实用医学杂志 ›› 2022, Vol. 38 ›› Issue (12): 1475-1485.doi: 10.3969/j.issn.1006⁃5725.2022.12.007

• 基础研究 • 上一篇    下一篇

Mus81基因沉默对MCF⁃7人乳腺癌细胞系增殖凋亡及化疗敏感性的影响

常颖智1 赵俐1 张年伟1 熊白玉1 吴帆2    

  1. 1 广州市第一人民医院,华南理工大学附属第二医院乳腺外科(广州 510180); 2 广州市红十字会医院普通外科(广州 510220)

  • 出版日期:2022-06-25 发布日期:2022-06-25
  • 基金资助:
    国家自然科学基金面上项目(编号:81974442);广东省自然科学基金面上项目(编号:2020A1515010799);广州市医药卫
    生科技项目(编号:20131A011006)

Effects of methyl methansulfonate and UV sensitive gene clone 81 on proliferation,apoptosis and chemo⁃ sensitivity of MCF ⁃7 human breast cancer cell line 

CHANG Yingzhi*,ZHAO Li,ZHANG Nianwei,XIONG Baiyu,WU Fan.    

  1. Department of Breast Surgery,Guangzhou First People′s Hospital,the Second Affiliated Hospital of South China University of Technology,Guangzhou 510180,China

  • Online:2022-06-25 Published:2022-06-25

摘要:

目的 研究 Mus81 基因沉默对 MCF⁃7 人乳腺癌细胞系增殖、凋亡和化疗敏感性的影响并初 步探讨其调控机制。方法 首先构建 Mus81 沉默的 MCF⁃7 乳腺癌细胞系,使用噻唑蓝(MTT)法和平板克 隆实验检测细胞生长和增殖,碘化丙锭(PI)染色法和膜联蛋白 V(Annexin V)⁃APC 染色法检测细胞周期及 凋亡的变化。qRT⁃PCR 检测 Mus81 沉默后下游基因的表达,MTT 法检测化疗药物的 50%抑制浓度(IC50)及 逆转指数(RI)。结果 (1)MTT 生长曲线和平板克隆实验显示 Mus81 基因沉默后 MCF⁃7 细胞系增殖显著减缓(< 0.001),细胞克隆数明显下降(< 0.001)。(2)Annexin V⁃APC 和 PI 染色检测显示 MCF⁃7 细胞凋 亡率升高(< 0.001),并出现明显的 G2/M 期阻滞。(3)MTT 检测结果显示,Mus81 沉默后 MCF⁃7 细胞对顺 铂、阿霉素、表阿霉素和 5⁃氟尿嘧啶的 IC50值明显降低,RI 依次为 5.118、3.070、3.027 及 8.997。(4)qRT⁃PCR 及 Western blot 检测下游信号通路表达的结果显示,Mus81 沉默后 MCF⁃7 细胞中的 APAF1、APC 和 PTEN 基 因表达升高,MAPK3 和 MAPK1 基因表达降低。结论 Mus81 基因沉默可明显抑制 MCF⁃7 人乳腺癌细胞系 的生长增殖并诱导 G2/M 期阻滞及细胞凋亡,还可提高 MCF⁃7 细胞对顺铂、阿霉素、表阿霉素和 5⁃氟尿嘧 啶的敏感性,其机制可能与调控 APAF1、APC、PTEN、MAPK1 及 MAPK3 等下游基因的表达有关,提示 Mus81可能是一个潜在的乳腺癌治疗靶点。

关键词:

甲磺酸盐及紫外线敏感性81号基因, 乳腺癌, 增殖, 凋亡, 化疗敏感性

Abstract:

Objective To study the effect of Mus81 gene silencing on the proliferation,apoptosis and chemosensitivity of MCF ⁃7 human breast cancer cell line,and to preliminarily explore its regulatory mechanism. Methods Mus81⁃silenced MCF ⁃7 breast cancer cell line was initially constructed. Cell growth and proliferation were detected by thiazolyl blue(MTT)method and plate cloning assay. Propidium iodide(PI)staining and Annexin V⁃APC staining were used to detect changes in cell cycle and apoptosis. qRT⁃PCR detected the expression of down⁃ stream genes after Mus81 was silenced,and MTT method detected the 50% inhibitory concentration(IC50)and reversal index(RI)of chemotherapy drugs. Results The MTT growth curve and plate cloning assay showed that the proliferation of MCF ⁃7 cell line was significantly retarded after Mus81 gene silencing(P < 0.001),and the number of cell clones was significantly decreased(P < 0.001). Annexin V ⁃APC and PI staining showed that the apoptotic rate of MCF⁃7 cells increased(P < 0.001),and obvious G2/M phase arrest developed. MTT test results showed that the IC50 values of MCF ⁃7 cells to cisplatin,doxorubicin,epirubicin and 5⁃fluorouracil were signifi⁃ cantly reduced after Mus81 silencing,and the RI was 5.118,3.070,3.027 and 8.997 respectively. The results of qRT⁃PCR and Western blot for detecting the expression of downstream signaling pathways showed that the expres⁃ sions of APAF1,APC and PTEN genes in MCF⁃7 cells increased after Mus81 silencing,while the expressions of MAPK3 and MAPK1 genes decreased. Conclusions Mus81 gene silencing can significantly inhibit the growth and proliferation of the MCF⁃7 human breast cancer cell line and induce G2/M phase arrest and apoptosis. It can also increase the sensitivity of MCF ⁃ 7 cells to cisplatin,doxorubicin,epirubicin and 5⁃fluorouracil. The mechanismmay be related to the regulation of the expressions of downstream genes APAF1,APC,PTEN,MAPK1 and MAPK3 suggesting that Mus81 may be a potential therapeutic target of breast cancer.

Key words:

methyl methanesulfonate and UV sensitive gene clone 81, breast cancer, proliferation, apoptosis, chemosensitivity