MiR-144-3p inhibits the proliferation and metastasis of pediatric Wilms' tumor cells by regulating Girdin.

Objective: The aim of this study was to investigate the role of miR-144-3p in the proliferation and metastasis capacity of pediatric Wilms' tumor (WT) cells and to explore the underlying mechanism.

Patients And Methods: The quantitative Reverse Transcription-Polymerase Chain Reaction (qRT-PCR) was performed to measure the expression level of miR-144-3p in pediatric WT tissues and cell lines (G401). A bioinformatics software was utilized to predict the interaction between miR-144-3p and Girdin. Subsequently, the interaction was further verified by dual luciferase reporter (DLR) gene assay and Western blot. The proliferation and colony formation ability of G401 cells were examined by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) and colony formation assay, respectively. Finally, the effect of miR-144-3p on cell invasion and migration was analyzed by transwell assay.

Results: In the current study, we found that the expression level of miR-144-3p was significantly reduced in pediatric WT tissues and cells, whereas Girdin expression was upregulated. On-line target gene prediction software was applied to screen Girdin, which was considered as a downstream target gene of miR-144-3p. The interaction between miR-144-3p and Girdin was further verified by dual Luciferase reporter gene assay and Western blot. Subsequent experiments demonstrated that the proliferation and metastasis ability of cells was remarkably suppressed after up-regulating the expression of miR-144-3p. However, an addition of Girdin could reverse the effect of miR-144-3p.

Conclusions: MiR-144-3p, which was up-regulated in pediatric WT, might inhibit the proliferation and metastasis of the cells by directly targeting Girdin. This further indicated that miR-144-3p could be a potential therapeutic target for the treatment of pediatric WT.