MiR-125a-3p通过MAPK信号通路影响胶质瘤细胞的增殖及凋亡的实验研究  

Effect of micro RNA-125a-3p on proliferation and apoptosis of glioma cells via MAPK signaling pathway

作　　者：谢琳[1] 黄佐於 欧阳乐平[1] 何明亮[1] 刘家豪[1] 刘安民[1] Xie Lin;Huang Zuoyu;Ouyang Leping;He Mingliang;Liu Jiahao;Liu Anmin(Department of Neurosurgery,Sun Yat-sen Memorial Hospital,Sun Yat-sen University,Guangzhou 510120,China)

机构地区：[1]中山大学孙逸仙纪念医院神经外科,广州510120

出　　处：《中华神经医学杂志》2018年第12期1203-1209,共7页Chinese Journal of Neuromedicine

基　　金：广东省自然科学基金(2017A030313516).

摘　　要：目的 探讨miR-125a-3p对胶质瘤细胞增殖及凋亡的影响及其在丝裂原活化蛋白激酶(MAPK)信号通路中的作用.方法 (1)比较肿瘤基因组图谱(TCGA)数据库中565例胶质瘤组织和10例正常脑组织中miR-125a-3p的表达.(2)收集中山大学孙逸仙纪念医院神经外科自2015年4月至2018年4月手术切除并经病理检查证实的胶质瘤标本30例,其中低级别脑胶质瘤7例,高级别胶质瘤23例.另外收集同期因手术入路需要和颅脑外伤切除的正常脑组织标本8例.应用反转录-实时荧光定量PCR(RT-qPCR)检测脑胶质瘤组织和正常脑组织中miR-125a-3p的表达.(3)体外培养正常胶质细胞HA1800及人脑胶质瘤细胞U251、U373、U87、U138、T98G,72 h后应用RT-qPCR检测6组细胞miR-125a-3p的表达;(4)取对数生长期的U251、U373细胞,分为无义序列组和miR-125a-3p模拟物组,应用LipofectamineTM 2000分别转染无义序列和miR-125a-3p模拟物.转染后72 h应用RT-qPCR检测2组细胞miR-125a-3p的表达,克隆形成实验检测2组细胞的增殖情况,流式细胞术检测2组细胞的凋亡情况,Western blotting检测2组细胞凋亡相关蛋白和MAPK信号通路相关蛋白的表达.结果 (1)TCGA数据库中,胶质瘤组织中miR-125a-3p的表达低于正常脑组织,差异有统计学意义(P<0.05).(2)临床收集的正常脑组织、低级别胶质瘤、高级别胶质瘤标本中miR-125a-3p的表达依次降低,差异有统计学意义(P<0.05);(3)与HA1800细胞比较,U251、U373、U87、U138、T98G细胞中miR-125a-3p的表达均降低,差异有统计学意义(P<0.05),其中U251和U373细胞中miR-125a-3p表达下降得最明显.(4)与无义序列组比较,miR-125a-3p模拟物组U251和U373细胞中miR-125a-3p的表达增加,克隆形成率降低,凋亡率增加,凋亡相关蛋白活化的半胱氨酸蛋白酶(cleaved-caspase)-3、cleaved-caspase-9和cleaved-caspase-7的表达均增加,磷酸化(p)-P38/MAPK蛋白的表达增加,差异均有统计学意义(P<0.05).结论 miR-125a-3p在脑�Objective To investigate the effect of micro RNA (miR)-125a-3p on proliferation and apoptosis of glioma cells and its role in MAPK signaling pathway. Methods (1) The miR-microarray data from the Cancer Genome Atlas (TCGA, https:// cancergenome.nih.gov/) database were downloaded, and the miR-125a-3p expressions in 565 gliomas tissues and 10 normal brain tissues were compared. (2) Clinical collection of 30 glioma specimens surgically resected in our hospital from April 2015 to April 2018, was performed, including 7 of low-grade glioma and 23 of high-grade glioma;8 normal brain tissues needed craniocerebral trauma excision were collected at the same time period;reverse transcription (RT)-real-time quantitative (q) PCR was used to detect the miR-125a-3p expressions in glioma tissues and normal brain tissues. (3) The normal brain glial cells HA1800 and glioma cells (U251, U138, U87, U373, and T98G) were routinely cultured in vitro; RT-qPCR was used to detect the miR-125a-3p expression in normal brain glial cells and glioma cell lines. (4) The cultured glioma cell lines U251 and U373 at logarithmic phase were divided into miR-125a-3p group and negative control group;and miR-125a-3p mimic or nonsense sequence were transfected using LipofectamineTM 2000;72 h after transfection, the miR-125a-3p expression was detected by RT-qPCR; the proliferation rate was detected by clone formation after transfection; the apoptosis rate was detected by flow cytometry 72 h after transfection; the cleaved-caspase-3, cleaved-caspase-9, cleaved-caspase-7, P38 and P-P38/MAPK protein expressions were detected by Western blotting. Results (1) In TCGA database, the miR-125a-3p expression in glioma brain tissues was statistically lower as compared with that in normal brain tissues (P<0.05). (2) The miR-125a-3p expressions in clinically collected normal brain tissues, low-grade glioma specimens and high-grade glioma specimens were decreased successively, enjoying statistically significant differences (P<0.05). (3) As compared with normal glial ce

关 键 词：神经胶质瘤 miR-125a-3p 细胞增殖 细胞凋亡 丝裂原活化蛋白激酶 

分 类 号：R730.264[医药卫生—肿瘤]