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DNA methylation-mediated repression of miR-181a/135a/302c expression promotes the microsatellite-unstable colorectal cancer development and 5-FU resistance via targeting PLAG1.

J Genet Genomics. 2018 Apr 20;45(4):205-214. Epub 2018 Apr 13
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摘要


Microsatellite instability (MSI) defines a subtype of colorectal cancer (CRC) with typical clinicopathologic characteristics. CRCs with MSI (MSI CRCs) frequently acquire accelerated carcinogenesis and 5-FU resistance, and the exact underlying mechanism remains incompletely understood. Our previous study has identified the microRNA (miRNA) expression profile in MSI CRCs. In this study, three miRNAs (miR-181a, miR-135a and miR-302c) were validated by qRT-PCR to be dramatically decreased in 67 CRC samples. Proliferation and apoptosis assays demonstrated that miR-181a/135a/302c function as tumor suppressors via repressing PLAG1/IGF2 signaling. Moreover, we presented compelling evidence that restoration of miR-181a/135a/302c expression promoted sensitivity of MSI CRC cells to 5-FU treatment. miR-181a/135a/302c exerted their effect on chemoresistance through attenuating PLAG1 expression. Notably, the hypermethylation status of MSI CRC accounts for the decrements of miR-181a/135a/302c. Our results contribute to a better understanding of the mechanism of chemoresistance in MSI CRCs, and provide a clue for digging the biomarkers and therapeutic targets for CRC patients.

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