miR-9-5p靶向TIMP2诱导多发性骨髓瘤细胞自噬和凋亡的机制  

miR-9-5p-induced autophagy and apoptosis in multiple myeloma cells by targeting TIMP2

作　　者：方杰 黄芮 郑红慧 贾倩倩 鲍静[2] FANG Jie;HUANG Rui;ZHENG Honghui;JIA Qianqian;BAO Jing(Department of Hematology,Hefei Cancer Hospital,Chinese Academy of Sciences,Hefei 230031,China;Department of Hematology,the First Affiliated Hospital of Anhui Medical University)

机构地区：[1]中国科学院合肥肿瘤医院血液科,230031 [2]安徽医科大学第一附属医院血液内科

出　　处：《天津医药》2024年第8期785-790,共6页Tianjin Medical Journal

基　　金：安徽省自然科学基金资助项目(2008085MH296);安徽省教育厅自然科学研究项目(2022AH051178)。

摘　　要：目的探究miR-9-5p和组织金属蛋白酶抑制因子2(TIMP2)相互作用对多发性骨髓瘤(MM)细胞自噬和凋亡的影响机制。方法采用实时荧光定量PCR(qRT-PCR)检测初诊MM和复发MM各9例患者骨髓样本中miR-9-5p和TIMP2的表达水平,分析两者表达水平的相关性。U266细胞分为miR-对照组、miR-9-5p组、pcDNA3.1组、pcDNA3.1-TIMP2组、miR-9-5p+pcDNA3.1组、miR-9-5p+pcDNA3.1-TIMP2组。采用流式细胞术、免疫荧光染色、蛋白质印迹实验检测过表达miR-9-5p和TIMP2对U266细胞自噬和凋亡的影响;双萤光素酶报告实验验证miR-9-5p和TIMP2的靶向关系。结果与初诊MM患者相比,复发MM患者miR-9-5p表达水平升高,TIMP2表达降低;miR-9-5p和TIMP2表达水平呈负相关(P<0.05)。与miR-对照组相比,miR-9-5p组MAP1LC3B-Ⅱ的表达水平降低,MAP1LC3B-Ⅰ和SQSTM1的表达水平增加,细胞凋亡率降低(P<0.05)。与pcDNA3.1组相比,pcDNA3.1-TIMP2组MAP1LC3B-Ⅱ的表达水平升高,MAP1LC3B-Ⅰ和SQSTM1的表达水平降低,细胞凋亡率增加(P<0.05)。生物信息学和双萤光素酶报告实验证实TIMP2是miR-9-5p的靶基因。结论miR-9-5p靶向TIMP2抑制MM细胞的自噬和凋亡,从而促进MM的发生发展。Objective To investigate the mechanism of the interaction between miR-9-5p and tissue metalloproteinase inhibitor 2(TIMP2)on autophagy and apoptosis in multiple myeloma(MM)cells.Methods Real-time fluorescence quantitative PCR(qRT-PCR)was used to detect expression levels of miR-9-5p and TIMP2 in bone marrow samples of 9 patients with newly diagnosed MM and 9 patients with recurrent MM.The correlation of expression levels between the two were analyzed.U266 cells were divided into the miR-control group,the miR-9-5p group,the pcDNA3.1 group,the pcDNA3.1-TIMP2 group,the miR-9-5p+pcDNA3.1 group,and the miR-9-5p+pcDNA3.1-TIMP2 group.The effects of overexpressed miR-9-5p and TIMP2 on autophagy and apoptosis in U266 cells were detected by flow cytometry,immunofluorescence staining and Western blot experiments.The dual luciferase report experiment verified the interaction between miR-9-5p and TIMP2.Results Compared with newly diagnosed MM patients,the expression level of miR-9-5p was increased and the expression level of TIMP2 was decreased in patients with recurrent MM.The expression levels of miR-9-5p and TIMP2 were negatively correlated(P<0.05).Compared with the miR-control group,the miR-9-5p group showed a decrease in the expression level of MAP1LC3B-Ⅱ,an increase in expression levels of MAP1LC3B-Ⅰand SQSTM1,and a decrease in cell apoptosis rate(P<0.05).Compared with the pcDNA3.1 group,the expression level of MAP1LC3B-Ⅱwas increased in the pcDNA3.1-TIMP2 group,while the expression levels of MAP1LC3B-Ⅰand SQSTM1 were decreased,and the apoptosis rate of cells increased(P<0.05).Bioinformatics and dual luciferase reporter experiments confirmed that TIMP2 was the target gene of miR-9-5p.Conclusion miR-9-5p inhibits autophagy and apoptosis in MM cells by targeting TIMP2,thereby promoting the occurrence and development of MM.

关 键 词：多发性骨髓瘤 自噬 细胞凋亡 金属蛋白酶2组织抑制剂 miR-9-5p 

分 类 号：R733.3[医药卫生—肿瘤]