慢性乙型肝炎树突状细胞表型和功能的变化与免疫耐受

目的 观察慢性乙型肝炎病毒（HBV）感染者树突状细胞（DC）形态和功能的改变。方法 从13例慢性乙型肝炎患者和11例健康人外周血中分离和培养DC,观察DC的形态,用流式细胞仪检测DC表面标记HLA－DR、CD1a、CD80和CD86的表达,用^3H-TdR掺入法测定DC诱导混合性淋巴细胞反应（MLR）的能力。结果 正常DC较慢性乙型肝炎患者在形态上更为典型,不规则,HLA－DR、CD80和CD86分子的表达水平较高（P＜0.05）,诱导MLR的能力较强（P＜0.05）。结论 慢性乙型肝炎患者外周血DC处于不完全成熟状态,其免疫刺激能力较低。     

胸腺肽α1对慢性乙型肝炎患者外周血树突状细胞调节作用的体外研究

背景：近年研究显示慢性乙型肝炎（CHB）患者体内树突状细胞（DC）存在不同程度的功能缺失。胸腺肽α1（T-α1）是一种生物学应答调节物质,对CHB的临床治疗有较好疗效。目的：研究T-α1对CHB患者外周血DC分化和功能成熟的影响,寻求改善DC功能的途径。方法：从12例CHB患者和10名健康志愿者的外周血单个核细胞（PBMC）中分离培养DC。培养过程中应用不同浓度T-α1干预DC。以流式细胞仪检测DC表面标志,以甲基噻唑基四唑（MTT）实验检测混合淋巴细胞反应中DC刺激T细胞增殖的能力。结果：从PBMC分离培养得到的外周血DC呈现典型树突状形态。CHB组DC表面标记物CD80、CD86、人白细胞位点DR抗原（HLA-DR）水平以及刺激T细胞增殖的能力显著低于正常对照组（P〈0.001）;经T-α1干预后,两组上述指标均较相应空白对照升高,尤以0.5μg/mlT-α1的作用为著（P〈0.05）,可使CHB组上述指标恢复至正常水平。结论：T-α1能促进CHB患者外周血DC分化和功能成熟,在CHBDC疫苗的研究中可能具有重要价值。     

细胞因子诱导的自体杀伤细胞回输治疗慢性乙型肝炎患者树突状细胞功能的研究

目的了解细胞因子诱导的自体杀伤（CIK）细胞回输治疗是否能恢复慢性乙型肝炎（CHB）患者树突状细胞（DC）的功能。方法12例CHB患者应用CIK细胞回输治疗,入组前6个月至CIK细胞治疗随访期间,患者未接受任何抗病毒及免疫调节治疗。观察24周后患者髓样树突状细胞（mDC）、浆细胞样树突状细胞（pDC）比例和功能变化,并对其变化结果进行分析。结果应用CIK细胞回输治疗24周后,病毒载量下降≥2个log或转阴的患者外周血mDC、pDC功能明显提高。病毒学应答患者（n=6）病毒载量下降水平与外周血DC功能的恢复密切相关。结论CHB患者接受CIK细胞回输治疗可以提高外周血mDC和pDC功能。     

慢性乙型肝炎患者单核细胞来源树突状细胞Toll样受体的表达特征分析

目的观察慢性乙型肝炎（CHB）患者单核细胞来源树突状细胞（moDC）Toll样受体（TLR）的表达，并分析抗病毒相关TLR（TLR3、TLR4、TLR7、TLR8、TLR9）在CHB患者moDC的表达特征及意义。方法用羟乙基淀粉（HES）分离10例CHB患者及15例健康对照外周血单个核细胞（PBMC），经重组人粒细胞-巨噬细胞集落刺激因子（rhGM-CSF）、重组人白细胞介素4（rhIL-4）诱导培养树突状细胞（DC），经流式细胞仪用特异性单克隆抗体检测不同成熟阶段DC的TLR表达，并以HBcAg负载未成熟DC，应用FACS分析HBcAg的负载效率及细胞内IFN-γ、IL-4表达水平。结果moDC不同成熟阶段TLR的表达水平不同；CHB患者的未成熟moDC（imDC）表达的TLR7、TLR8低于健康对照（75．9％、1．0％比98．4％、15．4％，P〈0．05），CHB患者成熟moDC（mDC）表达TLR3、TLR7低于健康对照（9．5％、79．7％比11．5％、90．7％，P〈0．05）；应用HBcAg分别于细胞培养第3天和第5天冲击DC，第1次冲击后48hHBcAg的膜内、膜外负载率分别为53．0％和7．5％，第2次冲击后分别为80．2％和19．0％；HBcAg负载或未负载的moDC，均刺激淋巴细胞高表达IFN-γ，较少表达或不表达IL-4，呈现显著的Th1免疫应答。结论CHB患者moDC的抗病毒相关TLR表达低下，且可能是其DC功能低下的重要原因之一；应用HBcAg冲击imDC，可使其有效负载HBcAg，负载后DC的成熟过程及功能不受影响，仍以诱导Th1免疫应答反应为主。     

慢性乙型肝炎患者树突状细胞特点及其免疫治疗

树突状细胞（DC）是诱导和维持抗原特异性免疫应答非常重要的抗原提呈细胞（APC），研究表明慢性乙型肝炎（CHB）患者体内DC功能下降，这可能是导致CHB的重要原因之一。DC增强免疫疗法的基本原理是提高CHB患者体内DC功能，诱导强烈的HBV特异性免疫反应清除病毒。     

小鼠骨髓成熟与未成熟树突状细胞的生物免疫学功能比较研究

目的比较成熟和未成熟状态小鼠骨髓树突状细胞（Dc）的生物免疫学功能的差异。方法粒细胞一巨噬细胞刺激因子（GM—CSF）和白细胞介素（IL）-4联合诱导培养小鼠骨髓未成熟Dc，经LPS刺激制备成熟Dc。分别收集培养第6天的两组Dc并用小鼠CD11c免疫磁珠纯化。电镜下观察成熟和未成熟DC的细胞形态。经流式细胞术检测两组细胞表面分子（MHC—Ⅱ、CD86和CD40）的表达水平。另将收集的DC分别与异基因小鼠脾脏T细胞共培养72h，四唑蓝（MTF）比色法检测T细胞增殖程度。取细胞上清液，液相芯片法检测Th1／Th2细胞因子表达水平。结果电镜下可见两组Dc在形态上存在很大差异。同成熟DC相比，未成熟DC细胞表面较光滑，细胞内存在大量的吞噬小泡。流式细胞术分析显示未成熟DC细胞表面3类分子（MHC—Ⅱ、CD86和CD40）的表达水平均明显低于成熟DC组。混合淋巴细胞反应（MLR）显示．未成熟DC刺激T细胞增殖显著低于相应反应比例的成熟DC，差异有统计学意义（P〈0．05）。细胞因子表达谱表明未成熟DC组分泌Th1细胞因子（IL-2和IFN-γ）较成熟DC组显著下降（P〈0．01）．Th2细胞因子相对占主导。结论未成熟DC倾向于诱导T细胞免疫耐受，有效抑制DC的成熟并维持DC的未成熟状态将有望用于治疗类风湿关节炎等由Th1细胞介导的自身免疫性疾病。     

慢性乙型肝炎患者外周血树突状细胞的成熟度研究

目的：研究慢性乙型肝炎（CHB）患者外周血树突状细胞（DC）的成熟度及其占单核细胞的比例,探讨CHB患者DC免疫治疗的机制。方法选取20例CHB患者和10例健康人,分别采集外周抗凝全血2 mL,流式细胞仪检测DC表面CD80、CD86、CD83的表达量及单核细胞表面CD14的表达。结果两组DC表面CD80、CD86、CD83分子表达无差异（P＞0．05）;CHB组较健康对照组单核细胞表面分子 CD14表达明显增多,具显著统计学差异（P＜0．05）;CHB组CD80、CD86、CD83三者表达之和占CD14的比例明显高于CHB组,两者有显著统计学意义（P＜0．05）。结论CHB患者外周血存在单核细胞增多、成熟DC减少现象,恢复DC功能是治疗CHB的手段之一。     

含CpG基序寡核苷酸对慢性乙型肝炎患者外周血树突状细胞的免疫激活研究

目的 研究含非甲基化CpG基序的寡核苷酸（CpG-ODN）对慢性乙型肝炎患者（CHB）外周血树突状细胞（DC）表型和功能的影响。方法以CD14磁性分选微珠分离CHB患者外周血高纯度单核细胞；以重组人粒细胞巨噬细胞集落刺激因子（hGM—CSF）、重组人白细胞介素-4（hIL-4）诱导扩增DC；以CpG-ODN刺激DC成熟，并与肿瘤坏死因子（TNF）-n比较，评价其对DC表达表面分子人类白细胞组织相容性抗原（HLA）-DR、CD86、CD1a，分泌IL-12p70以及刺激同种T细胞增殖能力的影响。结果与non—ODN和磷酸盐缓冲液（PBS）组比较，CpG-ODN能明显提高CHB患者外周血DC表面分子HLA—DR、CD86的表达，使IL-12分泌增加，刺激同种异体T细胞增殖的能力亦显著增强（P=0．017和0．023），但不能明显提高CD1a的表达；CpG-ODN的上述刺激作用接近或略逊于hTNF-α，但差异无统计学意义（P〉0．05）。结论CpG-ODN与hTNF-α一样能够促进CHB患者外周血DC成熟进而增强其抗原提呈功能。     

细粒棘球绦虫Eg10诱导树突状细胞产生Th2免疫反应

目的 研究细粒棘球绦虫蛋白10(antigen 10 of Echinococcus granulosus Eg10)对小鼠感染细粒棘球绦虫免疫机制的影响。方法 通过体外培养骨髓来源的小鼠树突状细胞(Bone marrow dendritic cell, BMDC),用不同的抗原包囊囊液(hydatid fluid HF)、 Eg10、脂多糖(lipopolysaccharide LPS)单独或联合作用DC,共6组。通过扫描电镜和透射电镜观察各组DC形态学的变化;通过流式细胞仪检测DC的吞噬能力、迁移能力的变化、刺激T细胞增殖能力的变化及DC表面分子的表达情况;利用ELISA检测DC分泌各种细胞因子的变化。结果 Eg10抑制DC向成熟状态发展,与囊液对照组相比,DC表面仅增多了褶皱,两者均可提高DC吞噬能力;刺激T细胞的增殖能力很弱,但是能够提高Treg细胞的含量;同时发现Eg10组DC表面分子MHCII 和CD86的表达量高于空白组,分泌高含量的IL-10, IL-6。通过给予LPS联合刺激DC形态趋于半成熟状态,细胞表面树突增加,表面分子MHCII、CD80、CD40的表达增高,CD86的表达量降低;IL-10和IL-6的含量也相应的下降。结论 Eg10诱导DC产生Th2反应。     

慢性乙型肝炎患者树突状细胞功能与单个核细胞乙型肝炎病毒共价闭合环状DNA的关系

目的 探讨慢性乙型肝炎(CHB)患者外周血单个核细胞(PBMC)及树突状细胞(DC)内HBV共价闭合环状DNA(HBV cccDNA)的存在状况,DC成熟度及功能状态与DC或PBMC中HBV cccDNA载量的关系.方法 分离29例CHB患者和10例健康对照者的PBMC,用重组人粒细胞-巨噬细胞集落刺激因子(GM-CS...     

Dendritic cells from chronic hepatitis B patients can induce HBV antigen-specific T cell responses

AIM: To determine whether dendritic cells (DCs) from chronic hepatitis B patients could induce HBV antigen-specific T cell responses or not. METHODS: DCs were generated from peripheral blood mononuclear cells of patients with chronic hepatitis B (CHB) infection and healthy donors. We compared the phenotypes of these DCs and their ability to secrete cytokines and to participate in mixed lymphocyte reactions. In addition, autologous lymphocytes were cultured with DCs loaded with HBV core region peptide HBcAg8-27, an epitope recognized by cytotoxic T lymphocytes (CTL), and bearing human leucocyte antigen (HLA)-A2 for 10 d. Cytokine secretion and lytic activity against peptide-pulsed target cells were assessed. RESULTS: DCs with typical morphology were generated successfully by culturing peripheral blood mononuclear cells (PBMCs) from CHB patients with AIM-V containing GM-CSF and IL-4. Compared with DCs from normal donors, the level of CD80 expressed in DCs from CHB patients was lower, and DCs from patients had lower capacity of stimulate T cell proliferation. When PBMCs isolated from patients with chronic or acute hepatitis B infection and from normal donors were cocultured with HBcAg18-27 peptide, the antigen-specific memory response of PBMCs from acute hepatitis B patients was stronger than that of PBMCs from chronic hepatitis B patients or normal donors. PBMCs cocultured with DCs treated with HBcAg18-27 CTL epitope peptide induced an antigen-specific T cell reaction, in which the level of secreted cytokines and lytic activity were higher than those produced by memory T cells. CONCLUSION: DCs from patients with CHB can induce HBV antigen-specific T cell reactions, including secretion of cytokines essential for HBV clearance and for killing cells infected with HBV.     

负载HBcAg对慢性HBV感染患者树突状细胞的活化作用及功能影响

目的:探讨免疫耐受期慢性乙型肝炎(CHB)患者外周血树突状细胞(DC)负载HBcAg后细胞表型及免疫功能的改变。方法:从CHB免疫耐受期患者外周血分离培养DC,在DC成熟前,加入重组HBcAg表位肽,诱导HBV特异性DC分化成熟,流式细胞仪检测DC表面共刺激分子CD1a、CD80、CD83的表达水平,应用淋巴细胞增殖试验评估DC功能。结果:负载不同剂量的HBcAg后,DC细胞活化增强,DC细胞共刺激分子标志物CD1a、CD80以及CD83表达率均明显上升,且随着抗原负载剂量的增加,表达率进一步增加,各组之间差异具有统计学意义(均P<0.001);未负载HBcAg的DC细胞激活的淋巴细胞反应较弱,负载HBcAg的DC细胞刺激同种异体健康成人T淋巴细胞增殖能力增强,且随着负载抗原剂量的加大,T淋巴细胞的增殖能力进一步提高,与未负载抗原的对照组相比,差异具有统计学意义(F=428.14,P=0.000)。结论:体外负载HBcAg刺激CHB患者DC细胞可增强其有效抗原提呈能力,促进T淋巴细胞增殖。     

Restoration in vitro of impaired T-cell responses in patients with chronic hepatitis B by autologous dendritic cells loaded with hepatitis B virus proteins (R2)

BACKGROUND: The purpose of the present paper was to investigate dendritic cell (DC) and T-cell functions in patients with chronic hepatitis B (CHB) and determine whether therapeutic DC vaccines could restore T-cell function in those patients in vitro. METHODS: Twelve patients with CHB and 10 normal control subjects with positivity for antibodies to hepatitis B surface and core antigens (anti-HBs and anti-HBc positivity) were enrolled in the present study. Phenotype analysis and allogeneic mixed lymphocyte reaction assay of DC from CHB patients and normal controls were made in the absence or presence of a cocktail of cytokines: interleukin-1beta (IL-1beta), prostaglandin E(2) (PGE(2)), IL-6 and tumor necrosis factor-alpha (TNF-alpha). Autologous T-cell proliferation assays and the enzyme-linked immunospot (ELISPOT) method for detecting interferon-gamma (IFN-gamma)-producing CD8(+) T cells were used to evaluate the efficacy of DC loaded in vitro with HBsAg or HBcAg. RESULTS: The DC from CHB patients had a lower expression of costimulatory molecules CD80, CD86 and impaired allogeneic mixed lymphocyte reaction capacity compared to those from normal controls. However, the impaired DC function could be restored partially by cytokine cocktail supplemented in vitro. Mature DC loaded with HBsAg or HBcAg showed a greater capacity for autologous T-cell proliferation and antigen-specific IFN-gamma production than immature DC. Moreover, as a DC -loading antigen, HBcAg was more immunogenic than HBsAg. CONCLUSIONS: The impaired function of DC in patients with CHB may be restored by supplementation in vitro with a cocktail of cytokines, and therapeutic DC vaccines might be effective to treat CHB infection in humans.     

“慢加急”乙型肝炎肝功能衰竭患者外周血树突状细胞亚群的特点及其临床意义

目的慢性乙型肝炎患者体内树突状细胞（DC）功能缺陷是导致宿主特异性免疫反应低下和病毒感染慢性化的主要因素。然而,目前还不清楚＂慢加急＂乙型肝炎肝功能衰竭患者体内的DC特点及其临床意义。方法在知情同意的基础上,本研究入组40例＂慢加急＂乙型肝炎肝功能衰竭患者,同时入组20例健康人和20例慢性乙型肝炎患者作为对照,调查上述人群外周血DC亚群的频率、功能及其临床意义。结果相对于健康人和慢性肝炎患者,＂慢加急＂乙型肝炎肝功能衰竭患者外周血浆样树突细胞（pDCs）频率明显降低,并且pDCs产生α干扰素（IFNα-）的能力也显著下降。进一步分析表明,pDC分泌IFNα-的能力在＂慢加急＂乙型肝炎肝功能衰竭死亡患者明显低于存活患者,并与肝功能衰竭严重程度呈显著负相关。结论 ＂慢加急＂乙型肝炎肝功能衰竭患者外周血DC数量和功能明显降低,可作为疾病严重性的预测指标。     

HBcAg-pulsed dendritic cell vaccine induces Th1 polarization and production of hepatitis B virus-specific cytotoxic T lymphocytes

Aim:  Dendritic cells (DCs) pulsed with HBsAg efficiently reverse the immune tolerance to hepatitis B virus (HBV) and induce HBV-specific cytotoxic T lymphocyte (CTL) responses in transgenic mice and healthy volunteers. However, it is not clear whether HBV core antigen (HBcAg)-pulsed DCs can effectively induce CD4⁺ helper T cells polarization into Th1, which contribute to the induction and maintenance of HBV-specific CD8⁺ T cells in chronic hepatitis B (CHB) patients. To address this issue, we conducted this study and investigated whether HBcAg-pulsed DCs could polarize Th1 cells and induce an HBcAg-specific CTL response.
Methods:  HBcAg-pulsed DCs were generated from 21 CHB patients. The capacity of the HBcAg-pulsed DC vaccine to stimulate CD4⁺ and CD8⁺ T cells to produce IFN-γ and IL-4 was estimated by intercellular cytokine staining, and the HBcAg-pulsed DCs derived from 10 humam leucocyte antigen (HLA)-A2⁺ CHB patients were tested for the induction of HBV-specific CTLs from autologous T cells by pentamer staining. The cytotoxicity of these CTLs was evaluated in vitro by flow cytometry.
Results:  The HBcAg-pulsed DCs derived from CHB patients exhibited a stronger capacity to stimulate autologous CD4⁺ and CD8⁺ T cells to release IFN-γ rather than IL-4, which could induce HBV core 18-27 specific CTLs, suggesting a specific cytotoxicity against T2 cells that had been loaded with the HBV core 18-27 peptide in vitro .
Conclusion:  HBcAg-pulsed DC vaccine derived from CHB patients efficiently induced autologous T cell polarization to Th1 and generation of HBV core 18-27 specific CTLs.     

慢性乙型肝炎患者外周血树突状细胞诱导特异性T淋巴细胞应答

目的 探讨慢性乙型肝炎患者外周血树突状细胞(Dc)是否诱导特异性T细胞应答。方法(1)将研究对象分为慢性乙型肝炎患者组、急性乙型肝炎痊愈组、健康志愿者组,分离各组研究对象的外周血单个核细胞(PBMC),细胞内细胞因子染色方法检测其对细胞毒性T淋巴细胞(CTL)特异表位多肽乙型肝炎病毒核心抗原(HBcAg)18-27的记忆性免疫应答;(2)培养慢性乙型肝炎患者DC,将负载有乙型肝炎抗原表位多肽的DC诱导特异的T细胞应答。采用细胞内细胞因子染色方法检测诱导的T细胞分泌的细胞因子,乳酸脱氢酶释放法测定诱导的T细胞杀伤活性。结果(1)急性乙型肝炎患者PBMC对HBcAg 18-27 CTL特异表位多肽存在记忆的免疫应答,其分泌干扰素-γ的CD8+T细胞占CD8+T细胞总数的(4.3±2.5)％,分泌白细胞介素-2的占总细胞数的(4.8±2.2)％,分泌肿瘤坏死因子-α占总细胞数的(4.6±2.3)％。而慢性乙型肝炎患者和健康志愿者对其记忆应答很低,与急性乙型肝炎患者比较差异有显著性,t值为2.508-3.305,P<0.05。(2)用多肽共孵育过的慢性乙型肝炎患者DC多次诱导的T细胞慢性乙型肝炎患者组,加肽孵育的靶细胞比例为30:1、10:1、3:1时,其杀伤率分别为(57.0±20.3)％、(49.5±20.2)％、(21.8±12.9)％,均高于对照组,表明慢性乙型肝炎患者DC可以诱导特异的T     

慢性乙型肝炎患者外周血树突状细胞表型及抗原提呈能力与HBV载量的关系

目的探讨慢性乙型肝炎(CHB)患者外周血树突状细胞(DCs)表型及抗原提呈能力与HBV载量的关系.方法采集23例CHB患者和8例健康人的抗凝外周静脉血,分离外周血单个核细胞(PBMCs),在重组人白细胞介素4和重组人粒细胞-巨噬细胞集落刺激因子的作用下培养使DCs增殖、成熟,以间接免疫荧光流式细胞技术分别检测DCs表面CD80、CD86、HLA-DR及ICAM-1的表达;将培养成熟的DCs与HBsAg共同孵育,用丝裂霉素C处理后再与自体PBMCs共同培养,在培养结束前12 h加入^3H-TDR,收集细胞,以β液闪计数仪测定cpm值;同期用定量聚合酶链反应技术测定CHB患者外周血HBV载量.结果患者DCs表面CD86、HLA-DR和ICAM-1的表达水平及DCs的抗原提呈能力均显著低于健康对照组;CD80、CD86、HLA-DR及ICAM-1的表达与HBV载量呈显著负相关(分别为P＜0.01,P＜0.01,P＜0.001和P＜0.001);DCs的抗原提呈能力也与HBV载量呈显著负相关(为P＜0.001).结论CHB患者外周血DCs的成熟和功能存在障碍,DCs的抗原提呈能力与血液中HBV的载量密切相关,并可能对HBV的清除产生重要的影响.     

Safety and immunogenicity of hepatitis B surface antigen‐pulsed dendritic cells in patients with chronic hepatitis B

Summary. The immune modulator capacity of antigen‐pulsed dendritic cells (DC) has been documented in patients with cancers and in animal models of chronic viral infections. Cancer antigen‐pulsed DC are now used for treating patients with cancer. But viral antigen‐pulsed DC are not used in chronic viral‐infected patients because safety of antigen‐pulsed DC has not been evaluated in these patients. DC were isolated from human peripheral blood mononuclear cells by culturing with human‐grade granulocyte‐macrophage colony stimulating factor and interleukin‐4. Human blood DC were cultured with hepatitis B surface antigen (HBsAg) for 8 h to prepare HBsAg‐pulsed DC. After immunogenicity assessment of HBsAg‐pulsed DC in vitro, five million HBsAg‐pulsed DC were administered intradermally to five patients with chronic hepatitis B (CHB) 1–3 times. HBsAg‐pulsed DC were immunogenic in nature because they produced significantly higher levels of interleukin‐12 and interferon‐γ compared to unpulsed DC (P < 0.05). Also, HBsAg‐pulsed DC induced proliferation of HBsAg‐specific T lymphocytes in vitro. CHB patients injected with HBsAg‐pulsed DC did not exhibit generalized inflammation, exacerbation of liver damage, abnormal kidney function, or features of autoimmunity. Administration of HBsAg‐pulsed DC induced anti‐HBs in two patients and HBsAg‐specific cellular immunity in 1 patient. This is the first study about preparation of antigen‐pulsed DC using human consumable materials for treating patients with CHB. Because HBsAg‐pulsed DC were safe for all patients with CHB and had immune modulation capacity in some patients, phase I and phase II clinical trials with antigen‐pulsed DC in CHB and other chronic infections are warranted.     

慢性乙型肝炎病毒感染产妇的胎儿脐带血树突状细胞的表型及功能

目的探讨孕妇慢性乙型肝炎病毒(HBV)感染对其胎儿脐血的树突状细胞(DC)的表型和功能的影响,并与健康胎儿、健康成人及成人慢性HBV感染者进行对比研究。方法体外分离慢性HBV 感染产妇及健康产妇胎儿脐带血、健康成人及慢性乙型肝炎患者外周血单个核细胞进行树突状细胞转化,行流式细胞术对其表型进行分析,通过交叉混合淋巴细胞培养和DC培养上清液白细胞介素(IL)-12检测来分析DC的功能。结果慢性HBV感染产妇脐血来源DC的CD 80、CD 83的表达显著低于健康胎儿组、健康成人组、成人慢性HBV感染组,CD14的表达则显著高于此三组,P值均<0.0 5;慢性HBV感染产妇脐带血DC分泌的IL-12水平也明显低于健康产妇、健康成人组及慢性乙型肝炎患者(P<0.05);促异体T淋巴细胞增殖能力的强弱依次为健康成人DC-健康脐血T淋巴细胞>健康成人DC-健康成人异体T淋巴细胞>健康脐血DC-异体健康脐血T淋巴细胞>健康脐血DC-健康成人T淋巴细胞>孕母HBV感染脐血DC-健康脐血T淋巴细胞>孕母HBV感染脐血DC-健康异体成人T淋巴细胞。结论慢性HBV感染产妇胎儿脐血DC的成熟和功能显著低于健康胎儿脐血DC、健康成人甚至慢性乙型肝炎患者外周血DC。     

Dysfunction of peripheral blood dendritic cells from patients with chronic hepatitis B virus infection

AIM: To identify the property of dendritic cells (DCs) of peripheral blood monocytes (PBMC) in patients with chronic HBV infection. METHODS: Twenty patients with persistent HBV infection were included in this study, 10 healthy subjects being used as a control group. The peripheral blood mononuclear cells (PBMC) of T cell-depleted populations were incubated and induced into mature dendritic cells in the RPMI-1640 medium in the presence of cytokines GM-CSF, IL-4, FLt-3,TNF-alpha and 100mL.L(-1 )of fetal calf serum for a total of 10-12 days. The expressions of surface markers on DCs were evaluated using flow cytometric analysis. ELISA method was used to determine the cytokine levels of interleukin-12 (IL-12) and IL-10 in the supernatant produced by DCs. For detection of the stimulatory capacity of DCs to T cell proliferation, mytomycin C-treated DC were incubated with allogenic T cells. RESULTS: A typical morphology of mature DCs from healthy subjects and HBV-infected patients was induced in in vitro incubation, but the proliferation ability and cellular number of DCs from HBV-infected patients significantly decreased compared with healthy individuals. In particular, the expression levels of HLA-DR, CD80 (B7-1) and CD86 (B7-2) on DC surface from patients were also lower than that from healthy individuals (0.46 vs 0.92 for HLA-DR, 0.44 vs 0.88 for CD80 and 0.44 vs 0.84 for CD86,P<0.05). The stimulatory capacity and production of IL-12 of DCs from patients in allogenic mixed lymphocyte reaction (AMLR) significantly decreased, but the production level of nitric oxide (NO) by DCs simultaneously increased compared with healthy subjects (86 +/- 15 vs 170 +/- 22 micromol.L(-1), P <0.05). CONCLUSION: The patients with chronic HBV infection have the defective function and immature phenotype of dendritic cells, which may be associated with the inability of efficient presentation of HBV antigens to host immune system for the clearance of HBV.