Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang, 150081, China.
Department of Hepatobiliary and Pancreas, Heilongjiang Cancer Hospital, Harbin, China.
J Exp Clin Cancer Res. 2018 Mar 5;37(1):46. doi: 10.1186/s13046-018-0699-1.
Cell adhesion molecules (CADMs) comprise of a protein family whose functions include maintenance of cell polarity and tumor suppression. Hypo-expression of CADM2 gene expression has been observed in several cancers including hepatocellular carcinoma (HCC). However, the role and mechanisms of CADM2 in HCC remain unclear.
The expression of CADM2 and miRNA-10b (miR-10b) in HCC tissues and cell lines were detected using real-time PCR and Western blotting. Immunofluorescence was used to detect Epithelial-mesenchymal transition (EMT) progression in HCC cell lines. Dual-luciferase reporter assay was used to determine miR-10b binding to CADM2 3'UTR. Wound healing assay and Transwell assay were performed to examine the migration and invasion of HCC cells.
We report the effect of CADM2 as a tumor suppressor in HCC. Firstly, we confirmed that CADM2 expression was significantly down regulated in HCC tissues compared to normal tissues according to TCGA data analysis and fresh HCC sample detection. Secondly, overexpression of CADM2 could inhibit EMT process, migratory and invasion ability of HCC cells. Furthermore, the results indicated that CADM2 is a direct target of miR-10b in HCC cells and miR-10b/CADM2 modulates EMT process and migration ability via focal adhesion kinase (FAK) /AKT signaling pathway in HCC.
Our study demonstrates that miR-10b-CADM2-FAK/AKT axis plays an important role in HCC metastasis, which might be a novel potential therapeutic option for HCC treatment.
细胞黏附分子（CADMs）是一个蛋白质家族，其功能包括维持细胞极性和抑制肿瘤。在包括肝细胞癌（HCC）在内的几种癌症中，已经观察到 CADM2 基因表达的低表达。然而，CADM2 在 HCC 中的作用和机制尚不清楚。
使用实时 PCR 和 Western blot 检测 HCC 组织和细胞系中 CADM2 和 miRNA-10b（miR-10b）的表达。免疫荧光检测 HCC 细胞系中上皮-间充质转化（EMT）的进展。双荧光素酶报告基因检测用于确定 miR-10b 与 CADM2 3'UTR 的结合。划痕愈合实验和 Transwell 实验用于检测 HCC 细胞的迁移和侵袭。
我们报告了 CADM2 作为 HCC 肿瘤抑制因子的作用。首先，根据 TCGA 数据分析和新鲜 HCC 样本检测，我们证实 CADM2 表达在 HCC 组织中明显低于正常组织。其次，CADM2 的过表达可以抑制 EMT 过程、HCC 细胞的迁移和侵袭能力。此外，结果表明 CADM2 是 HCC 细胞中 miR-10b 的直接靶标，miR-10b/CADM2 通过 HCC 中的粘着斑激酶（FAK）/AKT 信号通路调节 EMT 过程和迁移能力。
我们的研究表明，miR-10b-CADM2-FAK/AKT 轴在 HCC 转移中发挥重要作用，这可能是 HCC 治疗的一种新的潜在治疗选择。
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