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Downregulation of NDRG1 promotes invasion of human gastric cancer AGS cells through MMP-2

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Tumor Biology

Abstract

The N-myc downstream-regulated gene-1 (NDRG1) has recently been proposed as a metastasis suppressor, but its precise role remains unclear. To investigate whether NDRG1 can indeed influence the metastasis progress, expression of endogenous NDRG1 was knocked down in human AGS gastric adenocarcinoma cells using RNA interference. Stable NDRG1 “silenced” transfectants showed similar growth rates as their control counterparts. By contrast, invasive ability in Matrigel invasion activity and Gelatinolytic activity by matrix metalloproteinase-2 (MMP-2) were markedly increased in NDRG1 “silenced” cells. Moreover, re-expression of NDRG1 by recombinant adenovirus Ad-NDRG1 in NDRG1 “silenced” cells inhibited the increased invasive ability. Further study, we found the induction of MMP-2 by downregulation of NDRG1 was mediated by MT1-MMP. Altogether, our results imply that NDRG-1 could play a key role in the regulation of cellular invasion and metastasis, which may involve the upregulation of matrix metalloproteinases.

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Acknowledgments

This study was supported by the grants NSFC (Natural Science Foundation of China) no. 30670100 and also partially supported by the grants Scientific Research Plan funded by Shaanxi Provincial Department of Education no.07JK371. The authors deeply thank Dr. Costa M (Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, NY) for providing the NDRG1 cDNA expression plasmid. We thank the anonymous reviewers for their insightful comments.

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Correspondence to Zhi-kai Xu or Fang-lin Zhang.

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Yan-li Liu and Wen-tao Bai contributed equally to this work.

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Liu, Yl., Bai, Wt., Luo, W. et al. Downregulation of NDRG1 promotes invasion of human gastric cancer AGS cells through MMP-2. Tumor Biol. 32, 99–105 (2011). https://doi.org/10.1007/s13277-010-0103-z

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  • DOI: https://doi.org/10.1007/s13277-010-0103-z

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