miR-204通过靶向Sirt1/p53信号通路抑制霍奇金淋巴瘤细胞增殖

目的:探讨微小RNA-204(miR-204)对霍奇金淋巴瘤细胞增殖的作用,并研究其初步机制。方法:采用RT-qPCR检测霍奇金淋巴瘤组织中miR-204和Sirt1 mRNA的表达水平。在L428细胞中分别转染miR-204模拟物(miR-204 mimic)、 Sirt1 小干扰RNA( Sirt1 siRNA)和miR-204 mimic+pcDNA3.1-Sirt1后,CCK-8法与BrdU实验分别检测细胞活力和BrdU掺入量;Western blot检测Sirt1和乙酰化p53(acetylated p53, ac-p53)的表达水平。双萤光素酶报告基因法验证miR-204与Sirt1的靶向关系。结果:霍奇金淋巴瘤组织中miR-204低表达,Sirt1 mRNA高表达。与对照组相比,L428细胞转染miR-204 mimic或 Sirt1 siRNA后,细胞活力、BrdU掺入量及Sirt1和ac-p53表达水平均显著降低( P <0.05)。与单纯miR-204 mimic转染组相比,miR-204 mimic+pcDNA3.1-Sirt1共转染组L428细胞活力、BrdU掺入量Sirt1和ac-p53蛋白表达水平均显著升高( P <0.05)。双萤光素酶报告基因实验结果表明,Sirt1 是miR-204的靶基因。结论: miR-204对L428细胞增殖的抑制作用可能是通过抑制Sirt1表达和促进ac-p53上调来实现的。

miR-204 inhibits proliferation of Hodgkin lymphoma cells by targeting Sirt1/p53 signaling pathway

AIM: To investigate the effect of microRNA-204 (miR-204) on the proliferation of Hodgkin lymphoma cells and the underlying mechanism. METHODS: The expression of miR-204 and Sirt1 mRNA in Hodgkin lymphoma tissues was detected by RT-qPCR. After transfection with miR-204 mimic, Sirt1 siRNA and miR-204 mimic+ pcDNA3.1 -Sirt1 into the L428 cells, the cell viability and BrdU incorporation were measured by CCK-8 assay and BrdU assay, respectively. The protein levels of Sirt1 and acetylated p53 (ac-p53) were determined by Western blot.The targeting relationship between miR-204 and Sirt1 was verified by double luciferase reporter assay. RESULTS: The low expression of miR-204 and the high mRNA expression of Sirt1 were found in the Hodgkin lymphoma tissues. Compared with control group, the cell viability , BrdU incorporation and the protein levels of Sirt1 and ac-p53 were significantly decreased after L428 cells were transfected with miR-204 mimic or Sirt1 siRNA ( P <0.05). Compared with miR-204 mimic alone group, the cell viability, BrdU incorporation and the protein levels of Sirt1 and ac-p53 were increased after L428 cells were co-transfected with miR-204 mimic and pcDNA3.1-Sirt1 ( P <0.05). The results of double luciferase reporter assay confiermed that Sirt1 was the target gene of miR-204. CONCLUSION: The inhibitory effect of miR-204 on the proliferation of L428 cells may be achieved by inhibiting the expression of Sirt1 and promoting the up-regulation of ac-p53.