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19 February 2019 : Laboratory Research  

MiR-34b-3p Represses the Multidrug-Chemoresistance of Bladder Cancer Cells by Regulating the CCND2 and P2RY1 Genes

Yiao Tan1234BCD, Tengyue Zhang5CD, Linyu Zhou6BD, Shuhan Liu4B, Chaozhao Liang123ADEG*

DOI: 10.12659/MSM.913746

Med Sci Monit 2019; 25:1323-1335

Abstract

BACKGROUND: Chemoresistance is a main limitation in chemotherapy for therapeutic cancer. MicroRNA (miRNA) has been indicated in the progression and tumorigenesis of many types of cancer, but the effect of miR-34b-3p in bladder cancer (BCa) cells is still unknown.

MATERIAL AND METHODS: This research compared the multidrug-sensitive (5637) BCa cell line and the multidrug-resistant (EJ) BCa cell line. We found that CCND2 (G1/S-specific cyclin-D2) and P2RY1 (purinergic receptor P2Y1) were the targets of miR-34b-3p, as further validated by qRT-PCR (quantitative real-time polymerase chain reaction) and western blot analysis.

RESULTS: Forced reversal of the levels of miR-34b-3p or CCND2/P2RY1 changed the chemoresistance profiles in both 5637 cells and EJ cells. Further experiments suggested that the CCND2 gene and the P2RY1 gene act in concert to negatively correlate with miR-34b-3p effect on BCa multidrug-chemoresistance.

CONCLUSIONS: These results not only reveal new players regulating BCa chemoresistance, but also provide clues for effective chemotherapy for BCa patients.

Keywords: Drug Resistance, Cyclin D2, Drug Resistance, Multiple, Real-Time Polymerase Chain Reaction, Receptors, Purinergic P2Y1

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750