miR-1298-5p通过靶向MSH2基因对非小细胞肺癌细胞生物学行为及肿瘤免疫微环境的影响

Effect of miR-1298-5p on biological behavior of non-small cell lung cancer cellsand tumor immune microenvironment by targeting MSH2 gene

目的:探究miR-1298-5p在非小细胞肺癌(NSCLC)中调节MSH2基因的潜在机制及对肿瘤细胞生物学行为和肿瘤免疫微环境的影响。方法:采用生物信息学手段确定NSCLC中涉及的关键基因和miRNA。采用CCK-8检测细胞增殖能力,Transwell实验检测细胞侵袭、迁移能力。ELISA检测炎症因子的水平。Western blot测定细胞内中MSH2的表达情况,荧光定量聚合酶链反应(RT-qPCR)检测NSCLC细胞中miR-1298-5p和MSH2基因表达。双荧光素酶报告基因实验验证miR-1298-5p与MSH2的靶向关系。Spearman相关性分析miR-1298-5p与肿瘤免疫微环境中免疫细胞和免疫因子的相关性。结果:与正常肺部组织细胞相比,NSCLC细胞中miR-1298-5p水平下调。miR-1298-5p过表达可抑制NSCLC细胞的增殖、迁移和侵袭。使用荧光素酶报告基因检测证实MSH2是miR-1298-5p的靶基因。此外,NSCLC细胞中miR-1298-5p的下调可通过沉默MSH2来逆转。miR-1298-5p的表达水平与Treg、IL-10和TGF-β水平呈负相关,与CD3^(+)T、CD4^(+)T、CD8^(+)T、NK细胞、IL-2和IFN-γ水平呈正相关。结论:miR-1298-5p负性调控MSH2抑制NSCLC细胞的增殖、侵袭及迁移,并改善肿瘤免疫微环境。

Objective:To investigate the potential mechanism of miR-1298-5p in non-small cell lung cancer(NSCLC)to regulate the MSH2 gene and its effect on the biological behavior of tumor cells and the tumor immune microenvironment.Methods:Bioinformatics was used to identify the key genes and miRNA involved in NSCLC.Cell proliferation was detected by CCK-8 assay,and cell invasion and migration were detected by Transwell assay.Levels of inflammatory factors were detected by ELISA assay.Western blot was used to measure the expression of MSH2 in cells,and fluorescence quantitative polymerase chain reaction(RT-qPCR)was used to detect the expressions of miR-1298-5p and MSH2 gene in NSCLC cells.Dual luciferase reporter gene assay was performed to verify the targeting relationship between miR-1298-5p and MSH2.Spearman correlation analysis was performed to correlate miR-1298-5p with immune cells and immune factors in the tumor immune microenvironment.Results:The level of miR-1298-5p was down-regulated in NSCLC cells compared with normal lung tissue cells.miR-1298-5p overexpression inhibited the proliferation,migration and invasion of NSCLC cells.MSH2 was confirmed to be a target gene of miR-1298-5p using luciferase reporter gene assay.Furthermore,downregulation of miR-1298-5p in NSCLC cells could be reversed by silencing MSH2.miR-1298-5p expression levels were negatively correlated with the levels of Treg,IL-10,and TGF-β,and positively correlated with the levels of CD3^(+)T,CD4^(+)T,CD8^(+)T,NK cells,IL-2,and IFN-γ.Conclusion:miR-1298-5p negatively regulates MSH2 to inhibit the proliferation,invasion and migration of NSCLC cells and improve the tumor immune microenvironment.