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Oncogene. 2014 Jun 19;33(25):3267-76. doi: 10.1038/onc.2013.297. Epub 2013 Jul 29.

miR-508-5p regulates multidrug resistance of gastric cancer by targeting ABCB1 and ZNRD1.

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State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, the Fourth Military Medical University, Xi'an, China.
Department of General Surgery, General Hospital of Jinan Military Command, Jinan, China.


Multidrug resistance (MDR) is usually correlated with the poor prognosis of gastric cancer. In this study, we revealed a total of 11 microRNAs (miRNA) that regulated MDR of gastric cancer via high-throughput functional screening, and miR-508-5p reversed MDR most efficiently among these candidate miRNAs. The overexpression of miR-508-5p was sufficient to reverse cancer cell resistance to multiple chemotherapeutics in vitro and sensitize tumours to chemotherapy in vivo. Further studies showed that miR-508-5p could directly target the 3'-untranslated regions of ABCB1 and Zinc ribbon domain-containing 1 (ZNRD1), and suppress their expression at the mRNA and protein levels. Meanwhile, the suppression of ZNRD1 led to a decrease in ABCB1. These findings suggest that a miR-508-5p/ZNRD1/ABCB1 regulatory loop has a critical role in MDR in gastric cancer. In addition, miR-508-5p could be used as a prognostic factor for overall survival in gastric cancer. These data reveal an important role for miR-508-5p in the regulation of MDR in gastric cancer, and suggest the potential application of miR-508-5p in drug resistance prediction and treatment.

[Indexed for MEDLINE]

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