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Effects of Concurrent Chemoradiotherapy on the Metastasis and the Mesenchymal Transition of Bladder Urothelial Carcinoma Cells
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Effects of Concurrent Chemoradiotherapy on the Metastasis and the Mesenchymal Transition of Bladder Urothelial Carcinoma Cells
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Effects of Concurrent Chemoradiotherapy on the Metastasis and the Mesenchymal Transition of Bladder Urothelial Carcinoma Cells
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Journal Article
Effects of Concurrent Chemoradiotherapy on the Metastasis and the Mesenchymal Transition of Bladder Urothelial Carcinoma Cells
2021
Overview
Background/Aim: Cancer stem cells (CSCs) have been suggested playing a crucial role in the tumorigenesis and tumor progression. Clinically, concurrent chemoradiotherapy (CCRT) after transurethral resection of the bladder is the widely accepted treatment option for high-grade bladder urothelial carcinoma (UC); however, a proportion of bladder UC patients still suffer from recurrence and metastasis. In the present study, we investigated the stemness properties of bladder UC cells with respect to various disease stages. The metastatic capability and epithelial–mesenchymal transition (EMT) of the parental cells and the CSC cells of bladder UC, after chemotherapy with cisplatin alone or CCRT were also studied, respectively. Materials and Methods: The aldehyde dehydrogenase (ALDH)-positive cells were analyzed by a flow cytometer. The inhibitory effects of radiation in combination with cisplatin on the cell viability, migration, invasion and EMT characteristics were also examined. Results: We found that the proportion of ALDH+-CSCs of bladder UC cells and the disease grading were independent. Furthermore, cisplatin alone significantly (p<0.05) enhanced the migration of both grade-III T24 cells and advanced-stage HT1197 cells, while CCRT treatment significantly (p<0.05) inhibited the T24 cell migration capability, compared to the cisplatin alone group. Interestingly, we found that the cell invasion capability was obviously increased upon the treatment with CCRT in both T24 and HT1197 CSCs. Furthermore, cisplatin played a promoting role in EMT whether in the presence or absence of irradiation. Conclusion: CSCs as well as EMT signaling might contribute to the resistance and metastasis of one-shot CCRT in malignant bladder cancer.
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