LncRNA BACE1-AS enhances the invasive and metastatic capacity of hepatocellular carcinoma cells through mediating miR-377-3p/CELF1 axis

Aims: Hepatocellular carcinoma (HCC) is a malignant cancer that threatened human life seriously. Long non-coding RNA (lncRNA) BACE1-AS has been reported as a key regulator in tumorigenesis. Yet the specific corre-lation between BACE1-AS and HCC still needs further investigation. The primary purpose of our study is to reveal the exact correlation between BACE1-AS and HCC.Main methods: Bioinformatics via TCGA database revealed BACE1-AS closely related with HCC. qRT-PCR confirmed the abnormal BACE1-AS level in HCC tissues and cells. Databases prediction suggested that miR-377-3p might be a modulatory target of BACE1-AS and luciferase assay confirmed this hypothesis. Further study discovered that CELF1 also partook in the regulatory axis of BACE1-AS/miR-377-3p. Wound healing assays and transwell assays were utilized to investigate the impact of BACE1-AS, miR-377-3p and CELF1 in vitro. In vivo metastasis was examined by pulmonary metastasis model.Key findings: This study found that BACE1-AS was overexpressed in HCC tissues and cell lines. Knockdown of BACE1-AS could restrain HCC progression in vitro, and inhibit pulmonary metastasis in vivo. MiR-377-3p was negatively modulated by BACE1-AS in HCC tumor tissues and cells. MiR-377-3p up-regulation inhibited HCC cells migration and invasion via inactivating EMT process. Moreover, CELF1 was identified as a downstream regulator of miR-377-3p and served as an oncogene in HCC cells.Significance: Our findings supported that lncRNA BACE1-AS was up-regulated in HCC, promoting invasion and metastasis of hepatocellular carcinoma cells by modulating miR-377-3p/CELF1 axis via contributing to EMT pathway. BACE1-AS could be a potential biomarker in HCC for future treatment.