What's known on the subject? and What does the study add? So far, transcription factor Twist1 has been reported to regulate Y-box binding protein-1 (YB-1) expression and play important roles in tumour growth, invasion and drug resistance. This study revealed that in bladder cancer cells, Twist1 regulated YB-1 transcription and both Twist1 and YB-1 promote malignant potentials including tumour growth, invasion and anticancer-drug resistance. Although the relation between Twist1/YB-1 signaling and cancer malignant potentials including tumour growth, invasion and anticancer-drug resistance have been suggested, their roles in bladder cancer remain unknown. This study revealed their functional importance in bladder cancer, indicating that both Twist1 and YB-1 are promising molecular targets in bladder cancer. Objective: To investigate the roles of Twist1 and Y-box binding protein-1 (YB-1) and their potential as therapeutic targets in bladder cancer (BC), as both have been suggested to play important roles in tumour growth, invasion and drug resistance. Materials and methods: Bladder cancer cell lines (TCCsup, UMUC3, T24 and KK47 cells) were used. Twist1 and YB-1 expression levels were assessed by luciferase reporter assay, quantitative real-time polymerase chain reaction (PCR) and western blot analysis. Tumour growth and cell cycle were analysed by cell proliferation assay and flow cytometry, respectively. Invasive and motile abilities were investigated by scratch-wound test and migration assay, respectively. Cytotoxicity assay was performed to determine drug sensitivity. Results: The findings showed that Twist1 regulated YB-1 expression in BC cells. Both Twist1 and YB-1 were involved in cell growth, invasion, motility and resistance to cisplatin and doxorubicin, but not to 5-fluorouracil (5-FU). Conclusion: The present study showed that Twist1 regulates YB-1 expression and that both Twist1 and YB-1 promote malignant potentials, including tumour growth, invasion and anti-cancer-drug resistance, indicating that both Twist1 and YB-1 are novel molecular targets in BC.
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