Abstract
BackgroundLong noncoding RNAs (lncRNAs) have been proved to play important roles in the tumorigenesis and development of human hepatocellular carcinoma (HCC). The aim of our study is to investigate the expression and function of BRAF-activated noncoding RNA (BANCR) in HCC.MethodsBANCR expression was detected in HCC tissues and cell lines by using quantitative real-time PCR (qRT-PCR). Association between BANCR levels and clinicopathological factors and patient prognosis was also analyzed. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT), flow cytometry, and transwell invasion and migration assays were used to investigate the role of BANCR in the regulation of biological behaviors of HCC cells.ResultsBANCR expression was remarkably increased in HCC tissues compared with adjacent noncancerous tissues (P < 0.001). BANCR expression in four HCC cell lines was also significantly upregulated (P < 0.05). Clinicopathologic analysis revealed that high BANCR expression correlated with high tumor grade, large tumor size, venous infiltration, advanced tumor, node, and metastasis (TNM) stage, and shorter overall survival. Multivariate regression analysis identified BANCR overexpression as an independent unfavorable prognostic factor (relative risk [RR] 4.245; P = 0.015) in HCC patients. Moreover, BANCR downregulation in Hep3B cells impaired cell proliferation, promoted cell apoptosis, reduced cell invasion and migration, led to downregulated vimentin, and upregulated E-cadherin protein levels.ConclusionsThese findings suggested that BANCR may contribute to HCC initiation and progression and would be used as not only a novel prognostic marker but also a potential therapeutic target for this disease.
Highlights
Long noncoding RNAs have been proved to play important roles in the tumorigenesis and development of human hepatocellular carcinoma (HCC)
Increased BRAF-activated noncoding RNA (BANCR) expression in HCC tissues and cell lines BANCR expression in HCC tissues and cell lines was measured by quantitative real-time PCR (qRT-PCR)
Association between clinicopathological characteristics and BANCR expression in HCC patients We further analyzed the association between BANCR expression and clinicopathological characteristics of HCC
Summary
Long noncoding RNAs (lncRNAs) have been proved to play important roles in the tumorigenesis and development of human hepatocellular carcinoma (HCC). The aim of our study is to investigate the expression and function of BRAF-activated noncoding RNA (BANCR) in HCC. Despite recent advances in clinical and experimental oncology, the long-term prognosis of HCC patients remains poor, due to late detection of disease, frequent cancer metastasis, high recurrence rate, and lack of effective therapeutic intervention for terminally staged tumors. Long noncoding RNA (lncRNA), >200 nucleotides in length, is a type of noncoding RNA molecule that can regulate gene expression in transcriptional or posttranscriptional level [4, 5]. The understanding of the expression and function of lncRNAs in HCC is still in the early stage
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