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目的:探讨长链非编码RNA（lncRNA）C9ORF139靶向微小RNA（miR）-24-3P/TAOK1调控急性髓系白血病（AML）细胞增殖的作用和机制。方法:AML细胞株（人急性早幼粒白血病细胞株HL-60以及人单核白血病细胞株THP-1）购自中国科学院，分为4组：A组为阴性对照（siNC）组，B组为干扰C9ORF139（siC9ORF139）组，C组为siC9ORF139+miR-24-3P抑制剂组，D组为miR-24-3P+TAOK1过表达（oe-TAOK1）组。采用实时荧光定量逆转录（qRT）-PCR检测4组AML细胞株HL-60、THP-1中的表达水平。细胞计数试剂盒-8（CCK8）法检测细胞增殖，流式细胞仪分析细胞的凋亡情况，Transwell实验检测4组细胞的迁移、侵袭能力，Western印迹法检测p-丝氨酸/苏氨酸激酶（p-raf）、p-丝裂原活化蛋白激酶（p-MEK）、p-细胞外调节蛋白激酶（p-ERK）表达。构建荧光素酶报告基因质粒，验证C9ORF139、miR-24-3P、TAOK1的结合能力。裸鼠皮下肿瘤细胞接种分为HL-60（A组）和HL-60（B组）。结果:敲减细胞中C9ORF139基因并培养120 h后，在HL-60及THP-1细胞中，B组细胞增殖能力（0.62±0.02、0.82±0.02）、迁移能力（0.22±0.03、0.05±0.01）、侵袭能力（0.20±0.02、0.13±0.03）均低于A组（1.30±0.02、1.83±0.07；0.99±0.02、0.99±0.02；1.00±0.01、1.00±0.01）（均n P<0.05）。共转染miR-24-3抑制剂后，细胞增殖能力、迁移能力、侵袭能力均高于B组（均n P<0.05）。共转染miR-24-3P与oe-TAOK1质粒后，细胞增殖能力、迁移能力、侵袭能力均高于B组（均n P<0.05）。当干扰细胞中C9ORF139基因后，与A组凋亡水平（0.31±0.27、2.49±0.33）相比，B组（28.56±8.07、17.74±1.91）均较高（均n P<0.05）；当共转染miR-24-3P抑制剂后，C组细胞凋亡水平（2.34±0.09、3.06±0.06）均低于B组（均n P<0.05）；在共转染miR-24-3P与oe-TAOK1质粒组中，D组细胞凋亡水平（2.16±1.29、4.80±0.37）均低于B组（均n P<0.05）。在HL-60、THP-1细胞中，当C9ORF139未突变时，miR-24-3P组荧光素酶活性均低于miR-NC组（均n P0.05）。当TAOK1未突变时，miR-24-3P组荧光素酶活性低于miR-NC组（n P0.05）。当干扰HL-60细胞中C9ORF139基因并培养72 h后，B组Raf、MEK及ERK分子磷酸化表达水平均低于A组（均n P<0.05）。第14天，A组肿瘤体积高于B组［（284.49±57.61）比（125.70±18.64）mmn 3，n P=0.017］。HL-60 A组肿瘤重量高于B组［（847.80±159.36）比（408.40±113.16）mg，n P=0.001］。n 结论:lncRNA C9ORF139通过调控miR-24-3P上调TAOK1促进AML细胞的增殖、侵袭、迁移，C9ORF139表达具有促进AML裸鼠皮下肿瘤生长的作用。“,”Objective:To investigate the role and mechanism of long non-coding RNA (lncRNA) C9ORF139 targeting micro RNA(miR)-24-3P/TAOK1 in regulating the proliferation of acute myeloid leukemia (AML) cells.Methods:AML cells HL-60 and THP-1 were purchased from the Chinese Academy of Sciences and divided into 4 groups:group A was negative control group (siNC group), group B was interference C9ORF139 group (siC9ORF139 group), group C was siC9ORF139+miR-24-3p inhibitor group, and group D was miR-24-3P+TAOK1 overexpression group (oe-TAOK1 group). Real-time fluorescence quantitative reverse transcription PCR was used to detect the expression levels of AML cell lines of HL-60 and THP-1 in four groups. Cell Counting Kit-8 assay was performed to measure cell proliferation. Flow cytometry was applied to analyze cell apoptosis. Transwell test was applied to detect cell migration and invasion ability. Western blot was used to detect p-serine/threonine kinase (p-raf) and p-mitogen activation proteinkinase (p-MEK), p-extracellular regulatory protein kinase (p-ERK) expression. The luciferase reporter gene plasmid was constructed to verify the binding ability of C9ORF139,miR-24-3P and TAOK1.Nude mice were inoculated with subcutaneous tumor cells of HL-60 (group A) and HL-60 (group B).Results:After the C9ORF139 gene was knocked down and cultured for 120 h, The cell proliferation ability (0.62±0.02, 0.82±0.02), migration ability (0.22±0.03, 0.05±0.01), invasion ability (0.20±0.02, 0.13±0.03) of group B were all lower than that of group A (1.30±0.02, 1.83±0.07; 0.99±0.02, 0.99±0.02; 1.00±0.01, 1.00±0.01) (all n P<0.05). When co-transfected with miR-24-3 inhibitor, cell proliferation ability, migration ability and invasion ability were all higher in group B (alln P<0.05). When co-transfected with miR-24-3P and oe-TAOK1 plasmid, cell proliferation ability, migration ability and invasion ability were all higher than group B (alln P<0.05).When the C9ORF139 gene in the cells was knocked down, the apoptosis level of group B (28.56±8.07, 17.74±1.91) were higher than those of group A (0.31±0.27, 2.49±0.33)(alln P<0.05); when co-transfected with miR-24-3P inhibitor, the apoptosis level (2.34±0.09, 3.06±0.06) were lower than those in group B (alln P<0.05); when co-transfected with miR-24-3P and oe-TAOK1 in the plasmid group, the apoptosis level (2.16±1.29, 4.80±0.37) were also lower than those of group B (alln P<0.05). In HL-60 and THP-1 cells, when C9ORF139 was not mutated, the luciferase activity of miR-24-3P group was lower than that of the miR-NC group (n P0.05).When TAOK1 was not mutated; the luciferase activity of miR-24-3P group was lower than that of group A (n P0.05).When the C9ORF139 gene in HL-60 cells was knocked down and cultured for 72 h, the phosphorylation expression levels of Raf, MEK and ERK molecules in group B were significantly lower than those in group A (all n P<0.05). By day 14, the tumor volume in the group A was greater than the tumor cell volume in the group B [(284.49±57.61) vs (125.70±18.64) mmn 3, n P=0.017]. The tumor weight of HL-60 in group A was heavier than that of group B [(847.80±159.36) vs (408.40±113.16) mg, n P=0.001].n Conclusions:LncRNA C9ORF139 regulates TAOK1 by sponging miR-24-3P to promote the proliferation, invasion and migration of acute myeloid leukemiacell.In vivo experiments have confirmed that the expression of C9ORF139 can promote the growth of subcutaneous tumors in AML nude mice.