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ß1-Integrin mediates asbestos-induced phosphorylation of AKT and ERK1/2 in a rat pleural mesothelial cell line

Oncogene volume 22, pages 8524–8528 (2003)Cite this article

Abstract

Integrin-mediated signalling has been implicated in asbestos-induced carcinogenesis. In studies here, we examined signal transduction events associated with integrin-directed cell reactions triggered by crocidolite asbestos in the pleural mesothelial cell line 4/4 RM-4. Crocidolite fibres induced a significant time- and dose-dependent activation of the extracellular-signal-regulated kinases ERK1 and ERK2. ERK activation was specifically inhibited by integrin-blocking agents, that are integrin-binding peptides containing the sequence arginine-glycine-aspartic acid (RGD), and monoclonal antibodies against the integrin ß1-chain. Integrin-dependent activation of ERK1/2 in response to asbestos appeared to be independent of focal adhesion kinase pp125FAK (FAK) since FAK autophosphorylation remained unaffected in crocidolite-exposed mesothelial cells. Instead, we observed striking similarities in the kinetics of asbestos-induced ERK1/2 responses and phosphorylation of protein kinase B (AKT) at serine 473, a possible target residue for integrin-linked kinase. As with ERK activation, asbestos-induced AKT stimulation was significantly blocked by both the RGD-peptide and the ß1-integrin antibodies. These studies are the first to establish that in mesothelial cells ERK1/2 and AKT are simultaneously phosphorylated upon asbestos exposure in a ß1-integrin-dependent manner.

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Acknowledgements

This work was supported by Grant UN 110/1–1 from the Deutsche Forschungsgemeinschaft.

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  1. Department of Toxicology, Institut für umweltmedizinische Forschung (IUF) at the Heinrich-Heine-University Düsseldorf, Auf'm Hennekamp 50, Düsseldorf, 40225, Germany

    Antje Berken, Josef Abel & Klaus Unfried

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  1. Antje Berken
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  2. Josef Abel
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  3. Klaus Unfried
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Correspondence to Klaus Unfried.

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Berken, A., Abel, J. & Unfried, K. ß1-Integrin mediates asbestos-induced phosphorylation of AKT and ERK1/2 in a rat pleural mesothelial cell line. Oncogene 22, 8524–8528 (2003). https://doi.org/10.1038/sj.onc.1207195

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