SOX12 promotes the growth of multiple myeloma cells by enhancing Wnt/β-catenin signaling.

SRY-related high-mobility-group box 12 (SOX12) has currently emerged as a key cancer-related protein in multiple human cancer types. However, little is known about the relevance of SOX12 in multiple myeloma (MM). The current study aimed to investigate the potential role of SOX12 in MM. Our results demonstrated that SOX12 expression was markedly elevated in MM cell lines. A series of cellular assays demonstrated that SOX12 knockdown significantly reduced the proliferation and colony formation, and upregulated cell apoptosis of MM cells. By contrast, SOX12 overexpression promoted the proliferation, colony formation and decreased the apoptosis of MM cells, results that reveal its oncogenic effects. SOX12 regulated β-catenin expression and TCF/LEF transcriptional activity. Moreover, the SOX12-knockdown-mediated antitumor effect in MM cells was significantly reversed by transfecting a β-catenin expression vector. Notably, SOX12 inhibition retarded tumor growth in vivo of a MM-derived mouse xenograft model. In conclusion, our results suggest a potential oncogenic function for SOX12 in MM. Our findings reveal that SOX12 knockdown inhibits the growth of MM cells by downregulating the Wnt/β-catenin signaling pathway, results that imply SOX12 may represent a novel therapeutic target for MM treatment.