癌变·畸变·突变 ›› 2021, Vol. 33 ›› Issue (3): 218-224.doi: 10.3969/j.issn.1004-616x.2021.03.011

• 论著 • 上一篇    下一篇

三阴性乳腺癌细胞系MDA-MB-231与其脑转移细胞系中microRNA差异表达分析

罗娇1,3, 张坤驰2,4, 周莉1,3   

  1. 1. 贵州医科大学临床医学院, 贵州 贵阳 550025;
    2. 上海健康医学院上海市分子影像学重点实验室, 上海 201318;
    3. 上海健康医学院附属周浦医院肿瘤血液科, 上海 201318;
    4. 贵州工程职业学院, 贵州 铜仁 554300
  • 收稿日期:2020-08-27 修回日期:2021-02-24 出版日期:2021-05-30 发布日期:2021-06-09
  • 通讯作者: 周莉,E-mail:lzhou_sh@hotmail.com E-mail:lzhou_sh@hotmail.com
  • 作者简介:罗娇,E-mail:l287923@163.com。
  • 基金资助:
    浦东新区学科带头人培养项目(PWRd2017-02);上海市自然科学基金面上项目(18ZR1417800);国家自然科学基金(81801833);贵州省科技计划项目(黔科合基础[2019]1129号)

Analysis of differentially expressed microRNAs between the triple negative breast cancer cell line MDA-MB-231 and its brain metastasis cell line

LUO Jiao1,3, ZHANG Kunchi2,4, ZHOU Li1,3   

  1. 1. Clinical Medicine, Guizhou Medical University, Guiyang 550025, Guizhou;
    2. Shanghai Key Laboratory for Molecular Imaging, Shanghai University of Medicine & Health Sciences, Shanghai 201318;
    3. Department of Oncology and Hematology, Shanghai University of Medicine & Health Sciences Affiliated Zhoupu Hospital, Shanghai 201318;
    4. Guizhou Engineering Vocational College, Tongren 554300, Guizhou, China
  • Received:2020-08-27 Revised:2021-02-24 Online:2021-05-30 Published:2021-06-09

摘要: 目的:分析三阴性乳腺癌(TNBC)细胞系MDA-MB-231(MB-231)与其脑转移细胞系MDA-MB-231Brm (MB-231Brm)中microRNA (miRNA)的表达差异,寻找有价值的三阴性乳腺癌脑转移相关的miRNA。方法:Trizol法提取MB-231和MB-231Brm细胞总RNA,用Illumina高通量测序技术分离并检测miRNA表达情况,将其与已知的miRNA数据库比对,采用miRDeep2软件进行新的miRNA预测;使用差异基因检测法筛选差异表达的miRNA,构建差异表达谱。应用生物信息学分析进行miRNA靶基因的功能分析,并用实时荧光定量PCR (qPCR)进行验证。结果:MB-231和MB-231Brm细胞中miRNA的种类和表达存在差异,两者共有的miRNA为961种,前者自有164种,后者自有196种;与MB-231相比,MB-231Brm细胞的miRNA中,有145个表达显著上调,54个表达显著下调,1 122个表达未见明显差异;差异表达分析显示,与MB-231相比,MB-231Brm中的miR-199a-3p和miR-103a-3p等表达显著增加,而miR-1246和miR-4787-5p等表达显著下降;基因本体分析(GO)发现差异表达的miRNA所调控的靶基因与细胞组分、分子功能及生物过程均相关;qPCR验证发现,与MB-231相比,miR-1246在MB-231Brm中表达显著降低且差异有统计学意义(P < 0.05)。结论:MB-231和MB-231Brm中存在差异表达的miRNA,且在TNBC脑转移过程中其调控的靶基因通过参与细胞组分形成、调节分子功能及调控生物过程等发挥作用;并发现miR-1246在脑转移细胞系中的表达下降,其可能通过某种途径参与TNBC脑转移的发生、发展过程。

关键词: 三阴性乳腺癌, 脑转移, 差异表达, 微小RNA, miR-1246

Abstract: OBJECTIVE: To analyze differentially expressed miRNAs between the triple negative breast cancer cell line MDA-MB-231 (MB-231) and its brain metastasis cell line MDA-MB-231Brm (MB-231Brm), and to screen biomarkers associated with the brain metastases. METHODS: The Trizol method was used to extract miRNA from MB-231 and MB-231Brm,and PCR was used to construct RNA libraries. After filtering the data and comparing to known miRNA databases,the miRDeep2 method was used to make new miRNA predictions for unknown miRNAs. Then, a differential gene detection method was used to screen the differentially expressed miRNAs. Finally,bioinformatics analysis tools was used to perform functional analysis of the target genes which could be regulated by these miRNAs. Quantitative PCR (qPCR) analyses were used to validate the microarray data. RESULTS: There were differences in the types and expressions of miRNAs between the MB-231 and the MB-231Brm cells. Briefly, 961 kinds of miRNA were shared by both, 164 species of miRNAs only existed in MB-231, and 196 species of miRNAs only existed in MB-231Brm. Compared with MB-231,145 expressions were significantly up-regulated in MB-231Brm,and 64 expressions were significantly down-regulated,and there were no significant differences in 1 122 expressions. Results from differential expression analyses demonstrate that expressions of miR-199a-3p were significantly upregulated in MB-231Brm compared with MB-231 while miR-1246 and miR-4787-5p were down-regulated significantly. GO analyses reveal that genes which were regulated by differentially expressed miRNAs were related to cellular components,molecular functions and biological processes. Results from qPCR analyses confirmed that expressions of miR-1246 were down- regulated in MB-231Brm, compared with MB-231 (P < 0.05). CONCLUSION: There were differentially expressed miRNAs in MB-231 and MB-231Brm cells, and genes that were targeted by these miRNAs were associated with cellular components, molecular functions and biological processes during TNBC brain metastasis. Moreover, expressions of miR-1246 were down-regulated in MB-231Brm,compared with MB-231. Therefore, miR-1246 may participate in the occurrence and development of TNBC brain metastasis.

Key words: triple negative breast cancer, brain metastasis, differentially expression, microRNA, miR-1246

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