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Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is an effective chemotherapeutic agent that specifically impairs cancer cells while sparing normal cells; however, some cancer cells develop resistance to TRAIL. Here, we identified Andrographolide, a diterpenoid lactone derived from a traditional herbal medicine Andrographis paniculata , as an ideal sensitizer for TRAIL to overcome bladder cancer. Our results showed that combination treatment of Andro and TRAIL retarded growth, attenuated proliferation, decreased colony formation, inhibited migration and promoted caspases-mediated apoptosis in T24 cells. Additionally, the sensitization by Andro is achieved through up-regulation of death receptors (DR4 and DR5) of TRAIL in a p53 -dependent manner. Crucially, Andro is also capable of inactivating NF-κB signaling pathway via transcriptional down-regulation p65/RelA, which is further contributed to enhancement of TRAIL-mediated cytotoxicity. These results indicated that non-toxic doses of Andrographolide sensitized bladder cancer cells to TRAIL-mediated apoptosis, suggesting it as an effective therapeutic agent for TRAIL resistant human bladder cancers.

international journal of biological sciences

Andrographolide Enhances TRAIL-Induced Apoptosis via <i>p53</i>-Mediated Death Receptors Up-Regulation and Suppression of the NF-кB Pathway in Bladder Cancer Cells

Andrographolide Enhances TRAIL-Induced Apoptosis via p53-Mediated Death Receptors Up-Regulation and Suppression of the NF-кB Pathway in Bladder Cancer Cells