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• W2783271434 abstract "Background/Aims: Chloroquine was formerly used as an anti-malarial agent drug but has now been proven to be useful for various diseases. This study aimed to investigate the radiosensitizing effect of chloroquine in bladder cancer, with an emphasis on autophagy inhibition and apoptosis induction. Methods: Bladder cancer cell lines were irradiated with or without chloroquine. Cell proliferation was determined by a Cell Counting Kit 8 assay. The radiosensitization effect of chloroquine was evaluated by clonogenic survival and progression of xenograft tumors. Cell apoptosis was detected by flow cytometry and western blot. Radiation-induced DNA double strand break was measured by the staining of γ-H2AX. In addition, autophagy was detected by western blot, immunofluorescence staining, and electron microscopy. Results: The treatment with chloroquine alone inhibited the proliferation of bladder cancer cells in a dose-dependent manner. Low cytotoxic concentrations of chloroquine enhanced the radiation sensitivity of bladder cancer cells with a sensitization enhancement ratio of 1.53 and 1.40. Chloroquine also obviously weakened the repair of radiation-induced DNA damage. A combination of radiation and chloroquine enhanced the apoptosis rate of EJ and T24 cells and down-regulated the expression of Bcl-2 while up-regulating the expression of caspase-3. Additionally, the relevant markers of autophagy were obviously increased in the combined group, meaning that chloroquine inhibited autophagy induced by irradiation. Furthermore, subcutaneous xenograft tumors displayed that the combination of radiation and chloroquine could impede tumorigenesis in vivo. Conclusion: In summary, these results provided support that by inhibiting autophagy and activating apoptosis, chloroquine might be a potentially promising radiosensitizer in the radiation therapy of bladder cancer." @default.
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• W2783271434 date "2017-12-22" @default.
• W2783271434 modified "2023-10-16" @default.
• W2783271434 title "Chloroquine Enhances the Radiosensitivity of Bladder Cancer Cells by Inhibiting Autophagy and Activating Apoptosis" @default.
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• W2783271434 doi "https://doi.org/10.1159/000486222" @default.
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