中文摘要：

目的：检测BMP4在肝癌中的表达并探讨BMP4在诱导肝癌EMT中的作用,进而研究其对肝癌细胞迁移侵袭能力的影响。方法：采用免疫组织化学方法检测肝癌组织中BMP4的表达,分析其与肝癌临床病理资料之间的关系。将BMP4表达质粒转染至肝癌细胞系Hep G2中,诱导BMP4外源性过表达。观察BMP4转染前、后Hep G2的细胞形态学改变;Western blot检测转染前、后Hep G2中BMP4、EMT相关蛋白（E-cadherin、Vimentin）表达变化情况;划痕和侵袭实验检测BMP4对细胞迁移侵袭能力的影响。结果：BMP4与患者的年龄、病理分级、临床分期、不良预后密切相关。BMP4过表达后Hep G2呈现典型的EMT形态学改变,E-cadherin表达下调、Vimentin表达上调、细胞的迁移侵袭能力显著增强。结论：BMP4与肝癌临床病理资料密切相关,并可能通过诱导EMT促进肝癌细胞的迁移侵袭能力。

英文摘要：

Objective：To determine the expression of BMP4 in hepatocellular carcinoma （HCC） and to study the role of BMP4 in inducing epithelial-mesenchymal transition （EMT） to analyze the effect of BMP4 on the migration and invasion of HCC cells. Methods： The expression of BMP4 in HCC specimens was examined by immunohistochemistry staining, and the correlations were analyzed between the expression of BMP4 and clinicopathological data. The BMP4 expression plasmid was transfected into HepG2 cells to induce exogenous overexpression of BMP4 protein. The changes of HepG2 cell morphology were detected after BMP4 transfection by using a microscope; the changes of the expression of BMP4, EMT-related protein （E-cadherin, Vimentin） in HepG2 cells were detected by Western blot after transfection of BMP4;the wound healing assay in vitro was used to detect the effects of BMP4 gene transfection on the ability of migration of HepG2 cells;the invasion assay was used to determine the role of transfection of BMP4 on the invasive potential of HepG2 cells. Results： Immunohistochemistry staining method displayed that BMP4 expression was positively associated with age, histological differentiation, stage, and poor prognosis. After BMP4 overexpression, the morphology of HepG2 cells showed significant changes from a paving stone structure with cell-cell adhesion to a fibroblastic shape, which showed typical EMT change; Western blot exhibited that the expression of E-cadherin was downregulated and the Vimentin expression was upregulated in HepG2 cells;the wound healing and invasion assay showed that the migration and invasion potentials of HepG2 cells were significantly enhanced. Conclusion： BMP4, which displayed a high expression in HCC specimens, was closely associated with clinicopathologic data, and BMP4 may promote migration and invasion of HCC cells by inducing epithelial-mesenchymal transition.