Overexpression of Tat-interacting protein 30 inhibits the proliferation, migration, invasion and promotes apoptosis in bladder cancer cells

Aims: Tat-interacting protein 30 (TIP30), a transcriptional repressor, possesses antitumor effect in different cancer cells. However, little is known about the function of TIP30 in bladder cancer till now. Materials and Methods: A TIP30-overexpressing plasmid was transfected into the bladder cancer cells (T24). The cell cycle and apoptosis were detected by flow cytometry. The cell proliferation was analyzed using the cell counting kit-8 assay. The migrative and invasive abilities of T24 cells were measured by the transwell assay. The expression of TIP30, cell cycle proteins, migration-related proteins, and cell apoptosis-related proteins was assessed by Western blotting. Results: The cell proliferation, migration, and invasion of T24 cells were inhibited by overexpression of TIP30. Moreover, the rate of cell apoptosis was increased by the overexpression of TIP30. The expression of cell cycle proteins, phosphorylated EGFR, p-Akt, Bcl-2, cyclin D, cyclin E), migration-related proteins (matrix metalloproteinases 2 [MMP2], MMP6, MMP9), were downregulated, and cell apoptosis-related proteins (bax, cleaved caspase3) were upregulated. Conclusions: These results suggest that TIP30, as a tumor suppressor in the bladder cancer, might be served as a target in cancer therapies in the future.