miR-519d在非小细胞肺癌脑转移中的作用及机制  

Role and mechanism of miR-519d in brain metastasis of non-small cell lung cancer

作　　者：苏莹[1] 马丽丽[1] 柳江[1] 韩忠诚[1] SU Ying;MA Li-li;LIU Jiang;HAN Zhong-cheng(Department of Oncology,People's Hospital of Xinjiang Uygur Autonomous Region,Urumqi Xinjiang 830000,China)

机构地区：[1]新疆维吾尔自治区人民医院肿瘤科,新疆乌鲁木齐830000

出　　处：《局解手术学杂志》2024年第11期974-979,共6页Journal of Regional Anatomy and Operative Surgery

基　　金：新疆维吾尔自治区自然科学基金(2022D01C139)。

摘　　要：目的探究miR-519d在非小细胞肺癌(NSCLC)脑转移(BM)中的作用及其机制。方法采用RT-PCR检测miR-519d在伴有BM的NSCLC患者和无BM的患者癌旁正常肺组织、NSCLC肺组织、NSCLC脑组织,人NSCLC细胞系(SK-MES-1、NCI-H226、NCIH1299和NCL-H820)、正常人支气管上皮细胞(HBECs)、人脑微血管内皮细胞(HBMECs)及正常人星形胶质细胞(NHA)中的表达。将过表达miR-519d慢病毒(OE-miR-519d-LV)或空载体慢病毒(NC-LV)转染至NSCLC细胞系NCI-H1299中,作为OE-miR-519d-LV组和NC-LV组;联合转染OE-miR-519d-LV与pcDNA3.1-HER3的细胞作为OE-miR-519d-LV+pcDNA3.1-HER3组。将OE-miR-519d-LV组和NC-LV组细胞经心脏注射至裸鼠体内,以构建伴BM的NSCLC动物模型,并按注射细胞的不同将小鼠分为Ctrl组与miR-519d组。使用生物发光成像系统观察NCI-H1299细胞在小鼠大脑中的转移情况。CCK-8法检测OE-miR-519d-LV组和NC-LV组中NCI-H1299细胞的增殖情况。采用HBMECs和NHA包被的Transwell小室,以建立体外血脑屏障(BBB)细胞模型,并检测OE-miR-519d-LV组和NC-LV组NCI-H1299细胞跨内皮细胞的迁移能力。Western blot检测各组细胞中上皮间质转化(EMT)相关蛋白MMP-2、MMP-9、E-cadherin、N-cadherin和Vimentin的表达。生物信息学技术分析miR-519d与HER3的潜在结合位点,双荧光素酶基因报告实验验证两者的靶向调控关系。结果与癌旁正常肺组织相比,miR-519d在NSCLC肺组织和NSCLC脑组织中的表达降低(P<0.05);与NSCLC肺组织相比,NSCLC脑组织中miR-519d表达降低(P<0.05)。与HBECs相比,miR-519d在NSCLC细胞系中的表达降低(P<0.05),且miR-519d在NCI-H1299、NCI-H226和NCL-H820细胞中的表达水平低于SK-MES-1细胞(P<0.05)。与Ctrl组裸鼠相比,miR-519d组裸鼠的BM发生率更低,生存时间更长,差异有统计学意义(P<0.05)。与NC-LV组细胞相比,OE-miR-519d-LV组NCI-H1299细胞增殖活力、跨内皮细胞迁移能力及MMP-2、MMP-9、N-cadherin和Vimentin蛋白表达降低(P<0.05),而E-cadheriObjective To investigate the role and mechanism of miR-519d in brain metastasis(BM)of non-small cell lung cancer(NSCLC).Methods RT-PCR was used to detect the expression of miR-519d in normal lung tissues adjacent to cancer,NSCLC lung tissues,NSCLC brain tissues in NSCLC patients with or without BM,human NSCLC cell lines(SK-MES-1,NCI-H226,NCI-H1299,and NCL-H820),normal human bronchial epithelial cells(HBECs),human brain microvascular endothelial cells(HBMECs),and normal human astrocytes(NHA).NSCLC cell line NCI-H1299 was transfected with either miR-519d overexpression lentivirus(OE-miR-519d-LV)or empty vector lentivirus(NC-LV),and set as the OE-miR-519d-LV group and the NC-LV group;cells co-transfected with OE-miR-519d-LV and pcDNA3.1-HER3 were designated as the OE-miR-519d-LV+pcDNA3.1-HER3 group.The cells of the OE-miR-519d-LV group and the NC-LV group were injected intracardially into nude mice to establish an animal model of NSCLC with BM,and the mice were divided into the Ctrl group and the miR-519d group based on the injected cells.Bioluminescence imaging was used to observe NCI-H1299 cell metastasis in the brain of mice.The CCK-8 assay was used to determine the proliferation of NCI-H1299 cells in the OE-miR-519d-LV group and the NC-LV group.An in vitro blood-brain barrier(BBB)model was established using HBMECs and NHA-coated Transwell chambers,and the transendothelial migration ability of NCI-H1299 cells was detected.Western blot was used to detect the expression of epithelialmesenchymal transition(EMT)-related proteins of MMP-2,MMP-9,E-cadherin,N-cadherin,and Vimentin in each group.Bioinformatics analysis was used to identify the potential binding sites between miR-519d and HER3,and their targeted regulatory relationship was validated by dual-luciferase gene reporter assays.Results Compared with the normal lung tissues adjacent to cancer,miR-519d expression was reduced in the NSCLC lung tissues and NSCLC brain tissues(P<0.05);miR-519d expression was lower in NSCLC brain tissues compared with the NSCLC lung

关 键 词：非小细胞肺癌 miR-519d 人表皮生长因子受体3 脑转移 

分 类 号：R734.2[医药卫生—肿瘤]