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miR-29b regulates migration of human breast cancer cells

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Abstract

microRNAs (miRNAs) are short non-coding RNAs that regulate gene expression by targeting mRNAs, inhibiting the expression of the associated proteins. Although a role for aberrant miRNA expression in cancer has been postulated, the pathophysiologic role and relevance of aberrantly expressed miRNAs in tumor biology has not been established. We evaluated the expression pattern of miRNAs in human breast cancer cells by qPCR, finding out an up-regulated miRNA miR-29b and studying its biological effect by migration assay. We defined a target gene PTEN by bioinformatics approach and western blot. In breast cancer cell line MDA-MB-231 cell, which migrate faster than MCF-7, we observed that miR-29b was highly over-expressed. Inhibition of miR-29b in cultured cells increased the expression of the phosphatase and tensin homolog (PTEN) tumor suppressor, promoting apoptosis, decreasing migration, and decreasing invasion. In contrast, enhanced miR-29b expression by transfection with pre-miR-29b decreased the expression of PTEN and impaired apoptosis, increasing tumor cell migration and invasion. Moreover, PTEN was shown to be a direct target of miR-29b and was also shown to contribute to the miR-29b-mediated effects on cell invasion. Modulation of miR-29b altered the role of PTEN involved in cell migration and invasion. Aberrant expression of miR-29b, which modulates PTEN expression, can contribute to migration, invasion, and anti-apoptosis.

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Acknowledgment

We thank professor Ke Zen (School of Life Science, Nanjing University) for technical and financial support.

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Authors and Affiliations

  1. School of Life Science, NJU 3 M Laboratory, Jiangsu Diabetes Research Center, Nanjing, Jiangsu, China

    Chen Wang & Zhen Bian

  2. School of Medicine, Nanjing University, Nanjing, Jiangsu, China

    Chen Wang

  3. Jiangsu Cancer Hospital, Nanjing, Jiangsu, China

    Da Wei

  4. The Second Affiliated Hospital of Harbin Medical University, Harbin, China

    Jian-guo Zhang

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  1. Chen Wang
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  2. Zhen Bian
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  3. Da Wei
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  4. Jian-guo Zhang
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Correspondence to Chen Wang.

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Wang, C., Bian, Z., Wei, D. et al. miR-29b regulates migration of human breast cancer cells. Mol Cell Biochem 352, 197–207 (2011). https://doi.org/10.1007/s11010-011-0755-z

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  • DOI: https://doi.org/10.1007/s11010-011-0755-z

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