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[The MicroRNA miR-205 inhibits epithelial-messenchymal transition in HK-2 cells by down-regulating ZEB1 and ZEB2 expressions].

OBJECTIVE: To explore the role of miR-205 in regulating epithelial-messenchymal transition (EMT) in proximal tubular cell line HK-2 cells and the underlying mechanism.

METHODS: HK-2 cells transfected with miR-205 mimics or a scrambled control sequence were examined for miR-205 expressions and mRNA levels of ZEB1, E-cadherin, and α-SMA using real-time qPCR; the protein levels of ZEB1, ZEB2, E-cadherin, and α-SMA were detected with Western blotting. Immunohistochemistry was performed to examine the ectopic expression of β-catenin and E-cadherin expression in the cells.

RESULTS: The expression levels of ZEB1 and ZEB2 decreased significantly (P<0.01) while E-cadherin expression was up-regulated (P<0.01) in cells transfected with miR-205 mimics. Transfection with miR-205 mimics also markedly down-regulated the expression of α-SMA (P<0.01), a marker of mesenchymal cells that play an important role in EMT of HK-2 cells. The ectopic expression of β-catenin was inhibited by miR-205 mimics in HK-2 cells.

CONCLUSION: miR-205 inhibits EMT in HK-2 cells by down-regulating the expression levels of ZEB1 and ZEB2.

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