PeroxiredoxinⅠ蛋白在肝癌门静脉癌栓组织中的表达及其临床意义

目的 探讨抗氧化还原蛋白1(PeroxiredoxinⅠ,PrxⅠ)在肝细胞癌合并门静脉癌栓组织中的表达及其与肝癌门静脉癌栓患者术后复发的关系.方法 应用免疫组化法和蛋白印迹法检测40例肝细胞癌合并门静脉癌栓组织中PrxⅠ蛋白的表达.于大鼠肝癌模型进一步观察PrxⅠ蛋白在肝癌门静脉癌栓形成中的病理变化,运用免疫组化法检测在癌栓形成过程中Prx Ⅰ蛋白其阳性表达率的改变.临床随访40例肝癌合并门静脉癌栓患者术后肿瘤首次复发时间与Prx Ⅰ蛋白阳性表达的关系.结果 免疫组化显示肝癌原发灶组织的Prx Ⅰ蛋白表达阳性率明显高于癌栓组织的表达阳性率(70%比15%,P＜0.05),蛋白印迹结果 显示PrxⅠ蛋白在组织中的表达与免疫组化具有相同趋势,条带光度平均值在原发灶和癌栓组分别为1534.2和735.6(P＜0.01).大鼠肝癌模型汇管区肝癌组织在4、8、12、16、20、24周时,PrxⅠ蛋白阳性表达率分别为60%、80%、75%、65%、40%、20%,存在显著差异(P＜0.01).临床随访资料显示:原发灶PrxⅠ蛋白表达阳性组的门静脉癌栓患者(28例),其术后肿瘤首次复发时间(6.3个月)明显晚于PrxⅠ蛋白表达阴性组(12例)患者的时间(3.7个月).结论 肝癌门静脉癌栓组织中存在PrxⅠ蛋白的低度表达;PrxⅠ蛋白的表达与癌栓患者术后复发存在密切关系.

Abstract：

Objective To investigate the expression of peroxiredoxin 1 (Prx 1) in hepatocellular carcinoma (HCC) with portal vein tumor thrombosis (PVTT) and to evaluate the relationship between the expressions of Prx 1 and the postoperative recurrence of this disease. Methods Immunohisto chemistry and Western blotting were performed to examine the expression of Prx 1 protein in 40 patients with HCC with PVTT. Experiments on Sprague Dawley (SD) rat hepatoma model were further carried out to observe the pathological changes of Prx 1 by immunohistochemistry. Clinical outcomes were analyzed to find a correlation between the recurrence and positive rate of Prx 1. Results The expression level of Prx 1 was significantly up-regulated in primary tumor tissues than in tumor thrombosis samples (P＜0.01). Immunohistochemistry results showed that the positive rate of Prx 1 in primary tumor tissues were higher than that in tumor thrombosis. Western blotting confirmed a same trend in the level of Prx 1, the average luminosity of the blots were 1534.2 and 735.6, respectively. There was a significant difference in SD rat hepatoma model, the 4, 8, 12, 16, 20 and 24-week positive rates of Prx 1 in liver tumor tissues were 60%, 80%, 75% ,65%, 40% and 25% respectively. Clinical outcomes showed that the time to first postoperative recurrence of Prx 1 in the primary tumor positive group was significantly higher than that in the negative group (6. 3 vs 3. 7 months, P＜0. 01). Conclusions Prx 1 protein was down-regulated in HCC with PVTT. There was a negative correlation between the expression of Prx 1 and recurrence.