急性B淋巴细胞白血病BCL-2抑制剂耐药细胞系的构建及耐药机制研究  

Establishment of BCL-2 Inhibitors-Resistant B-cell Acute Lymphoblastic Leukemia Cell Lines and Study on Their Resistance Mechanisms

作　　者：吴沂璇 段永娟 蔡玉丽 魏璇 张英驰 章婧嫽 竺晓凡 WU Yi-Xuan;DUAN Yong-Juan;CAI Yu-Li;WEI Xuan;ZHANG Ying-Chi;ZHANG Jing-Liao;ZHU Xiao-Fan(Institute of Hematology&Blood Diseases Hospital,Chinese Academy of Medical Sciences&Peking Union Medical College,State Key Laboratory of Experimental Hematology,National Clinical Research Center for Blood Diseases,Haihe Laboratory of Cell Ecosystem,Tianjin 300020,China;Tianjin Institute of Health Science,Tianjin 301600,China)

机构地区：[1]中国医学科学院血液病医院(中国医学科学院血液学研究所),北京协和医学院血液病医院(北京协和医学院血液学研究所),实验血液学国家重点实验室,国家血液系统疾病临床医学研究中心,细胞生态海河实验室,天津300020 [2]天津医学健康研究院,天津301600

出　　处：《中国实验血液学杂志》2024年第5期1305-1312,共8页Journal of Experimental Hematology

基　　金：国家重点研发计划(2019YFA0110803);国家自然科学基金面上项目(81900135,82270189,81890992);中国医学科学院中央级公益性科研院所基本科研项目(2018RC310019);中国医学科学院临床与转化医学研究专项(2022-I2M-C&T-B-088)。

摘　　要：目的:利用急性B淋巴细胞白血病(B-ALL)细胞系RS4;11构建对BCL-2抑制剂耐药的耐药细胞系,并探讨其可能的耐药机制。方法:采用BCL-2抑制剂navitoclax和venetoclax小剂量低浓度递增的方法间歇诱导RS4;11细胞系,构建RS4;11/Nav和RS4;11/Ven耐药细胞系,通过MTT法检测不同药物浓度下细胞的存活率,流式细胞术检测细胞凋亡,转录组测序技术(RNA-seq)检测RS4;11耐药细胞系和亲本细胞系中的差异表达基因(DEGs),RRT-PCR检测耐药细胞系与亲本细胞系中差异表达基因的mRNA表达水平,Western blot检测耐药细胞系和亲本细胞系中BCL-2家族抗凋亡蛋白的表达水平。结果:成功构建了对BCL-2抑制剂耐药的耐药细胞系RS4;11/Nav和RS4;11/Ven,RS4;11/Nav对navitoclax的耐药指数为328.655±47.377,RS4;11/Ven对venetoclax的耐药指数为2 894.027±300.311。流式细胞术检测细胞凋亡发现,相比耐药细胞系,RS4;11亲本细胞系明显被BCL-2抑制剂抑制,而耐药细胞系的凋亡率基本未受药物的影响。Western blot检测结果表明,BCL-2家族抗凋亡蛋白在耐药细胞系中的表达无明显增多。RNA-seq、RT-PCR和Western blot检测发现EP300在耐药细胞系中的表达较亲本细胞系明显增高(P<0.05)。结论:小剂量低浓度递增间歇诱导法可成功构建对BCL-2抑制剂耐药的B-ALL细胞系,并且其耐药机制可能与EP300的表达上调有关。Objective:RS4;11 cell line was used to establish BCL-2 inhibitor-resistant cell lines of B-cell acute lymphoblastic leukemia(B-ALL)and explore the possible mechanisms of drug resistance.Methods:RS4;11 cell line was continuously induced and cultured by low and ascending concentrations of BCL-2 inhibitors navitoclax and venetoclax to construct navitoclax-resistant cell line RS4;11/Nav and venetoclax-resistant cell line RS4;11/Ven.The cell viability was detected by MTT assay,and the cell apoptosis was detected by flow cytometry.Differentially expressed genes(DEGs)between RS4;11 drug-resistant cell lines and parental cell line were detected by transcriptome sequencing technology(RNA-seq),and mRNA expression levels of DEGs between drug-resistant cell lines and parental cell line were detected by real-time PCR(RT-PCR).Western blot was used to detect the expression levels of BCL-2 family anti-apoptotic proteins in drug-resistant cell lines and parental cell line.Results:The drug-resistant cell lines RS4;11/Nav and RS4;11/Ven were successfully established.The resistance index(RI)of RS4;11/Nav to navitoclax and RS4;11/Ven to venetoclax was 328.655±47.377 and 2894.027±300.311,respectively.The results of cell apoptosis detection showed that compared with the drug-resistant cell lines,RS4;11 parental cell line were significantly inhibited by BCL-2 inhibitors,while the apoptosis rate of drug-resistant cell lines was not affected by the drugs.Western blot assay showed that the expression of anti-apoptotic proteins of BCL-2 family did not increase significantly in drug-resistant cell lines.RNA-seq,RT-PCR and Western blot assays showed that the expression of EP300 in drug-resistant cell lines was significantly higher than that in parental cell line(P<0.05).Conclusion:Drug-resistant B-ALL cell lines could be successfully established by exposing RS4;11 cell line to the ascending concentration of BCL-2 inhibitors,and the drug resistance mechanism may be related to the overexpression of EP300.

关 键 词：急性B淋巴细胞白血病 BCL-2抑制剂 耐药细胞系 RNA-SEQ EP300 

分 类 号：R733.71[医药卫生—肿瘤]