基础医学与临床 ›› 2019, Vol. 39 ›› Issue (5): 668-672.

• 研究论文 • 上一篇    下一篇

DNA甲基转移酶在前列腺癌中的表达及其对体外细胞增殖及侵袭能力的影响

李亚林1,刘冉录2   

  1. 1. 浙江省中医院
    2. 天津医科大学第二医院
  • 收稿日期:2018-08-30 修回日期:2018-12-01 出版日期:2019-05-05 发布日期:2019-04-24
  • 通讯作者: 刘冉录 E-mail:liuranlu1976@126.com
  • 基金资助:
    天津市自然科学基金重点项目;天津市教育委员会计划项目;天津市卫生局科技重点攻关项目;天津市卫生局科技基金面上项目

Expression of DNA methyltransferases in prostate cancer and the effects on cell proliferation and invasion in vitro

  • Received:2018-08-30 Revised:2018-12-01 Online:2019-05-05 Published:2019-04-24

摘要: 目的 探讨DNA甲基转移酶(DNMTs)在前列腺癌(PCa)组织及前列腺癌细胞系中的表达情况及其对体外前列腺癌细胞增殖、凋亡、迁移及侵袭能力的影响。方法 收集24例患者的前列腺组织样本,其中前列腺癌组织样本12例,良性前列腺增生组织样本12例。免疫组织化学染色检测DNMT1、DNMT3b的表达。通过Western blot及RT-qPCR检测前列腺癌细胞系(DU145、PC-3)及人正常前列腺上皮细胞系(RWPE-1)中DNMT1、DNMT3b的表达。使用siRNA分别下调DU145细胞系中DNMT1、DNMT3b表达,检测DU145细胞生物学行为的改变。结果 DNMT1、DNMT3b在前列腺癌组织中的表达高于前列腺增生组织(P<0.05)。DNMT1、DNMT3b在DU145、PC-3细胞系中的表达高于RWPE-1细胞系(P<0.05),且DNMT1、DNMT3b在DU145中的表达高于PC-3(P<0.05)。下调DU145细胞中DNMT1、DNMT3b的表达,可显著抑制细胞增殖,促进细胞凋亡,减弱细胞迁移及侵袭能力(P<0.05),其中DNMT1抑制组效果最显著。结论 DNA甲基转移酶(DNMT1、DNMT3b)在前列腺癌中的表达高于正常前列腺,其中DNMT1对细胞生物学行为影响最显著。

关键词: 前列腺癌, DNA甲基化, DNA甲基转移酶, siRNA

Abstract: Objective To investigate the expression of DNA methyltransferases (DNMTs) in prostate cancer tissues and prostate cancer cell lines and the effects on cell proliferation, apoptosis, migration and invasion of prostate cancer cells in vitro. Methods The prostatic tissue samples were collected from 24 patients, including 12 prostate cancer and 12 benign prostatic hyperplasia. Immunohistochemical staining was used to detect the expression of DNMT1 and DNMT3b protein. The prostate cancer cell lines (DU145, PC-3) and human normal prostate epithelial cell line (RWPE-1) were cultured. The expression of DNMT1 and DNMT3b was detected by Western blot and RT-qPCR. SiRNA was used to down regulate the expression of DNMT1 and DNMT3b in DU145 cells, and the changes in biological behaviors of DU145 cells were detected. Results The expression of DNMT1 and DNMT3b in prostate cancer tissues was higher than that in benign prostatic hyperplasia (P<0.05). The expression of DNMT1 and DNMT3b in DU145 and PC-3 cells was higher than that in RWPE-1 cells (P<0.05), and the expression of DNMT1 and DNMT3b in DU145 cells was higher than that in PC-3 cells (P<0.05). Down regulation of the expression of DNMT1 and DNMT3b in DU145 cells could significantly inhibit cell proliferation, promote cell apoptosis and reduce cell migration and invasion (P<0.05), in which the DNMT1 inhibition group had the most significant effect. Conclusions The expression of DNA methyltransferases (DNMT1 and DNMT3b) in prostate cancer is higher than that in normal prostate, and DNMT1 has the most significant effect on cell biological behaviors.

Key words: prostate cancer, DNA methylation, DNA methyltransferase, siRNA

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