The molecular mechanism of PML in inducing apoptosis of bladder cancer cell line

Objective: Study the affection of inducing expression of PML in the apoptosis and the molecular mechanism of bladder cancer. Methods: PMEP4/PML inducible expression vector was transfected into bladder cancer UM-UC-2 cells by lipofectamine2000 system. The positive clone cells were selected by 300 μg/ml hygromycin B and confirmed by laser confocal imaging system. Then, using the in vitro DNA ladder apoptotic assay and Western blot, the affection of inducing expression of PML on apoptosis and its molecular mechanism of bladder cancer cell was studied. Results: Comparing with the vector control group, PML specific nuclear speckle significantly increased in the PMEP4/PML bladder cells. DNA ladder assay demonstrated bladder cancer cell expressing PML occurred apoptosis while the control vector cells were not influenced. Overexpresssion of PML could reduce Survivin expression and upregulate caspase3 and cleaved PARP protein expression Conclusion: Our results demonstrated that overexpression of PML could induce bladder cancer cell apoptosis through the caspase dependent pathways.