Liver cancer is a common malignant tumor associated with a short-survival period and high-mortality rate, and its prevalence in China is particularly high. This study aimed to investigate the effect of overexpressing the phosphatase and tensin homolog deleted on chromosome 10 (PTEN) gene on liver cancer cell apoptosis and provide new insight into the treatment of this disease.
We investigated the effects of BCL2 transfection on the cell cycle and proliferation of GES-1 cells. A pcDNA3-BCL2 plasmid was used to transfect GES-1 cell line human gastric epithelial cells. Clones were obtained by G418 screening. BCL2-positive cells were identified by fluorescence immunohistochemistry. The pcDNA3-BCL2 vectors carrying the NeoR gene were transfected into GES-1 cells, while the empty plasmid was transfected into the same cells as controls. BCL2-positive clones were screened by neomycin 418 (G418).
The aim of this study was to investigate the expression of miR-21 in esophageal cancer and the impact of miR-21 on apoptosis, invasion, and the expression of target genes in esophageal cancer cells. Fluorescence quantitative polymerase chain reaction analysis was used to detect the expression of miR-21 in human esophageal tissues, adjacent tissues, and an esophageal cancer cell line (TE-13). The antisense miR-21 oligonucleotide was generated commercially using the solid-phase chemical synthesis method.
This study investigated the effects of stable transfection of the exogenous wild-type DCC gene on growth of the human colorectal carcinoma cell line SW1116 in vitro. The DCC gene was amplified from normal human colon tissue by reverse transcription-polymerase chain reaction and used to construct a recombinant expression plasmid, pcDNA3.1(+)-DCC. DCC-negative SW1116 cells were transfected with pcDNA3.1(+)-DCC. Cell viability was tested by the methyl thiazolyl tetrazolium (MTT) assay.
The neomycin-resistance (neor) gene is widely used as a selectable marker in eukaryotic expression vectors; however, its expression often affects that of target genes. Cre recombinase recognizes LoxP sites, leading to site-specific recombination and deletion of DNA and RNA between two LoxP sites. In the present study, a humanized Fat-1 gene (hFat-1) was generated by DNA Works and used to construct a pC-PGK-neor-hfat-1 expression vector, in which PGK-neor was flanked by two LoxP sites.