O-GlcNAc转移酶在肝细胞癌组织中的表达及其临床意义

目的：探讨氧连氮-乙酰葡萄糖胺转移酶（OGT）在原发性肝细胞癌（HCC）组织、细胞及血清中表达情况，阐明OGT在HCC的诊断和治疗中的意义。方法：采用Western blotting法分别检测20例HCC组织和癌旁组织中以及8例肝癌细胞株和正常人肝细胞裂解物中OGT蛋白表达水平，采用直接酶联免疫吸附测定法（ELISA）检测20名健康志愿者、肝硬化（LC）、HCC患者血清中OGT蛋白表达水平，分析HCC组织、细胞、血清中OGT蛋白表达水平与肿瘤发生发展的关系。结果：Western blotting检测，OGT在HCC肿瘤组织及相对应癌旁组织中均有表达，HCC患者肿瘤组织中OGT阳性表达率高于相对应癌旁组织（P < 0.05）；同时OGT在肝细胞癌株及正常人肝细胞裂解物中均有表达，而肝细胞癌株中阳性表达率高于正常人肝细胞裂解物（P < 0.05）。ELISA法检测，HCC和LC患者血清中OGT表达水平均高于健康志愿者（P < 0.05）。结论：OGT在HCC肿瘤组织中表达升高，OGT有望成为HCC新的诊断靶点。

Expression of O-GlcNAc transferase in hepatocellular carcinoma tissue and its clinical significance

Objective:To investigate the expressions of O-GlcNAc transferase (OGT) in the hepatocellular carcinoma (HCC) tissue,cells and serum,and to clarify the significance of OGT in diagnosis and treatment of HCC.Methods:Western blotting method was used to detect the expression levels of OGT in 20 samples of HCC tissue and matched non-tumor tissue,8 hepatoma cell lines and normal liver (human) cell lysate.The expression levels of serum OGT were detected by direct ELISA in 20 liver cirrhosis (LC) patients,20 HCC patients and 20 healthy volunteers.The relationship between the expression levels of protein in HCC tissue,cells and serum and the occurrence and development of tumor were analyzed.Results:The Western blotting results showed there were expressions of OGT in both HCC tissue and matched non-tumor tissue;The positive expression rate of OGT in HCC tissue was significantly higher than that in non-tumor tissue (P＜0.05).There were expressions of OGT in both hepatoma cell lines and normal liver (human) cell lysate;the positive expression rate of OGT in HCC cell lysate was significantly higher than that in the normal liver cell lysate (P＜0.05).The result of direct ELISA showed that the serum OGT levels of the LC and HCC patients were equally higher than that of the healthy volunteers (P＜0.05).Conclusion:OGT highly expresses in HCC tissue and OGT is a promising biomarker for the diagnosis of HCC.