[Experimental study of miRNA200a regulating Wnt/β-catenin signaling pathway in silica-induced mouse lung epithelial cells].
Objective: To observe the effect of overexpression of miRNA200a (miR-200a) recombinant lentivirus on the expression of Wnt/β-catenin signaling pathway in mouse lung epithelial cell line MLE-12 induced by silica (SiO(2)) . Methods: The mice were divided into SiO(2) control group (SiO(2)) , virus control group (SiO(2)+Lv-NC) group and overexpressing miR-200a virus group (SiO(2)+Lv-miR-200a). The expression of β-catenin, MMP2, MMP9, TCF-4 and Cyclin D1 mRNA and protein were detected by realtime-PCR and western blot after incubating cells for 18 h stimulating at the final concentration of 200 μg/ml of SiO(2). Results: The expression of miR-200a in MLE-12 cells of SiO(2)+Lv-miR-200 a group was significantly higher than that in SiO(2) group and SiO(2)+Lv-NC group. The mRNA and protein expression of β-catenin, MMP2, MMP9, TCF-4 and Cyclin D1 in MLE-12 cells of SiO(2)+Lv-miR-200a group were significantly lower than those in SiO(2) group and SiO(2)+Lv-NC group (P<0.05) . Conclusion: Overexpression of miR-200a can inhibit the expression of related genes of Wnt/β-catenin signaling pathway in silica-induced mouse lung epithelial cells.