and JM 100 may help elucidate the mechanism of action of toxic and nontoxic fibers. 1997-09 /pmc/articles/PMC1470160/ /pubmed/9400714 Text en
spellingShingle Research Article
Johnson, N F
Jaramillo, R J
p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title_full p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title_fullStr p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title_full_unstemmed p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title_short p53, Cip1, and Gadd153 expression following treatment of A549 cells with natural and man-made vitreous fibers.
title_sort p53, cip1, and gadd153 expression following treatment of a549 cells with natural and man-made vitreous fibers.
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470160/
https://www.ncbi.nlm.nih.gov/pubmed/9400714
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