Regulatory effects of miR-188-5p/XRCC5 on the progression of natural killer/T-cell lymphoma.

PURPOSE Natural killer/T cell lymphoma (NKTCL) is a malignant condition. The molecular pathological mechanism of NKTCL has not been well studied. In this article we tried to study the role of microRNA-188-5p (miR-188-5p) in NKTCL. METHODS The expression level of miR-188-5p and XRCC5 was examined by quantitative real-time polymerase chain reaction (qRT-PCR). Cell counting kit-8 (CCK-8) assay and colony formation assay were used to assess the ability of cell proliferation. Dual luciferase reporter assay was used to examine the down-stream target of miR-188-5p. Western blotting was utilized to determine XRCC5 expression level. RESULTS miR-188-5p was down-regulated in NKTCL. High expression of miR-188-5p accelerated cell proliferation. XRCC5 was one of the down-stream targets. Our data indicated that miR-188-5p suppressed NKTCL progression via regulating XRCC5 expression. CONCLUSIONS This research elucidated that miR-188-5p suppressed tumor progression in NKTCL by regulating XRCC5. Our data may provide more evidence in looking for novel therapeutic targets.