Project description:Colorectal cancer (CRC) is among the top five most common malignant tumors worldwide and has a high mortality rate. Identification of the mechanism of CRC and potential therapeutic targets is critical for improving survival. In the present study, we observed high expression of RAN binding protein 1 (RANBP1) in CRC tissues. Upregulated RANBP1 expression was strongly associated with TNM stages and was an independent risk factor for poor prognosis. In vitro and in vivo functional experiments demonstrated that RANBP1 promoted the proliferation and invasion of CRC cells, affected the cell cycle, and inhibited the apoptosis of CRC cells. Low RANBP1 expression reduced the expression levels of hsa-miR-18a, hsa-miR-183, and hsa-miR-106 microRNAs (miRNAs) by inhibiting the nucleoplasmic transport of precursor miRNAs (pre-miRNAs), thereby promoting the accumulation of the latter in the nucleus and reducing the expression of mature miRNAs. Further experiments and bioinformatic analyses demonstrated that RANBP1 promoted the expression of YAP by regulating miRNAs and the Hippo pathway. We also found that YAP acted as a transcriptional cofactor to activate RANBP1 transcription in combination with TEAD4 transcription factor. Thus, RANBP1 further promoted the progression of CRC by forming a positive feedback loop with YAP. Our results revealed the biological role and mechanism of RANBP1 in CRC for the first time, suggesting that RANBP1 can be used as a diagnostic molecule and a potential therapeutic target in CRC.
Project description:Epithelial-to-mesenchymal transition (EMT) is a fundamental process in development and disease. If aberrantly activated it is a trigger for tumour progression and metastasis (Thiery et al 2009 Cell). It is now known that EMT activation is also associated with the maintenance of stem-cell properties (Mani et al. 2008 Cell). Since Zinc-finger enhancer binding transcription factor 1 (ZEB1) is a crucial EMT activator, we analyzed the changes in the gene expression profile that accompany shRNA mediated loss of ZEB1 in HCT116 colorectal cancer cells. HCT116 is a cell line that exhibits mesenchymal characteristics, but reverts to an epithelial phenotype upon ZEB1 knock down (Spaderna et al. 2008 Cancer Research). HCT116 cells were stably transfected with control (GFP) or ZEB1 shRNA. Upon puromycin selection, single cell clones were picked and characterized. Cells from two control versus two ZEB1 knockdown clones were harvested, total RNA was isolated and processed to hybridization.
Project description:F-box only protein 38 (FBXO38), which belongs to SKP1-CUL1-F-box protein (SCF) family, exhibits the ability to mediate Lys48-linked poly-ubiquitination and subsequent proteasome degradations of PD-1.To investigate the effect of FBXO38 knockdown on transcription in tumor, we constructed control and FBXO38 knockdown by shRNA in Hela and HCT116 cell lines. We found that FBXO38 may interact with the immune pathway in the tumor.
Project description:Knockdown of H19 leads to cell cycle arrest, reduced cell proliferation, and reduced cell migration in HCT116 cells. We used microarrays to detail the global programme of gene expression following H19 knockdown in HCT116 cells
Project description:Transcriptional profiling of HCT116 cells compared to untreated control with HCT116 cells transfected with ZNF746 siRNA plasmid. Goal was to determine the effects of ZNF746 gene transfection on CRC progression. Two-condition experiment, HCT116 vs. ZNF746 siRNA.
Project description:Purpose: The goal of this study is to compare Next Generation Sequencing-derived transcriptome profiling (RNA-seq) of a negative control cell line to two independent shDANCR cell lines. Methods: mRNA profiles of HCT116 colorectal cancer cell lines transfected with lentiviruses containing a negative control vector and two independent shRNA vectors for DANCR knockdown were generated by deep sequencing using Illumina HiSeq2000. The sequence reads that passed quality filters were analyzed at the transcript level with the method of HISAT2, and StringTie followed by FPKM calculation. Results: Using the described data analysis workflow, we mapped about 40 million sequence reads per sample to the human genome (GRCh38) and identified about 130,000 transcripts (transcribed from about 40,000 genes) per sample with StringTie. Approximately 2.5% of the genes showed differential expression between the Control and shDANCR cell lines, with a fold change ≥1.5 and p value <0.05. Conclusions: Our study represents a detailed analysis of gene expression changes affected by DANCR knockdown in colorectal cancer cell line HCT116.