机构地区:[1]首都医科大学附属北京佑安医院感染与免疫研究中心,100069 [2]首都医科大学附属北京佑安医院肝病科,100069
出 处:《中华预防医学杂志》2009年第8期690-694,共5页Chinese Journal of Preventive Medicine
基 金:国家自然科学基金(30571723);北京市自然科学基金(7092046)
摘 要:目的通过观察乙型肝炎病毒(HBV)特异性细胞毒性T细胞(CTL)抗原表位肽刺激外周血单个核细胞(PBMC)产生γ干扰素(IFN-γ)的能力,分析不同类型HBV感染人群特异性CTL免疫应答差异。方法合成4条人类白细胞抗原(HLA)-A2限制性HBV特异性CTL抗原表位肽[分别为多聚酶P的575-583序列FLLSLGIHL(Tp),HBsAg28-39序列IPQSLDSWWTSL(Te1),HBsAg183—191序列FLLTRILTI(Te2)和HBcAg18-27序列FLPSDFFPSV(Tc)]。流式细胞术鉴定HLA基因表型。用合成的CTL表位肽分别刺激慢性乙型肝炎组(CHB)、慢性乙型重型肝炎组(CSH),既往HBV感染者(N1)组和健康献血员(N2)的PBMC,采用酶联免疫斑点法(ELISPOT)检测分泌IFN-γ的CTL细胞的频率。结果(1)HLA—A2基因分布频率:44例CHB组为45.5%(20/44),18例CSH组为55.6%(10/18),10例N1组为60%(6/10),10例N2组全部选择以往研究已确定的HLA—A2阳性者。(2)ELISPOT检测结果:①4条HBV特异性抗原多肽反应阳性率在CHB组、CSH组、N1组和N2组分别为50%(10/20)、10%(1/10)、83.3%(5/6)和10%(1/10)。N1组反应阳性率高于CSH组(χ^2=9.000,P=0.008)和N2组(χ^2=9.000,P=0.008)。②各组对Tp、Te1、Te2和Tc四条肽的平均反应强度用斑点形成细胞(SFC)/10^6PBMC表示,采用非参数秩和检验,N1组对Tp、Te1、Te2和Tc肽的平均反应强度大于CSH组和N2组(分别为77SFC/10^6PBMCvs10SFC/10^6PBMCvs15SFC/10^6PBMC,59SFC/10^6PBMCvs0SFC/10^6PBMCvs0SFC/10^6PBMC,100SFC/10^6PBMCvs0SFC/10^6PBMCvs22SFC/10^6PBMC和57SFC/10^6PBMCvs20SFC/10^6PBMCvs30SFC/10^6PBMC,均P〈0.01)。结论各种类型HBV感染者不论病毒清除与否,都可对HBV特异性多肽产生T细胞免疫反应,这种免疫反应以既往感染者最强,慢性乙型肝炎组较弱,慢性乙型重型肝炎组缺乏,提示HBV特异性CTL应答可能是自Objective To investigate the ability of secreting interferon-γ(IFN-γ) of the peripheral blood monocular cells (PBMC) stimulated by hepatitis B virus (HBV) -specific cytotoxic T lymphocyte (CTL) epitopes peptides and to analyze the difference of CTL immune response in patients with HBV infection. Methods Four HLA-A2-restricted HBV cytotoxic T lymphocyte epitopes [ Tp: HBV polymerase 575-583 ( FLLSLGIHL), Tel : envelope 28-39 ( IPQSLDSWWTSL ), Te2: envelope 183-191 ( FLLTRILTI ) and Tc: core 18-27 (FLPSDFFPSV)J were synthesized. Human leucocyte antigen (HLA)-A2 typing was detected by Flow cytometry. PBMCs which were isolated from patients with chronic hepatitis B (CHB), patients with chronic severe hepatitis B ( CSH ), subjects with past HBV infection ( N1 ) and healthy blood donors(N2) were stimulated by the four HLA-A2-restricted HBV CTLs epitopes. Enzyme linked immunospot (ELISPOT) assay was used to detect the frequency of secreting IFN-γ CTL in each group. Results ( 1 )HLA-A2 typing:20 of 44 patients with CHB (45.5%) were HLA-A2 positive,10/18 (55.6%) in CSH and 6/10 (60%) in group N1 were HLA-A2 positive. 10 healthy blood donors' HLA-typing was detected in the early study. (2) ELISPOT results: (1)The total responses to the four epitopes in CHB, CSH, N1 and N2 groups were 50% (10/20), 10% (1/10) ,83.3% (5/6) and 10% (1/10), respectively. The response in N1 group was significantly higher than that in CSH group (χ^2 =9. 000,P =0. 008) and N2 group (χ^2 =9. 000, P = 0. 008 ). (1) The CTL average magnitude response to Tp epitope, Te1 epitope, Te2 epitope and Tc epitope was also significantly higher in past HBV infection group(77 SFC/10^6 PBMC,59 SFC/10^6 PBMC, 100 SFC/ 10^6 PBMC and 57 SFC/10^6 PBMC,respectively) than that of CSH group( 10 SFC/10^6 PBMC,0 SFC/10^6 PBMC,0 SFC/10^6 PBMC and 20 SFC/10^6 PBMC respectively, all P 〈 0. 01 ) and N2 group ( 15 SFC/10^6 PBMC,0 SFC/10^6 P
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