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- W2052510139 abstract "An elongated endothelial cell phenotype, which demonstrated increased ICAM-1-dependent neutrophil adherence, was induced when these cells were exposed to noncytotoxic concentrations of asbestos (Treadwellet al., Toxicol. Appl. Pharmacol.139, 62–70, 1996). The present study examined mechanisms underlying this phenotypic change by investigating the effects of asbestos on transcription factor activation and expression of urokinase-type plasminogen activator (uPA) and its receptor uPAR.In situzymography was used to compare the effects of these fibers on the activity of uPA. Cultures incubated with chrysotile or crocidolite asbestos, but not refractory ceramic fiber 1 (RCF-1), demonstrate localized cleavage of plasminogen, which was inhibited by amiloride. Immunocytochemistry showed that chrysotile-stimulated uPA activity was associated with a time-dependent augmentation of uPAR protein levels. RT–PCR analysis was used to investigate molecular mechanisms for these increases. Chrysotile asbestos, but not RCF-1, increased endothelial cell uPA message, relative to changes in β-actin mRNA. This response to asbestos was not limited to endothelial cells, since both uPA and uPAR mRNA levels increase in human bronchial epithelial BEAS-2B cells exposed to chrysotile fibers. Finally, both types of asbestos, but not RCF-1, increased nuclear levels of nuclear factor-kappaB (NF-κB), a transcription factor common to increased expression of ICAM-1 and uPA. These data demonstrate that asbestos caused fiber-specific activation of endothelial and pulmonary epithelial cells, resulting in phenotypes capable of facilitating tissue remodeling." @default.
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- W2052510139 date "1998-10-01" @default.
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- W2052510139 title "Expression and Activity of Urokinase and Its Receptor in Endothelial and Pulmonary Epithelial Cells Exposed to Asbestos" @default.
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- W2052510139 doi "https://doi.org/10.1006/taap.1998.8462" @default.
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