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毛细管电泳法检测耐米托蒽醌乳腺癌细胞系全基因组甲基化水平

邓婷婷,谢  妮,黄艳华,黄海燕,李子刚,胡章立,袁建辉   

  1. 1. 深圳大学生命科学学院,广东   深圳   518060;2. 深圳市疾病预防控制中心,广东  深圳  518055;3. 深圳大学第一附属医院 深圳市第二人民医院,广东  深圳  518035;4. 北京大学深圳研究生院,广东  深圳  518055
  • 收稿日期:2013-07-08 修回日期:2013-08-29 出版日期:2014-03-30 发布日期:2014-03-30
  • 通讯作者: 邓婷婷 (1989- ),女,硕士,研究方向:肿瘤耐药机制研究。
  • 作者简介:邓婷婷 (1989- ),女,硕士,研究方向:肿瘤耐药机制研究。
  • 基金资助:

    国家自然科学基金 (30500599),广东省自然科学基金(915150310 2000019),深圳市科技计划重点项目 (201201028),深圳市科技研发资金项目 (JCYJ20120615085512920;JCYJ20120613171430 264;ZYC201006180477A),深圳市孔雀计划 (KQTD201103)

Determination of genomic DNA methylation levels in mitoxantrone-resistant breast cancer cell lines by capillary electrophoresis

DENG Ting-ting, XIE Ni,HUANG Yan-hua,HUANG Hai-yan,LI Zi-gang,HU Zhang-li, YUAN Jian-hui   

  1. 1. College of Life Sciences, Shenzhen University, Shenzhen 518060; 2. Shenzhen Center for Disease Control and Prevention, Shenzhen 518055; 3. The First Affiliated Hospital, Shenzhen University, Shenzhen 518035; 4.Shenzhen Graduate School, Peking University, Shenzhen 518055, Guangdong, China
  • Received:2013-07-08 Revised:2013-08-29 Online:2014-03-30 Published:2014-03-30
  • Contact: 邓婷婷 (1989- ),女,硕士,研究方向:肿瘤耐药机制研究。
  • About author:邓婷婷 (1989- ),女,硕士,研究方向:肿瘤耐药机制研究。

摘要:

目的: 建立对米托蒽醌(Mit)耐药的乳腺癌MCF-7细胞系,并探讨乳腺癌细胞产生耐药与其基因组甲基化水平之间的关系。方法:用0.005、0.010和0.020 μmol/L浓度的米托蒽醌染毒乳腺癌MCF-7细胞,建立对米托蒽醌不同耐药程度的MCF-7耐药细胞系,采用流式细胞术检测各染毒组MCF-7细胞内药物荧光强度D(755)值,确定Mit耐药细胞系的建立;提取各组细胞的DNA, 利用毛细管电泳法检测野生型对照组及各染毒组细胞全基因组DNA甲基化水平。结果:野生型对照组、0.005、0.010和0.020 μmol/L米托蒽醌染毒组的D(755)值依次为16.1±0.04、14.3±0.12、13.3±0.07和9.7±0.08,与野生型对照组相比,随着药物染毒浓度的增加,MCF-7细胞内药物的D(755)值逐渐减少,其中0.020 μmol/L染毒组较对照组显著减少,差异有统计学意义 (P<0.05),表明细胞耐药性增强;而上述各组DNA甲基化水平依次为42.25%±0.64%、37.97%±1.18%、34.27%±0.14%、31.16%±0.80%,与野生型对照组相比,各染毒组细胞基因组DNA甲基化水平逐渐降低 (P<0.05),且各染毒组间两两比较差异均具有统计学意义 (P均<0.05)。结论:成功建立了对Mit耐药的MCF-7细胞系;确定了毛细管电泳法检测基因组DNA甲基化水平的电泳分离条件。

关键词: 毛细管电泳, DNA甲基化, MCF-7细胞, 流式细胞术

Abstract:

OBJECTIVE: To establish a mitoxantrone-resistant MCF-7 breast cancer cell line,and to explore the relationship between breast cancer cells developing drug resistance and their genomic methylation levels. METHODS:Using cells infected with 0,0.005,0.010 and 0.020 μmol/L mitoxantrone,different levels of drug resistance of MCF-7/Mit cell line was established. Flow cytometer was used to detect the accumulation of mitoxantrone in MCF-7 cells to confirm drug resistant cell lines. Then,we used capillary electrophoresis to evaluate genomic DNA methylation levels of wide type and cells with different degrees of resistance. RESULTS:Compared with the control group,with increasing mitoxantrone concentration,drug accumulation gradually decreased in MCF-7 cells. In the wild-type control group,0.005,0.010 and 0.020 μmol/L -treated groups the drug D(755) values were 16.1±0.04, 14.3± 0.12,13.3±0.07 and 9.7±0.08,respectively. The 0.02 μmol/L exposure group was significantly reduced compared with the control group,indicating that drug resistance was significantly increased (P<0.05). In the wild-type control group,0.005,0.010 and 0.020 μmol/L -treated groups,the DNA methylation levels were 42.25%± 0.64%,37.97%± 1.18%,34.27%±0.14% and 31.16%±0.80%, respectively. Compared with the control group, genomic DNA methylation levels in each group of treated cells gradually decreased (P<0.05),with significant differences between each two groups (P<0.05). CONCLUSION:Mit drug-resistant MCF-7 cell line was successfully set up. The separation condition of capillary electrophoresis when measuring genomic DNA methylation levels was determined.

Key words: capillary electrophoresis, DNA methylation, MCF-7 cell, flow cytometer