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

Y Shang, Z Zhang, Z Liu, B Feng, G Ren, K Li, L Zhou… - Oncogene, 2014 - nature.com
Y Shang, Z Zhang, Z Liu, B Feng, G Ren, K Li, L Zhou, Y Sun, M Li, J Zhou, Y An, K Wu…
Oncogene, 2014nature.com
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 …
Abstract
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.
nature.com
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