TRIM50 Inhibits Proliferation and Metastasis of Gastric Cancer via Promoting beta-Catenin Degradation

Background. Gastric cancer (GC) is a common malignancy with a poor prognosis. Tripartite motif-containing 50 (TRIM50) belongs to the TRIM family and is reported to be related to numerous cancers. This study aimed to investigate the function of TRIM50 in GC. Methods. Three microarray datasets (GSE13911, GSE79973, and GSE19826) containing GC and adjacent nontumor tissues were used for bioinformatics analysis to screen GC-related genes and assess the associations between GC development and TRIM50 expression. Then, TRIM50 expression in GC cells was detected at mRNA and protein levels. After TRIM50 was knockdown or overexpressed, the effect of TRIM50 on the proliferation and metastasis of GC cells was analyzed using Cell Counting Kit-8 (CCK-8), flow cytometry, scratch, and Transwell assays. The interaction between TRIM50 and beta-catenin was analyzed. The expression of cell cycle-, migration-, invasion-, and Wnt/beta-catenin signaling pathway-related proteins was detected by Western blot. Furthermore, we measured the role of TRIM50 overexpression on tumor growth as well as the Wnt/beta-catenin signaling pathway in vivo. In addition, XAV939 (a WNT/beta-catenin signaling pathway inhibitor) was used to clarify the mechanism of TRIM50 on GC. Results. Bioinformatics revealed that TRIM50 expression was decreased in GC samples and associated with GC development. In vitro study revealed that TRIM50 overexpression impeded the GC cell proliferation and metastasis, while TRIM50 knockdown presented the opposite results. In addition, TRIM50 interacted with beta-catenin to induce the degradation of beta-catenin. In in vivo assay, TRIM50 overexpression inhibited tumor growth and blocked the Wnt/beta-catenin signaling pathway. In addition, TRIM50 knockdown-promoted cell proliferation and metastasis in GC cells were inverted by XAV939. Conclusion. TRIM50 overexpression may inhibit cell proliferation and metastasis in GC via beta-catenin degradation, indicating that TRIM50 could be a target for the treatment of GC.