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Regulation of Axl receptor tyrosine kinase expression by miR-34a and miR-199a/b in solid cancer

Abstract

Axl is a receptor that induces proliferation, migration and invasion in cancer. In this study, we show that specific microRNAs (miRNAs) target the 3′-UTR of Axl. Luciferase-reporter assays with wild-type and deleted miR-34 and miR-199a/b seed sequences of Axl 3′-UTR confirmed the specificity of targeting. An inverse correlation between Axl protein and miR-34a expression in a panel of non-small cell lung cancer (NSCLC), colorectal cancer (CRC) and breast cancer (BRC) cell lines was observed, while miR-199a/b expression was completely suppressed. Pre-miR transfection inhibited in vitro migration and invasion and, in vivo, reduced the number of distant lung- or liver-metastases in a chorion-allantoic-membrane (CAM) assay. Moreover, methylation-specific PCR on bisulfite-converted DNA obtained from the cell lines showed that the miR-34a promoter methylation status was inversely correlated with its expression, and that miR-199a/b promoter regions were methylated in all cells tested. In a panel of NSCLC tissues (n=44), miR-34a and miR-199a/b were found to be downregulated and significantly co-expressed. A lower expression of all three miRs was significantly associated with squamous histotypes, and, in a preliminary series, NSCLC patients with miR-34a upregulation showed a positive association towards a longer survival. These results indicate that Axl receptor expression can be regulated by miR-34a and miR-199a/b, which are suppressed by promoter methylation in solid cancer cells.

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Acknowledgements

HA was supported by Alfried Krupp von Bohlen und Halbach Foundation, Essen, Hella-Bühler-Foundation, Heidelberg, Dr Ingrid zu Solms Foundation, Frankfurt/Main, Hector Foundation, Weinheim, Germany, FRONTIER Excellence Initiative of the University of Heidelberg, the BMBF, Bonn, Germany, and Walter Schulz Foundation, Munich, Germany. We thank Erika Hillerich and Laura Nelson for excellent help and critical appraisal of the manuscript.

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Correspondence to H Allgayer.

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Mudduluru, G., Ceppi, P., Kumarswamy, R. et al. Regulation of Axl receptor tyrosine kinase expression by miR-34a and miR-199a/b in solid cancer. Oncogene 30, 2888–2899 (2011). https://doi.org/10.1038/onc.2011.13

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