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MiR-199a-5p and miR-375 affect colon cancer cell sensitivity to cetuximab by targeting PHLPP1

机译:MiR-199A-5P和MIR-375通过靶向PHLPP1对Cetuximab产生结肠癌细胞敏感性

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Objectives: We aimed to analyze the differentially-expressed miRNAs in colon cancer cells in order to identify novel potential biomarkers involved in cancer cell resistance.Design and methods: We investigated the miRNA expression profile of GEO human colon carcinoma cells, sensitive to the EGFR inhibitor Cetuximab (CTX) and their CTX-resistant counterpart (GEO CR) by using a miRNA chip. Results: We found 27 upregulated and 10 downregulated miRNAs in GEO CR compared with GEO cells with a fold change > 2. Among the upregulated miRNAs, we focused on miR-199a-5p and miR-375. We report that their enforced expression promotes CTX resistance, whereas their silencing sensitizes to the same drug. The ability of miR-199a-5p and miR-375 to target PHLPP1 (PH domain and leucine-rich repeat protein phosphatase 1), a tumor suppressor that negatively regulates the AKT pathway, accounts, at least in part, for their drug-resistance activity. Indeed, restoration of PHLPP1 increases sensitivity of the GEO cells to CTX and reverts the resistance-promoting effect of miR-199a-5p and miR-375.Conclusion: This study proposes miR-199a-5p and miR-375 as contributors to CTX resistance in colon cancer and suggests a novel approach based on miRNAs as tools for the therapy of this tumor.
机译:目的:我们旨在分析结肠癌细胞中的差异表达的miRNA,以识别参与癌细胞抵抗的新型潜在生物标志物。指导和方法:我们研究了Geo人结肠癌细胞的miRNA表达谱,对EGFR抑制剂敏感通过使用MiRNA芯片,Cetuximab(CTX)及其CTX抗性对应物(Geo CR)。结果:我们发现27个上调和10个下调的miRNA与Geo Cr,与折叠变化的地理细胞相比> 2.在上调的miRNA中,我们专注于MiR-199A-5P和MIR-375。我们报告称,他们的强迫表达促进了CTX阻力,而他们的沉默敏感到同一药物。 miR-199a-5p和miR-375靶向phlpp1的能力(pH结构孔和富含亮氨酸 - 富含蛋白质磷酸酶1),一种肿瘤抑制剂,其负调节Akt途径,至少部分地用于其耐药性活动。实际上,PHLPP1的恢复增加了Geo细胞对CTX的敏感性,并恢复了miR-199A-5P和MIR-375的抗性促进效果。结论:本研究提出了MIR-199A-5P和MIR-375作为CTX抗性的贡献者在结肠癌中,提出了一种基于MiRNA作为这种肿瘤治疗的工具的新方法。

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