[The Influence of New Medium with RGD on Cell Growth,Cell Fusion and Expression of Exogenous Gene]

To investigate the influence of a new culture medium added with RGD on cell growth,cell fusion and expression of exogenous gene.

A new medium was prepared by adding different concentrations of RGD to ordinary culture medium. The optimum concentration of RGD was determined by observation of the growth of human pancreatic epithelial cell line HPDE6-C7. After determining the optimum concentration of RGD,different concentrations of cells HPDE6-C7 (5×10⁴,10⁵,5×10⁵ mL^－1) were inoculated in the two mediums. The morphology,adherence,growth and density of the cells were observed by inverted microscope; The ratio of clone formation and the positive rate of cloning were compared between the two cultures after fusion; The fluorescence intensity after the transfection of plasmid with green fluorescent protein (GFP) and the protein expression after transfection of plasmid with KRAS were observed to campare the expression of exogenous genes between the new medium with ordinary medium.

Firstly,the optimal concentration of RGD was 10 ng/mL. Compared with the normal medium,the cultured cells with RGD had better morphology,adhesion and faster proliferation. In addition,both of the number and positive rate of clones formed in the new medium were significantly higher than that in the ordinary medium (P<0.05);The fluorescence intensity after transfection of exogenous gene GFP in the new medium was significantly higher than that in normal medium (P<0.05); Expression level of exogenous gene KRAS of the new medium was also significantly higher than that in normal medium.

The new culture medium has highlighted advantages in cell growth,cell fusion and expression of exogenous genes. RGD peptide has widely prospect and potential value in the cell culture.