Background & Objective: PTEN (phosphatase and tensin homologue deleted from chromosome 10) is the first antioncogene with phosphatase activity till now, and was found absent or mutational in many primary malignant tumors and cell lines. Its inactivation is correlated to tumor development and prognosis. This study was to investigate the effects of PTEN transfection on proliferation and invasion of human bladder cancer cell line BIU87.
Methods: A eukaryotic expression plasmid containing PTEN, pBp-PTEN, was introduced into E. coli DH5alpha and amplified. The plasmid was prepared and purified, and then identified by restrictive enzyme digestion. pBp-PTEN was transfected into BIU87 cells, and positive cell clones (pBp-PTEN-BIU87) were selected and amplified. Empty plasmid-transfected BIU87 cells (pBp-BIU87) and normal BIU87 cells were set as control. The expression of PTEN was detected by reverse transcription-polymerase chain reaction (RT-PCR). Proliferation and invasion ability of BIU87 cells were measured before and after transfection by MTT assay and cell invasion assay.
Results: Plasmid pBp-PTEN containing PTEN was successfully constructed and transfected into BIU87 cells. After transfection, the inhibitory rates of cell growth at the first, second, third, and fourth days were 4.27%, 18.92%, 19.54%, and 17.69%, respectively. The penetrating cells were significantly less in pBp-PTEN-BIU87 group than in pBp-BIU87 and BIU87 groups (39.3+/-7.7 vs. 48.1+/-13.2 and 48.9+/-11.0, P<0.05).
Conclusion: Transfection with PTEN might suppress proliferation and invasive ability of bladder cancer BIU87 cells.
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