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首页> 外文期刊>Digestive Diseases and Sciences >Negative Regulation of Kruppel-Like Factor 4 on microRNA-106a at Upstream Transcriptional Level and the Role in Gastric Cancer Metastasis
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Negative Regulation of Kruppel-Like Factor 4 on microRNA-106a at Upstream Transcriptional Level and the Role in Gastric Cancer Metastasis

机译:在上游转录水平下微小RORNA-106a对微小瘤-106a的阴性调节及胃癌转移中的作用

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BackgroundMicroRNAs are classes of endogenous noncoding RNAs that play a substantial role in tumor processes through regulating the targets atposttranscriptional level. However, little is known about the upstream transcription regulatory mechanism although it is a prerequisite for investigation of its aberrant expression and function.AimsThis report evaluates miR-106a's direct transcriptional factor from upstream level to in depth elucidate their communication in gastric cancer development.MethodsGastric cancer tissues were collected to analyze the miR-106a expression using real-time PCR methods. The combination of Kruppel (or Kruppel)-like factor 4 (KLF4) to miR-106a promoter was testified through bioinformatics followed by construction of luciferase reporter plasmid and chromatin immunoprecipitation assay. Functional experiments and mouse models for evaluating cell growth and metastasis were conducted to observe the biological effect of KLF4 on miR-106a. The interplay between KLF4 and miR-106a was tested with Wnt activator and confirmed in clinical specimens.ResultsThe up-regulated miR-106a linked to gastric cancer metastasis and epithelial-mesenchymal transition. UCSC and JASPAR predicted the promoter sequence of miR-106a and its binding site with transcriptional factor KLF4. Construction of reporter gene further verified their direct combination at upstream level. Moreover, the inhibitory effect of KLF4 on the phenotype of gastric cancer cells could be restored by miR-106a. CHIR-induced experiment and clinical specimens confirmed the negative regulation of KLF4 on miR-106a.ConclusionsOur findings provide novel direct insights into molecular mechanisms for interaction of KLF4 and miR-106a at upstream level and new ways for clinical application of KLF4-miR-106a axis in advanced gastric cancer metastasis.
机译:背景宫殿是内源性非致rnas的类,通过调节Atthosttranscription水平的目标在肿瘤过程中发挥重要作用。然而,关于上游转录调节机制的知名虽然是调查其异常表达和功能的先决条件。事宜,报告评估MIR-106A从上游水平的直接转录因素深入阐明其在胃癌发育中的沟通。水平癌症收集组织以使用实时PCR方法分析miR-106a表达。通过生物信息学证书Kruppel(或Krupel)-like因子4(KLF4)与miR-106a启动子的组合,然后用荧光素酶报告质粒和染色质免疫沉淀测定的构建。进行用于评估细胞生长和转移的功能实验和小鼠模型,观察KLF4对miR-106a的生物学效果。用WNT活化剂测试KLF4和MIR-106A之间的相互作用,并在临床标本中证实。较上调的MIR-106A与胃癌转移和上皮 - 间充质转换有关。 UCSC和Jaspar预测MiR-106a的启动子序列及其与转录因子K1F4的结合位点。报告基因的构建进一步验证了在上游水平的直接组合。此外,KLF4对胃癌细胞表型的抑制作用可以通过miR-106a恢复。 Chir诱导的实验和临床标本证实了KLF4对miR-106a的负调节。CONCLUSION调查结果,提供了KLF4和MIR-106A在上游水平和KLF4-MIR-106A临床应用的新方法中进行了新的直接见解。晚期胃癌转移的轴。

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