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http://dx.doi.org/10.5352/JLS.2011.21.2.286

Role of FAK Phosphorylation in Cobalt Chloride-Induced Epithelial-to-Mesenchymal-Like Transition  

Nam, Ju-Ock (Department of Ecological Environment Conservation, Kyungpook National University)
Publication Information
Journal of Life Science / v.21, no.2, 2011 , pp. 286-291 More about this Journal
Abstract
Hypoxia is a common condition found in a wide range of solid tumors and is often associated with metastasis and poor clinical outcomes. In the present study, we found that HIF-$1{\alpha}$ was induced by cobalt chloride (500 ${\mu}M$) treatment on human lung cancer cells, A549 and H460, for 24 hr. However, cobalt chloride (500 ${\mu}M$) did not affect cell proliferation of A549 and H460 in 48 hr. Cobalt chloride (500 ${\mu}M$) additionally induced epithelial-to-mesenchymal-like transition (EMT) such as reduced E-cadherin expression and increased ${\alpha}$-SMA expression. These results were confirmed by immunofluorecence experiment in H460 cells. E-cadherin was localized on the outer cell membrane. However, when the cells were treated with 500 ${\mu}M$ cobalt chloride for 24 hr, diffuse E-cadherin staining was observed, characteristic of a migratory mesenchymal phenotype. We also found that cobalt chloride induced integrin ${\beta}3$ expression and FAK phosphorylation in human lung cancer cells using western blotting and FACS anlaysis. Our data suggest that integrin ${\beta}3$-induced FAK phosphorylation may be developed into target molecules for blocking tumor metastasis.
Keywords
Hypoxia; epithelial-to-mesenchymal-like transition (EMT); integrin; FAK; cobalt chloride;
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