实用医学杂志 ›› 2021, Vol. 37 ›› Issue (23): 2984-2988.doi: 10.3969/j.issn.1006⁃5725.2021.23.005

• 基础研究 • 上一篇    下一篇

miR⁃140⁃5p通过调节自噬影响结直肠癌细胞对奥沙利铂的敏感性

延飞飞 李宏武   

  1. 中国医科大学附属第四医院普外科(沈阳 110032)

  • 出版日期:2021-12-10 发布日期:2021-12-10
  • 通讯作者: 李宏武 E⁃mail:lhw⁃005@163.com
  • 基金资助:
    辽宁省自然科学基金项目(编号:JC2019021)

MicroRNA ⁃140⁃5p affects the sensitivity of colorectal cancer cells to oxaliplatin by regulating autophagy

YAN Feifei,LI Hongwu.   

  1. Department of General Surgery,the Fourth Affiliated Hospital of China Medical University Shenyang 110032,China

  • Online:2021-12-10 Published:2021-12-10
  • Contact: LI Hongwu E⁃mail:lhw⁃005@163.com

摘要:

目的 探讨 miR⁃140⁃5p 对结直肠癌(CRC)细胞自噬的调控及对奥沙利铂敏感性的影响。 方法 采用实时荧光定量多聚核苷酸链式反应(RT⁃qPCR)检测 30 CRC 组织与相应癌旁组织中 miR⁃ 140⁃5p mRNA 的表达水平,并检测 miR⁃140⁃5p mRNA CRC 细胞系及正常结直肠细胞系中的表达情况。 通过 miR⁃140⁃5p mimics 转染 CRC 细胞 HCT 116,RT⁃qPCR 检测转染效率;细胞计数试剂(CCK⁃8)法检测转 染组和对照组在奥沙利铂处理下的细胞活性;蛋白质印迹法(Western blot)检测微管相关蛋白轻链 3(LC3 的表达;免疫荧光检测 LC3 荧光斑点的表达。转染 miR⁃140⁃5p mimics 并共处理自噬激活剂雷帕霉素后, CCK⁃8 法检测共处理组和单独转染 miR⁃140⁃5p mimics CRC 细胞对奥沙利铂的敏感性;克隆形成实验检 CRC 细胞增殖水平。结果 miR⁃140⁃5p CRC 组织和 CRC 细胞系中的表达分别低于相应癌旁组织和 正常结直肠细胞系,差异有统计学意义(P < 0.05)。CCK⁃8 结果表明,过表达 miR⁃140⁃5p 促进 CRC 细胞对 奥沙利铂的敏感性(P < 0.05);Western blot 表明过表达 miR⁃140⁃5p 促进自 LC3II/I 表达水平降低,免疫荧 光表明过表达 miR⁃140⁃5p 抑制 LC3 荧光斑点表达(P < 0.05)。过表达 miR⁃140⁃5p 与雷帕霉素共处理后, CCK⁃8 表明与单独转染 miR⁃140⁃5p mimics 组相比,共处理组细胞对奥沙利铂敏感性降低;克隆形成实验表 明共处理组细胞增殖水平相对增加。结论 CRC 组织和 CRC 细胞系中 miR⁃140⁃5p 的表达分别低于相应 癌旁组织和正常结直肠细胞系,miR⁃140⁃5p 通过抑制自噬促进了 CRC 细胞对奥沙利铂的敏感性,可能为 CRC 的靶向治疗提供一定的策略。

关键词:

结直肠癌, miR?140?5p, 奥沙利铂, 耐药, 自噬

Abstract:

Objective To investigate the effect of miR⁃140⁃5p on autophagy and oxaliplatin sensitivity in colorectal cancer(CRC)cells. Methods The expression of miR⁃140⁃5p mRNA in CRC tissues and adjacent tissues of 30 patients was detected by real⁃time quantitative polynucleotide chain reaction(RT⁃qPCR). The expres⁃ sion of miR⁃140⁃5p mRNA in CRC cells and normal colorectal cells was detected. CRC cells HCT 116 were trans⁃ fected by miR⁃140⁃5p mimics and the transfection efficiency was measured by RT⁃qPCR. CCK⁃8 was used to detect the cell viability of the transfected group and the control group. The expression of microtubule associated protein light chain 3(LC3)was detected by western blot. Expression of LC3 fluorescence spots was detected by immunoflu⁃ orescence. After transfection with miR⁃140⁃5p mimics and co⁃treatment of autophagy activator rapamycin,CCK⁃8 was used to detect the sensitivity of CRC cells to oxaliplatin in the co⁃treated group and the transfected miR⁃140⁃5p mimics group. Clone formation assay was used to detect the proliferation of CRC cells. Results The expression of miR ⁃140⁃5p in CRC tissues and CRC cell lines was significantly lower than that in adjacent tissues and normal colorectal cell lines(P < 0.05). CCK⁃8 results showed that overexpression of miR⁃140⁃5p promoted the sensitivity of CRC cells to oxaliplatin(P < 0.05). Western blot showed that overexpression of miR⁃140⁃5p promotes reduced expression levels of LC3II/I,immunofluorescence showed that overexpression of miR⁃140⁃5p inhibited the expres⁃ sion of LC3 fluorescent spots(P < 0.05). After overexpression of miR⁃140⁃5p was co⁃treated with rapamycin,CCK⁃8showed that cells in co⁃treated group were less sensitive to oxaliplatin than those in the miR⁃140⁃5p mimics group alone. Clone formation experiment showed that the cell proliferation level of co ⁃treatment group increased. Conclusion The expression of miR⁃140⁃5p in CRC tissues and CRC cell lines is lower than that in adjacent tis⁃ sues and normal colorectal cell lines,respectively. MiR⁃140⁃5p promotes the sensitivity of CRC cells to oxaliplatin by inhibiting autophagy,which may provide a strategy for targeted therapy of CRC.

Key words: colorectal cancer,  , miR?140?5p,  , oxaliplatin,  , drug resistance,  , autophagy ,