项目名称: ST6Gal-I介导细胞表面N-聚糖唾液酸化在肝癌发生发展和免疫逃逸中的作用及机制研究
项目编号: No.31470799
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 生物科学
项目作者: 汪淑晶
作者单位: 大连医科大学
项目金额: 80万元
中文摘要: ST6Gal-I在肝癌组织中高表达,但它在肝癌中的具体作用迄今尚未完全阐明,严重限制其作为肝癌治疗靶点的研究。申请者前期发现(青年基金),ST6Gal-I表达水平与肝癌细胞恶性程度呈正相关;ST6Gal-I过表达可促进肝癌细胞与细胞外基质粘附能力;ST6Gal-I可上调Fas蛋白的唾液酸化水平。提示:ST6Gal-I在肝癌中可能发挥促癌作用,并参与肿瘤免疫逃逸。本课题拟在前期工作基础上,构建小鼠肝癌动物模型,结合细胞实验,全面分析ST6Gal-I表达变化对肝癌发生发展及相关信号通路的影响;考察ST6Gal-I表达不同的肝癌细胞与免疫细胞之间的相互作用;探讨ST6Gal-I是否通过调控Fas蛋白唾液酸化参与肝癌免疫逃逸。该研究旨在明确ST6Gal-I介导细胞表面N-聚糖唾液酸化在肝癌发生、发展和免疫逃逸中的促进作用,阐明其分子机制,找到关键分子,为寻求肝癌诊断和治疗较理想的靶点提供理论基础。
中文关键词: 唾液酸转移酶;ɑ2;6-唾液酸;肝癌;肿瘤转移;肿瘤免疫逃逸
英文摘要: It was reported that ST6Gal-I was highly expressed in hepatoma tissues compared with normal liver tissues. However, the role of ST6Gal-I in hepatoma remains poorly understood. In previous study, we found that ST6Gal-I expression levels were positively correlated with the malignant phenotypes of hepatoma cells. Overexpression of ST6Gal-I promoted the adhesive ability of hepatoma cells to FN, and upregulated the sialylation of Fas. This indicated that ST6Gal-I might play an important role in promoting tumorigenesis, development and immune escape. In this study, we will further study the detailed functions of ST6Gal-I in hepatoma and the possible mechanisms involving in tumor immune escape both in vitro and in vivo. This study will provide the theoretic evidences for identifying the ideal molecular targets for the diagnosis and treatment of hepatoma.
英文关键词: ST6Gal-I;ɑ2;6-sialic acid;hepatoma;metastasis;immune escape