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miR-200bc/429 cluster targets PLCγ1 and differentially regulates proliferation and EGF-driven invasion than miR-200a/141 in breast cancer

Oncogene volume 29, pages 4297–4306 (2010)Cite this article

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Abstract

The genes encoding microRNAs of the human miR-200 family map to fragile chromosomal regions and are frequently downregulated upon tumor progression. Although having been reported to regulate epithelial-to-mesenchymal transition and transforming growth factor-beta-driven cell invasion, the role of the miR-200 family in EGF-driven breast cancer cell invasion, viability, apoptosis and cell cycle progression is still unknown. In particular, there is no study comparing the roles of the two clusters of this miRNA family. In this study, we show for the first time that miR-200 family members differentially regulate EGF-driven invasion, viability, apoptosis and cell cycle progression of breast cancer cells. We showed that, all miR-200 family members regulate EGF-driven invasion, with the miR-200bc/429 cluster showing stronger effects than the miR-200a/141 cluster. Furthermore, expression of the miR-200a/141 cluster results in G1 arrest supported by increased p27/Kip1 and decreased cyclin dependent kinase 6 expression. In contrast, expression of the 200bc/429 cluster decreases G1 population and increases G2/M phase, in line with the observed reduction of p27/Kip1 and upregulation of the inhibitory phosphorylation of Cdc25C, respectively. To test the hypothesis that phenotypical differences observed between the two clusters are caused by differential targeting spectrums, we performed genome-wide microarray profiling in combination with gain-of-function studies. This identified phospholipase C gamma 1 (PLCG1), which was downregulated only by the miR-200bc/429 cluster, as a potential candidate contributing to these phenotypical differences. Luciferase reporter assays validated PLCG1 as a direct functional target of miR-200bc/429 cluster, but not of miR-200a/141 cluster. Finally, loss of PLCG1 in part mimicked the effect of miR-200bc/429 overexpression in viability, apoptosis and EGF-driven cell invasion of breast cancer cells. Our results suggest that the miR-200 family has a tumor-suppressor function by negatively regulating EGF-driven cell invasion, viability and cell cycle progression in breast cancer.

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Acknowledgements

This work was supported in part by the National Genome Research Network (Contract No. 01GS0864) of the Federal Ministry of Education and Research (BMBF) and by Wilhelm-Sander Stiftung (Contract No. 2009.051.1). JDZ is supported by the DKFZ International PhD Program. We thank Moritz Küblbeck, Christian Schmidt and Ute Ernst for their excellent technical assistance.

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  1. S Uhlmann and J D Zhang: These authors contributed equally to this work.

Authors and Affiliations

  1. Division of Molecular Genome Analysis, German Cancer Research Center, Heidelberg, Germany

    S Uhlmann, J D Zhang, A Schwäger, H Mannsperger, S Burmester, A Ward, U Korf, S Wiemann & Ö Sahin

  2. Division of Functional Genome Analysis, German Cancer Research Center, Heidelberg, Germany

    Y Riazalhosseini

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  1. S Uhlmann
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Correspondence to Ö Sahin.

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Uhlmann, S., Zhang, J., Schwäger, A. et al. miR-200bc/429 cluster targets PLCγ1 and differentially regulates proliferation and EGF-driven invasion than miR-200a/141 in breast cancer. Oncogene 29, 4297–4306 (2010). https://doi.org/10.1038/onc.2010.201

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