滑膜肉瘤X断点基因在原发性肝癌中的表达及意义

The expression and significance of SSX gene in primary liver carcinoma

目的 检测原发性肝癌（HCC）中滑膜肉瘤X断点基因（SSX基因）的表达及其与临床指标的相关性.方法 实时PCR检测SSX1-SSX5 mRNA的表达;蛋白印迹和免疫组化检测SSX1蛋白表达;分析SSX mRNA表达和SSX1蛋白表达与临床指标的相关性.结果 在肝癌细胞株BEL-7404、Hep G2、SMMC-7721,检测到SSX1、SSX2、SSX3 mRNA表达.在26例HCC组织SSX1、SSX2、SSX3、SSX4、SSX5 mRNA水平均有表达,表达率分别为53.8％、42.3％、50.0％、46.2％、26.9％.SSX1 mRNA的表达与AFP水平无关（P＞0.05）,在正常值组及高值组均有较高的表达率,高龄组的表达率（85.7％）高于低龄组（16.7％,P＜0.05）.在肝癌组织SSX1蛋白的表达率为50％,癌旁及肝硬化组织中均无表达.49例HCC石蜡组织切片检测：SSX1蛋白的表达率（46.9％）高于配对癌旁组织的表达率（18.4％,P＜0.05）.SSX1蛋白在大肝癌组的表达率（68.3％）高于小肝癌组（29.6％,P＜0.05）.结论 SSX1 mRNA基因在HCC中呈高比例、高特异表达,为HCC免疫治疗提供了新的理想靶位.SSX1表达检测对HCC的辅助诊断具有潜在价值.

Objective To detect the expression of SSX and to correlate it with clinical indicators of primary hepatocellular carcinoma （HCC）.Methods The expression of SSX1-5 mRNA and SSX1 protein were respectively detected by RT-PCR and Western blot and immunohistochemistry staining.The relation between the expression of SSX mRNA and SSX1 protein with clinical indicators were analysed.Results SSX1,SSX2,and SSX3 mRNA were expressed in hepatocellular carcinoma cell lines BEL-7404,Hep G2,and SMMC-7721.In 26 HCC samples,SSX1-SSX5 mRNA was detectable in 53.8%,42.3%,50.0%,46.2% and 26.9%.The expression of SSX1 mRNA was not related to serum AFP levels （P 〉0.05）.Specific expression was both found in the normal group and the high value group.The expression rate of SSX1 mRNA was 85.7% in the older group,which was higher than in the younger group （16.7%,P 〈 0.05）.The expression rate of SSX1 protein was 50% in HCC tissues,which was not seen in the caner-adjacent or cirrhosis tissues.In 49 HCC paraffin tissue section samples,the expression rate of SSX1 protein was higher than that in caner-adjacent tissues （46.9% vs 18.4%,P 〈 0.05）.The expression rate of SSX1 protein was 68.3% in the large hepatocellular carcinoma group,which was higher than in the small hepatocellular carcinoma group （29.6%）,（P 〈 0.05）.Conclusions SSX1 mRNA is expressed with a high percentage and specificity in HCC and their products are new potential promising targets for antigen-specific immunotherapy of HCC.The detection of SSX1 expression has the potential value for auxiliary diagnosis of HCC.