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Background:   Prostate cancer is the most commonly diagnosed cancer and second leading cause of cancer death in men. Enoxacin, a third-generation fluoroquinolone antibiotic, was found with anti-proliferative effects against many cancer types. This study was to further investigate its effects against prostate cancer and explore the underlying molecular mechanisms.Methods:   PC-3 cells were treated with Enoxacin at different concentrations. Tumor model was established by subcutaneously injecting PC-3 cells into nude mice. MTT assay was used to detect cell viability. ELISA assay, Annexin V/PI staining and TUNEL assay were used to detect apoptosis. RT-qPCR and western blot were used to detect the gene and protein expression, respectively.Results:   Our data showed that Enoxacin inhibited PC-3 cell proliferation and induced the apoptosis through up-regulating the expression of pro-apoptotic proteins, while down-regulating expression levels of anti-apoptotic proteins. Moreover, Enoxacin increased the gene and protein expression of the autophagy and endoplasmic reticulum stress markers. Treating tumor-bearing mice with Enoxacin significantly inhibited tumor growth in xenograft tumor model.Conclusion:   Our results suggested that Enoxacin could be developed as a potential anti-tumor agent against prostate carcinoma.

Enoxacin Exerts Anti-Tumor Effects Against Prostate Cancer Through Inducing Apoptosis