Calcium-binding protein 39 promotes hepatocellular carcinoma growth and metastasis by activating extracellular signal-regulated kinase signaling pathway

Abstract

Calcium binding protein (CAB39) is a key regulator of a group of STE20 kinases. Here we report that CAB39 was frequently up-regulated in hepatocellular carcinoma (HCC), which was significantly associated with tumor metastasis (P=0.000), poorer diseasefree survival rate (P=0.027) and poor prognosis (P=0.000). Ectopic expression of CAB39 in immortalized human liver cell line LO2 and HCC cell lines QGY-7703 and BEL-7402 could increase foci formation, colony formation in soft agar, tumor formation in nude mice and cell motility. Silencing CAB39 expression in two HCC cell lines Huh7 and MHCC97H with short hairpin RNA could effectively abolish its oncogenic function. Further study found that CAB39 contributed to the ERK pathway activation and mutations of the key sites of CAB39 markedly decrease the level of the phosphorylated ERK. In addition, CAB39 could promote epithelial-mesenchymal transition (EMT) by up-regulating N-cadherin and Fibronectin, and down-regulating Ecadherin and α-E-catenin. As a result, β-catenin nuclear translocation was increased and its downstream target gene MMP-9 was up-regulated. Taken together, our findings suggested that CAB39 play very important oncogenic roles in HCC pathogenesis and progression by activating ERK signaling pathway. Better understanding of CAB39 may lead to its clinical application as a biomarker for prognosis predictor and a novel therapeutic target.