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http://dx.doi.org/10.14348/molcells.2014.0232

NDRG2 Controls COX-2/PGE2-Mediated Breast Cancer Cell Migration and Invasion  

Kim, Myung-Jin (Department of Biological Science and the Research Center for Women's Disease, Sookmyung Women's University)
Kim, Hak-Su (Department of Biological Science and the Research Center for Women's Disease, Sookmyung Women's University)
Lee, Soo-Hwan (Department of Physiology, Ajou University School of Medicine)
Yang, Young (Department of Biological Science and the Research Center for Women's Disease, Sookmyung Women's University)
Lee, Myeong-Sok (Department of Biological Science and the Research Center for Women's Disease, Sookmyung Women's University)
Lim, Jong-Seok (Department of Biological Science and the Research Center for Women's Disease, Sookmyung Women's University)
Abstract
N-myc downstream-regulated gene 2 (NDRG2), which is known to have tumor suppressor functions, is frequently down-regulated in breast cancers and potentially involved in preventing the migration and invasion of malignant tumor cells. In the present study, we examined the inhibitory effects of NDRG2 overexpression, specifically focusing on the role of cyclooxygenase-2 (COX-2) in the migration of breast cancer cells. NDRG2 overexpression in MDA-MB-231 cells inhibited the expression of the COX-2 mRNA and protein, the transcriptional activity of COX-2, and prostaglandin $E_2$ ($PGE_2$) production, which were induced by a treatment with phorbol-12-myristate-13-acetate (PMA). Nuclear transcription factor-${\kappa}B$ (NF-${\kappa}B$) signaling attenuated by NDRG2 expression resulted in a decrease in PMA-induced COX-2 expression. Interestingly, the inhibition of COX-2 strongly suppressed PMA-stimulated migration and invasion in MDA-MB-231-NDRG2 cells. Moreover, siRNA-mediated knockdown of NDRG2 in MCF7 cells increased the COX-2 mRNA and protein expression levels and the PMA-induced COX-2 expression levels. Consistent with these results, the migration and invasion of MCF7 cells treated with NDRG2 siRNA were significantly enhanced following treatment with PMA. Taken together, our data show that the inhibition of NF-${\kappa}B$ signaling by NDRG2 expression is able to suppress cell migration and invasion through the down-regulation of COX-2 expression.
Keywords
breast cancer; COX-2; invasion; migration; NDRG2; NF-${\kappa}B$;
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