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J Chemother. 2013 Aug;25(4):229-38. doi: 10.1179/1973947813Y.0000000092. Epub 2013 May 7.

miR-381, a novel intrinsic WEE1 inhibitor, sensitizes renal cancer cells to 5-FU by up-regulation of Cdc2 activities in 786-O.

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  • 1Department of Urology, Third Xiang-Ya Hospital of Central South University, Changsha 410000, China.



Few researches on increase of chemotherapy sensitivity by microRNA (miRNA) were reported. We aim to investigate exact role of miR-381 in chemotherapy sensitivity of 5-fluorouracil (5-FU) in renal cancer cells.


We investigated the cell survival, cell-cycle and apoptosis of 786-O and HK-2 cells treated with miR-381 and 5-FU. IC50 of 5-FU was calculated. To study apoptosis and G2/M arrest, we determined pHH3, mitotic index and caspase-3/7 activity.


We showed that miR-381 combined with 5-FU inhibited proliferation and potentiated the anti-tumour efficacies of 5-FU at tolerated concentration in vitro. miR-381 combined with 5-FU led to Cdc2 activation, mitotic catastrophe, and cell apoptosis through inhibitory WEE1. WEE1 was also validated as the direct target of miR-381. IC50 of 5-FU decreased significantly in the presence of miR-381.


miR-381 increases sensitivity of 786-O cells to 5-FU by inhibitory WEE1 and increase of Cdc2 activity.

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