Long Non-coding RNA-p21 Regulates the MicroRNA-9 / Sirtuin-1 Signaling Pathway to Reverse Oxaliplatin Resistance in Colorectal Cancer Cells
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摘要:
目的 探讨长链非编码RNA(LncRNA)-p21调控微小RNA-9(miR-9)/去乙酰化酶1(SIRT1)信号通路逆转结直肠癌(CRC)奥沙利铂相关的细胞自噬及耐药性的分子机制。 方法 采用qPCR方法LncRNA-p21的表达检测,Westbloting blotting法检测细胞自噬相关蛋白(微管相关蛋白1轻链3-Ⅰ((LC3-I)、微管相关蛋白1轻链3-Ⅱ(LC3-Ⅱ)),自噬底物 (P62)、去乙酰化酶1(Sirtuin-1,SIRT1)、miR-9 的表达水平;克隆形成实验检测细胞活性。 结果 (1)LncRNA-p21 在奥沙利铂耐药的结直肠肿瘤细胞 HCT116,SW620 中高表达,差异有统计学意义(P < 0.001);(2)敲降 LncRNA-p21 可抑制细胞自噬,改善 HCT116 细胞对奥沙利铂的化疗敏感性;(3)敲降 LncRNA-p21 后 miR-9 表达上调,而miR-9 过表达可增强 HCT116 细胞对奥沙利铂的化疗敏感性,差异有统计学意义(P < 0.001);(4)同时,SIRT1 的表达受到 LncRNA-p21 和 miR-9 的调控。 结论 结直肠肿瘤对于化疗药奥沙利铂抵抗可能由LncRNA-p21诱导细胞自噬增强而引起,其过程可能通过 LncRNA-p21调控miR-9/SIRT1信号通路而实现。 -
关键词:
- 奥沙利铂 /
- 长链非编码RNA-p21 /
- miR-9/SIRT1信号通路 /
- 耐药性 /
- 细胞自噬 /
- 结直肠癌
Abstract:Objectives To discuss the molecular mechanism of long non-coding RNA(lncRNA)-P21 regulating (miR-9) /Sirtuin-1(SIRT1) signaling pathway in reversing colorectal cancer (CRC) cell autophagy and drug resistance. Methods Real-time fluorescent quantitative PCR (RT-qPCR) was employed to assess the expression level of LncRNA-p21 in cell lines. Western blotting was performed to measure the expression of SIRT1, miR-9 and autophagy related proteins in CRC cell. Clone formation assay was used to detect the cell activity. Results (1) LncRNA-p21 was highly expressed in oxaliplatin - resistant CRC cells HCT116 and SW620. (2) The knockdown of LncRNA-p21was able to inhibit autophagy and improve the chemotherapy sensitivity of HCT116 cells to oxaliplatin. (3) After LncRNA-p21 was knocked down, the expression of miR-9 was up-regulated, while the overexpression of miR-9 could enhance the chemotherapy sensitivity of HCT116 cells to oxaliplatin. Meanwhile, the expression of SIRT1 was regulated by LncRNA-p21 and miR-9. Conclusion CRC resistance to chemotherapy drug oxaliplatin may be caused by autophagy induced by LncRNA-P21, which may be realized through the regulation of the miR-9 /SIRT1 signaling pathway by LncRNA-P21. -
Key words:
- Oxaliplatin /
- LncRNA-p21 /
- miR-9/SIRT1 signaling pathways /
- Tolerance /
- Autophagy /
- Colorectal cancer
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图 2 敲降 LncRNA-p21 能够提高 HCT116 对奥沙利铂的化疗敏感性
A:通过qPCR 检测敲降 HCT116 细胞中 LncRNA-p21的敲降效率;B:敲降 LncRNA-p21 以及对照 HCT116 细胞中检测自噬特异性分子LC3-Ⅱ/LC3-Ⅰ,自噬底物 P62; C、D:将敲降 LncRNA-p21 以及对照HCT116 细胞使用奥沙利铂处理后,检测克隆形成情况。 与对照组比较,**P < 0.001 。
Figure 2. Knockdown lncrNA-P21 can increase the chemosensitivity of HCT116 to oxaliplatin.
图 4 过表达 miR-9 的增强 HCT116 细胞对奥沙利铂的化疗敏感性
A:通过细胞转染的方式在 HCT116 细胞中过表达 miR-9,使用 qPCR 检测转染效率;B:在过表达miR-9 的细胞中检测自噬特异性分子 LC3-Ⅱ/LC3-Ⅰ,自噬底物 P62;C、D:在过表达 miR-9 的 HCT116 细胞中使用奥沙利铂处理后检测克隆形成,发现过表达 miR-9 可改善 HCT116 细胞对奥沙利铂的化疗抵抗。 与对照组比较,*P < 0.01,**P < 0.001。
Figure 4. Overexpression of miR-9 enhances the chemosensitivity of HCT116 cells to oxaliplatin
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