热休克蛋白70在胆道闭锁肝组织纤维化中作用及对预后影响

摘要

目的 探讨热休克蛋白70在胆道闭锁(BA)肝组织纤维化中的作用及对预后的影响.方法 选取择期行Kasai术治疗的BA患儿46例、胆总管囊肿患儿30例和门静脉海绵样变患儿17例;免疫组化染色检测肝组织中HSP 70蛋白表达,利用天狼星红-饱和苦味酸染色液检测BA患儿肝组织纤维化,双重染色法检测BA患儿不同纤维化肝组织中HSP 70蛋白表达,所有BA患儿术后均获得随访.结果 BA、胆总管囊肿以及静脉海绵样变患儿三组,HSP 70蛋白高表达比例的差异有统计学意义(x2=7.99,P=0.018),以BA组的HSP 70蛋白高表达比例为最高.等级相关分析显示,肝组织中HSP 70蛋白表达强度与肝纤维化程度呈正相关(r=0.861,P<0.001);46例BA患儿中,死亡15例,生存分析显示,轻度BA患儿术后生存率82.4%,中位生存时间(34.6±2.3)月;中重度患儿术后生存率58.6%,中位生存时间(25.5±2.8)月;Log-Rank检验显示,两组生存函数的差异有统计学意义(x2=5.27,P=0.012).BA患儿中,HSP 70蛋白低表达者的生存率85.0%,术后中位生存时间(34.0±2.6)月,HSP70蛋白高表达者生存率53.8%,术后中位生存时间(18.3±2.2)月;Log-Rank检验显示,两组生存函数差异有统计学意义(x2=4.77,P=0.029).结论 BA患儿肝组织中HSP 70蛋白呈高表达,且与肝组织纤维化程度呈正相关,推测其可能参与了肝纤维化进程,HSP 70表达上调往往预示患儿预后不良.%Objective To investigate the role of heat shock protein 70 (HSP70) in liver flbrosis in infants with biliary atresia (BA) and its impact on prognosis. Methods Fourty-six (46) cases of infants with BA undergoing elective Kasai surgery were selected. In the same period, 30 cases of children with choledochal cyst and 17 cases of children with portal vein cavernous transformation were selected. The expressions of HSP70 in liver tissues were detected using immunohistochemical staining. The liver flbrosis in children with BA was detected using Sirius red-saturated picric acid staining. The expressions of HSP70 proteins in different flbrotic liver tissues were detected by using double staining. All postoperative BA infants were followed up and ended at June 30, 2016.Results The proportion of high expression of HSP 70 proteins in BA infants were signiflcantly higher than that in children with choledochal cyst and vein cavernous transformation (P<0.05). Rank correlation analysis showed that the expressions of HSP70 in liver tissues were positively correlated with the degree of liver flbrosis (r=0.861,P<0.05). 15 patients died among 46 cases of BA infants. The survival rate in BA children with mild liver flbrosis was 82.4%, which was signiflcantly higher than 58.6% in the severe group (P<0.05). The survival rate in HSP70 protein low expression group was 85.0%, while in HSP70 protein high expression group was 53.8%. Kaplan-meier survival analysis showed that the median survival time in the HSP70 protein low expression group was (34.0±2.6) months, while in the HSP70 protein high expression group was (18.3±2.2) months, the difference was statistically signiflcant (χx2=4.765,P=0.029).Conclusions The expressions of HSP70 proteins in liver tissues in infants with BA were high and were positively correlated with the degree of hepatic flbrosis. It suggested the possible involvement of HSP70 in the process of liver fibrosis. The upregulated expressions of HSP70 often indicated poor prognosis in children. It could be used as determining biomarker for prognosis.