Linked Life Data

17425591

Source:http://linkedlifedata.com/resource/pubmed/id/17425591

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pubmed-article:17425591pubmed:abstractTextTumor hypoxia is associated with a malignant phenotype of cancer cells and poor patient prognosis. To investigate the role of hypoxia in tumor progression, we studied the effects of hypoxia in the A549 lung adenocarcinoma cell line. First, we showed that hypoxic treatment decreased cell-cell adhesion and induced a scattering of cancer cells. Concomitant with these morphological changes, the motility of cancer cells was increased, as demonstrated by the Boyden chamber assay. Then, we used oligonucleotide array analyses to identify the genes causally related to the hypoxia-induced motile phenotype. The results showed that the expression of approximately 100 genes was induced more than 5-fold by hypoxia. These included (among others) epidermal growth factor receptor (EGFR), as well as other well-known hypoxia-induced genes, such as vascular endothelial growth factor. Immunohistochemical analyses of primary lung adenocarcinomas confirmed the induction of EGFR in tumor cells in the vicinity of necrotic areas, a histological indicator of tumor hypoxia. Remarkably, the EGFR inhibitor AG1478 (10 microM) completely blocked the increased cell motility induced by hypoxia. Thus, the present study demonstrates the importance of the EGFR pathway in the increased motility of cancer cells that occurs in a hypoxic tumor environment.lld:pubmed
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pubmed-article:17425591pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:17425591pubmed:articleTitleHypoxia increases the motility of lung adenocarcinoma cell line A549 via activation of the epidermal growth factor receptor pathway.lld:pubmed
pubmed-article:17425591pubmed:affiliationDepartment of Human Pathology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan.lld:pubmed
pubmed-article:17425591pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17425591pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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