miR-31-5p在急性髓系白血病中的表达下调

目的探讨miR-31-5p在急性髓系白血病中的表达变化,及其对白血病细胞功能的影响。方法用real-time PCR方法检测miR-31-5p在白血病患者及正常人外周血单个核细胞中的表达;用miR-31-5p模拟物转染人急性髓系白血病细胞系THP-1细胞,通过CCK-8试验和流式细胞术检测细胞增殖和单核系分化;用荧光报告基因和Western blot方法检测靶基因HuR的表达;用RNAi方法干扰内源性HuR的表达,并检测THP-1细胞的增殖和单核系分化。结果 miR-31-5p在急性髓系白血病患者外周血单个核细胞中的表达显著低于正常对照(P0.05);在THP-1细胞中过表达miR-31-5p可以抑制细胞增殖,并促进细胞向单核方向分化成熟;HuR为miR-31-5p的靶基因;干扰THP-1内源的HuR表达也会对THP-1的增殖和单核分化产生调控作用。结论 miR-31-5p在急性髓系白血病发生中可通过靶向抑制HuR发挥抑癌基因功能。

Down-regulation of miR-31-5p in human acute myeloid leukemia

Objective To study the expression and roles of miR-31-5p in acute myeloid leukemia (AML).Methods miR-31-5p in AML patients were evaluated by real-time PCR;THP-1 cells were transfected with the miR-31-5p mimic and control, respectively.The effects of over-expression of miR-31-5p were examined by CCK-8 and FACS analysis;Dual-luciferase and Western blot were performed to detect target gene HuR expression.The effects of knock-down of HUR were also examined by CCK-8 and FACS analysis.Results miR-31-5p was down-regulated in AML patients compared to the normal control.Over-expression of miR-31-5p in THP-1 cells reduces cell proliferation and accelerates monocytic differentiation.miR-31-5p could target HuR, and knock-down of HuR inhibits cell proliferation and attenuates monocytic differentiation in THP-1 cells.Conclusions miR-31-5p may regulate AML cell proliferation and monocytic differentiation by targeting HuR.