P-Glycoprotein-mediated multidrug resistance is a frequent event during chemotherapy and a key obstacle for bladder cancer therapy. Search for strategies to reverse multidrug resistance is a promising approach to improve the management of bladder cancer. In the present study, we reported a novel P-glycoprotein-mediated multidrug resistant cell model 253J/DOX, which was generated from human bladder cancer 253J cell line. Furthermore, we found that the multidrug resistant phenotype of 253J/DOX cells could be overcome by sinomenine, an alkaloid derived from the stem of Sinomenium acutum. Mechanistically, the chemosensitive effect by sinomenine was mediated by down-regulating P-glycoprotein expression, as well as triggering apoptotic pathways. The chemosensitive effect of sinomenine may make it a prime candidate agent to target bladder cancer.
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