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YKL-40 promotes the migration and invasion of prostate cancer cells by regulating epithelial mesenchymal transition.

OBJECTIVE: This study aims to observe the expression of YKL-40 in prostate cancer and whether YKL-40 can affect the migration and invasion of tumor cells by regulating epithelial mesenchymal transition.

METHODS: We collected 14 cases of prostate cancer tissues and adjacent tissues in this study. The expression levels of YKL-40 in the tissues were analyzed by western blotting and immunohistochemical methods. The expression of YKL-40 in human prostate cancer cell line DU145 and PC3 was detected by fluorescence quantitative PCR and western blotting methods. The expression levels of YKL-40 in different cells were up-regulated or down- regulated by lentivirus to observe the changes of cell migration and invasion. The expression levels of EMT related genes were analyzed by RT-PCR and Western blotting methods.

RESULTS: The expression level of YKL-40 in prostate cancer tissues was significantly higher than that in adjacent tissues (P<0.01), and it was higher in DU145 cells than that in PC3 cells (P<0.05). The expression level of YKL-40 was positively correlated with cell migration and invasion. YKL-40 can regulate the expression of EMT related genes (Twist, Snail, Slug, N-cadherin, Vimentin and E-cadherin).

CONCLUSIONS: The expression level of YKL-40 was positively correlated with the migration and invasion of prostate cells, it affects cancer metastasis by regulating EMT.

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