Abstract
The functional impact of recently discovered miRNAs in human cancer remains to be clarified. One miRNA in colorectal cancer which has attracted attention is miR-545. In this study, we examined the function of miR-545 in proliferation of colorectal cancer cells. Expressions of HOTAIR, miRNA-545, and epidermal growth factor receptor (EGFR) mRNA were measured in 100 paired cancerous and non-cancerous tissues as well as in SW480 and LOVO colorectal cancer cell (CRC) lines by quantitative RT-PCR. The relative protein level of EGFR was measured using western blotting. Effects of miRNA-545 and HOTAIR on gastric cancer cells were studied by overexpression and RNA interference approaches. Insight of mechanism of promotion cancer by miR-545 was gained from luciferase reporter assay and gene expression analysis. CRC proliferation was evaluated using clone formation and MTT assay. Differential expressions of HOTAIR, miR-545, and EGFR were observed in cancerous tissues in comparison to non-cancerous tissues. By expressional management of miR-545, we observed that miR-545 negatively regulated cell proliferation. Also luciferase reporter assay revealed that miR-545 inhibited regulated EGFR expression by affecting its 3′-UTR activity. In addition, miR-545 expression was suppressed by HOTAIR overexpression whereas enhanced by HOTAIR silence. Suppression of EGFR expression by miR-545 mimic was abrogated by HOTAIR overexpression. Monitoring of tumor growth in mice showed that miR-545 overexpression suppressed LOVO tumor growth. Our data suggested that HOTAIR long non-coding RNA mediates microR-545 regulating colorectal cancer cells proliferation.
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This study was supported by CSCO-Merck Serono Oncology Research Fund (SCORE) (grant number Y-MX2015-094).
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Huang, X., Lu, S. MicroR-545 mediates colorectal cancer cells proliferation through up-regulating epidermal growth factor receptor expression in HOTAIR long non-coding RNA dependent. Mol Cell Biochem 431, 45–54 (2017). https://doi.org/10.1007/s11010-017-2974-4
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DOI: https://doi.org/10.1007/s11010-017-2974-4