Objective:Colorectal cancer is one of the common gastrointestinal tumors.Recent studies have shown that, the expression of PDEF can promote the differentiation of Secretory progenitor cells to goblet cells in the intestinal tissue.Therefore the oc-currence of colorectal cancer may be related to expression of PDEF.In this study,we tried to investigate the effects of proliferation and invasion after interference targeting prostate-derived ETS factor in colorectal cell lines HT29.Methods: HT29 cells were transiently transfected with PDEF shRNA plasmids and blank control plasmid via cathodolyte liposome transfection method.By fluorescence microscopy,RT-PCR,Western blot technique to detect the expression of PDEF mRNA and protein in normal control group,blank control group,shRNA group.The proliferation and invasion ability of HT29 cells after transfection were assessed by MTT assay and Transwell invasion assay respectively.Results: Green fluorescent protein was observed in blank control plasmid group and shRNA plasmid group.Western blot showed the reduced PDEF protein expression compared with normal control group and blank control group.Interference PDEF gene expression can significantly promote the proliferation of HT29 cells (P<0.05).The ability of cell invasion in interference group was significantly higher than the normal control group and blank control group after 48h ( P<0.05).Conclusion:Interference PDEF in HT29 cells can promote cell proliferation and invasion.

Objective:To analyze the expression of the recombinant human phenylalanine-tRNA ligase beta subunit(FARSB)gene in hepatocellular carcinoma(HCC)and explore its association with clinicopathologic characteristics and prognosis.Methods:Data sets of hepatocellular carcinoma and paracancerous tissues were downloaded from the Cancer Genome Atlas(TCGA), and the data were analyzed using the R and Perl programming languages.Cox regression and the Kaplan-Meier method were used to analyze the relationship between clinicopathological characteristics and overall survival.Gene set enrichment analysis(GSEA)was used to predict the signal pathways involved in the regulation of FARSB.qPCR and Western blot were used to verify the expression level of FARSB in hepatocellular carcinoma and adjacent tissues.Results:FARSB was highly expressed in HCC and the prognosis of HCC patients with high FARSB expression was poor.The clinical stage, T stage, M stage and FARSB were significantly correlated with overall survival, while only high FARSB expression was an independent prognostic factor in HCC patients.Conclusions:High expression of FARSB indicates a poor prognosis in HCC patients and FARSB can be used as a marker for poor prognosis in HCC.