[Effects of gene Livin transfection affect on the apoptosis in bladder carcinoma cells]

To investigate the effect of gene Livin transfection on the apoptosis of human bladder transitional cell carcinoma (BTCC) cells.

Target fragment containing Livin full-length cDNA was obtained from the breast cancer cells of the line MCF7. Vector pcDNA3. 1 (+)-Livin was constructed and transfected into the bladder transitional cell carcinoma (BTCC) cells of the line T24 [T24/ Livin+ cells]. Another T24 cells were transfected with the eukaryotic expression vectors pcDNA3.1 (+) [T24/pcDNA3.1 (+) cells]. T24 cells without transfection were used as blank control group. These T24 cells underwent G418 selection so as to screen the T24/Livin+ cells stably expressing the target fragment. RT-PCR was used to detect the Livin expression level in the transfected cells. After the cells were treated with mitomycin C (MMC) for 24 h, MTT method was used to detect the inhibition rate. Acridine orange (AO) staining was used to observe the apoptotic cells. The apoptotic rate was observed by flow cytometry.

RT-PCR results indicated that expression of Livin was positive in the T24/Livin+ cells, while were negative in the T24/pcDNA3.1 (+) and T24 cells. After being treated with MMC for 24 h, the apoptotic rate of the T24/Livin+ cell was (8.7 +/- 1.5)%, significantly lower than those of the T24/pcDNA3.1 (+) cells and T24 cells [(21.4 +/- 2.3)% and (19.6 +/- 2.3)% respectively, both P < 0.01].

The gene Livin increases the anti-apoptosis ability of tumor cells and the cell apoptosis induced by chemotherapy.