Wu T, Xu HM, Wu XH, Jiang CG, Yu M. RNAi-mediated gene silencing of transforming growth factor-β1 expression in human gastric cancer cell line SGC-7901 and peritoneal mesothelial cells.
Shijie Huaren Xiaohua Zazhi 2005;
13:2530-2534. [DOI:
10.11569/wcjd.v13.i21.2530]
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Abstract
AIM: To silence the expression of transforming growth factor-β1 (TGF-β1) gene in human gastric cancer cell line SGC-7901 and peritoneal mesothelial cells using vector based RNA interference (RNAi) technique.
METHODS: A vector, which was used to transcribe functional short interfering RNA (siRNA), was construc-ted, and 62 mer oligonucleotide fragment was inserted into the downstream of the hU6 promoter. Mesothelial cells were isolated from human omenta by trypsin-EDTA disaggregation, and identified by morphology and streptomyces anti-biotin protein-peroxidase meth-od. The plasmids containing TGF-β1 target sequences were transfected into the two kinds of cells menti-oned above, and then the expression level of TGF-β1 was detected by semiquantitive RT-PCR and Western blot technique.
RESULTS: Electrophoresis and DNA sequencing con-firmed that the TGF-β1-specific siRNA was synthesized and cloned into the expression vector pcPUR β iCassette successfully. Immunohistochemistry showed positive staining for cytokeratin and vimentin, but negative staining for leukocyte common antigen and factor VIII-related antigen in cultured mesothelial cells. As compared with their respective untreated group, the TGF-β1 mRNA and protein expression in the two kinds of transfected cells were remarkably decreased, especially TGF-β1 protein. TGF-β1 protein was reduced by a perce-nt of 65.8% and 61.8% in human gastric cancer cell line SGC-7901 and mesothelial cells, respectively.
CONCLUSION: TGF-β1 expression can be notably inh-ibited in human gastric cancer cell line SGC-7901 and peritoneal mesothelial cells using plasmid-based TGF-β1-RNAi technique.
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