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BIX-01294, an euchromatic histone-lysine N-methyltransferase 2 (EHMT2) inhibitor, has been reported to induce apoptosis in human neuroblastoma cells and inhibit the proliferation of bladder cancer cells. However, the definite mechanism of the apoptosis mediated by BIX-01294 in bladder cancer cells remains unclear. In the present study, we found that BIX-01294 induced caspase-dependent apoptosis in human bladder cancer cells. Moreover, our data show BIX-01294 stimulates endoplasmic reticulum stress (ER stress) and up-regulated expression of PMAIP1 through DDIT3 up-regulation. Furthermore, down-regulation of the deubiquitinase USP9X by BIX-01294 results in downstream reduction of MCL1 expression, leading to apoptosis eventually. Thus, our findings demonstrate PMAIP1-USP9X-MCL1 axis may contribute to BIX-01294-induced apoptosis in human bladder cancer cells.

EHMT2 inhibitor BIX-01294 induces apoptosis through PMAIP1-USP9X-MCL1 axis in human bladder cancer cells