吉林大学学报(医学版) ›› 2021, Vol. 47 ›› Issue (3): 714-723.doi: 10.13481/j.1671-587X.20210323

• 临床研究 • 上一篇    下一篇

miR-30a-5p靶向调控TRIM31表达对结直肠癌细胞5-氟尿嘧啶耐药的逆转作用及其机制

卢瑞云,谷敬锋(),张建,张新,徐菲   

  1. 河北医科大学第一医院胃肠外科,河北 石家庄 050039
  • 收稿日期:2020-10-26 出版日期:2021-05-28 发布日期:2021-05-28
  • 通讯作者: 谷敬锋 E-mail:hgjf7608@163.com
  • 作者简介:卢瑞云(1984-),女,河北省灵寿县人,主治医师,医学硕士,主要从事胃肠肿瘤基础和临床方面的研究。
  • 基金资助:
    河北省中医药管理局科研计划项目(2017179)

Reverse effect of miR-30a-5p by targeting TRIM31 expression on 5-fluorouracil resistance in colorectal cancer cells and its mechanism

Ruiyun LU,Jingfeng GU(),Jian ZHANG,Xin ZHANG,Fei XU   

  1. Department of Gastrointestinal Surgery,First Hospital,Hebei Medical University,Shijiazhuang 050039,China
  • Received:2020-10-26 Online:2021-05-28 Published:2021-05-28
  • Contact: Jingfeng GU E-mail:hgjf7608@163.com

摘要: 目的

探讨miR-30a-5p靶向三结构域蛋白31(TRIM31)基因对结直肠癌(CRC)细胞5-氟尿嘧啶(5-FU)耐药的影响,并阐明其作用机制。

方法

收集27例5-FU化疗敏感(5-FU/S组)CRC患者和23例5-FU化疗耐药(5-FU/R组)CRC癌患者的CRC组织,实时荧光定量PCR(RT-qPCR)法检测癌组织中miR-30a-5p和TRIM31 mRNA表达水平,Pearson相关分析法分析miR-30a-5p和TRIM31 mRNA表达的相关性。体外培养人CRC 5-FU耐药细胞HT-29/5-FU细胞及其亲本HT-29细胞,MTT法检测2种细胞增殖活性并计算半数抑制浓度(IC50)和耐药指数(RI),RT-qPCR法检测2种细胞中miR-30a-5p和TRIM31 mRNA表达水平,Western blotting法检测2种细胞中TRIM31蛋白表达水平。将HT-29/5-FU细胞分为空白对照组、mimics NC组(转染miR-30a-5p阴性对照mimics NC)、miR-30a-5p mimics组(转染miR-30a-5p mimics)、miR-30a-5p mimics+vector组(转染miR-30a-5p mimics和阴性对照空载体)和miR-30a-5p mimics+TRIM31组(转染miR-30a-5p mimics和TRIM31过表达载体)。RT-qPCR法检测各组HT-29/5-FU细胞中miR-30a-5p和RTIM31 mRNA表达水平,Western blotting法检测各组HT-29/5-FU细胞中TRIM31蛋白表达水平,MTT法检测各组HT-29/5-FU细胞增殖活性,流式细胞术检测各组HT-29/5-FU细胞凋亡率,双荧光素酶报告基因系统验证miR-30a-5p与TRIM31的靶向关系。

结果

与5-FU/S组比较,5-FU/R组患者CRC组织中miR-30a-5p表达水平降低(P<0.01),TRIM31 mRNA表达水平升高(P<0.01),miR-30a-5p和TRIM31 mRNA表达水平呈负相关关系(R2=0.885,P<0.01)。与HT-29细胞比较,HT-29/5-FU细胞中miR-30a-5p表达水平降低(P<0.01),TRIM31 mRNA和蛋白表达水平升高(P<0.01)。HT-29/5-FU细胞和HT-29细胞的IC50值分别为(104.41±0.22)和(9.82±0.31)mg·L-1,RI值为12.42。与空白对照组和mimics NC组比较,miR-30a-5p mimics组HT-29/5-FU细胞中miR-30a-5p表达水平升高(P<0.01),TRIM31蛋白表达水平降低(P<0.01),HT-29/5-FU细胞增殖活性明显降低(P<0.01),HT-29/5-FU细胞凋亡率明显升高(P<0.01)。与miR-30a-5p mimics组比较,miR-30a-5p mimics+TRIM31组HT-29/5-FU细胞中TRIM31蛋白表达水平升高(P<0.01),HT-29/5-FU细胞增殖活性明显升高(P<0.01),HT-29/5-FU细胞凋亡率明显降低(P<0.01)。双荧光素酶报告基因系统证实TRIM31是miR-30a-5p的靶基因。

结论

miR-30a-5p通过靶向TRIM31基因表达增强CRC耐药细胞对5-FU的敏感性。

关键词: miR-30a-5p, 三结构域蛋白31, 结直肠肿瘤, 5-氟尿嘧啶, 化疗耐药

Abstract: Objective

To investigate the effect of miR-30a-5p on 5-fluorouracil (5-FU) resistant of colorectal cancer(CRC) cells by targeting tripartite motif-containing protein 31 (TRIM31) gene, and to clarify its mechanism.

Methods

The CRC tissue of 27 patients with 5-FU chemotherapy-sensitive colorectal cancer (5-FU/S group) and 23 patients with 5-FU chemotherapy-resistant colorectal cancer (5-FU/R group) were collected. The expression levels of miR-30a-5p and TRIM31 mRNA in CRC tissue of the patients were detected by Real-time fluorescence quantitative PCR(RT-qPCR) method; the correlation between miR-30a-5p and TRIM31 mRNA expressions was analyzed by Pearson correlation analysis.The human CRC 5-FU resistant cells HT-29/5-FU cells and its parent HT-29 cells were cultured in vitro. The proliferation activities of two kinds of cells were detected by MTT assay, and the median inhibitory concentration (IC50) and drug resistance index (RI) were calculated; the expression levels of miR-30a-5p and TRIM31 mRNA in two kinds of cells were detected by RT-qPCR method;the expression levels of TRIM31 protein in two kinds of cells were detected by Western blotting method. The HT-29/5-FU cells were further divided into blank control group, mimics NC group, miR-30a-5p mimics group, miR-30a-5p mimics+vector group and miR-30a-5p mimics+TRIM31 group. The cells in blank control group were not transfected, the cells in miR-30a-5p mimics group were transfected with miR-30a-5p mimics, the cells in miR-30a-5p mimics+vector group were transfected with miR-30a-5p mimics and negative control of vector, and the cells in miR-30a-5p mimics+TRIM31 group were transfected with miR-30a-5p mimics and TRIM31 over-expression vector. The expression levels of miR-30a-5p and TRIM31 mRNA in the HT-29/5-FU cells in various groups were detected by RT-qPCR method; the expression levels of TRIM31 protein in the HT-29/5-FU cells in various groups were detected by Western blotting method; the proliferation activities of the HT-29/5-FU cells in various groups were detected by MTT method; the apoptotic rates of the HT-29/5-FU cells in various groups were detected by flow cytometry;the targeted relationship between miR-30a-5p and TRIM31 was verified by dual-luciferase reporter gene system.

Results

Compared with 5-FU/S group, the expression level of miR-30a-5p in cancer tissue of the patients in 5-FU/R group was decreased (P<0.01),and the expression level of TRIM31 mRNA was increased (P<0.01). The expression levels of miR-30a-5p and TRIM31 mRNA were negatively correlated (R2=0.885,P<0.01). Compared with HT-29 cells, the expression level of miR-30a-5p in the HT-29/5-FU cells was decreased (P<0.01),and the expression levels of TRIM31 mRNA and protein were increased (P<0.01). The IC50 values of HT-29/5-FU and HT-29 cells were (104.41±0.22) and (9.82±0.31) mg·L-1, respectively, and the RI value was 12.42. Compared with blank control group or mimics NC group, the expression level of miR-30a-5p in the HT-29/5-FU cells in miR-30a-5p mimics group was increased (P<0.01), the expression level of TRIM31 protein was decreased (P<0.01), the proliferation activity of HT-29/5-FU cells was significantly decreased (P<0.01),and the apoptotic rate of HT-29/5-FU cells was significantly increased (P<0.01). Compared with miR-30a-5p mimics group, the expression level of TRIM31 protein in the HT-29/5-FU cells in imiR-30a-5p mimics+TRIM31 group was increased (P<0.01), the proliferation activity of HT-29/5-FU cells was significantly increased (P<0.01),and the apoptotic rate of HT-29/5-FU cells was significantly decreased (P<0.01).The dual-luciferase reporter system results confirmed that TRIM31 was the target gene of miR -30a-5p.

Conclusion

Over-expression of miR-30a-5p enhances the sensitivity of the CRC drug-resistance cells to 5-FU by targeting the TRIM31 gene expression.

Key words: miR-30a-5p, tripartite motif-containing protein 31, colorectal neoplasms, 5-fluorouracil, chemoresistance

中图分类号: 

  • R735.37