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Papers In Press, published online ahead of print April 24, 2001
J. Biol. Chem, 10.1074/jbc.C100140200
Submitted on March 23, 2001
Revised on April 23, 2001
Accepted on April 23, 2001
Department of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1690
Corresponding Author: sdubinett{at}mednet.ucla.edu
Summary Elevated tumor cyclooxygenase (COX-2) expression is associated with increased angiogenesis, tumor invasion and suppression of host immunity. We have previously shown that genetic inhibition of tumor COX-2 expression reverses the immunosuppression induced by non-small cell lung cancer (NSCLC). To assess the impact of COX-2 expression in lung cancer invasiveness, NSCLC cell lines were transduced with a retroviral vector expressing the human COX-2 cDNA in the sense (COX-2-S) and antisense (COX-2-AS) orientations. COX-2-S clones expressed significantly more COX-2 protein, produced 10 fold more PGE2 and demonstrated an enhanced invasive capacity compared to control vector-transduced or parental cells. CD44, the cell surface receptor for hyaluronate, was overexpressed in COX-2-S cells, and specific blockade of CD44 significantly decreased tumor cell invasion. In contrast, COX-2-AS clones had a very limited capacity for invasion and showed diminished expression of CD44. These findings suggest that a COX-2-mediated, CD44-dependent pathway is operative in NSCLC invasion. Because tumor COX-2 expression appears to have a multifaceted role in conferring the malignant phenotype, COX-2 may be an important target for gene or pharmacologic therapy in NSCLC.
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