血浆疗法治疗大疱性类天疱疮的临床疗效及自身抗体水平变化

目的:通过研究大疱性类天疱疮(bullous pemphigoid, BP)患者的临床资料,提高对大疱性类天疱疮的认识,并初步评价血浆疗法治疗大疱性类天疱疮的临床疗效,并探索其治疗机制。方法:2009年12月—2015年12月我院皮肤科收治的大疱性类天疱疮患者66例,28例患者接受血浆疗法联合糖皮质激素治疗,作为血浆疗法组(PT组),38例患者单纯应用糖皮质激素治疗,作为单纯糖皮质激素治疗组(HT组),比较两组的临床疗效,每组各采集16名患者的血清,以20名健康者血清作为对照,采用酶联免疫吸附(ELISA)法检测治疗前后血清中抗BP180抗体水平的变化以及抗BP180抗体亚型IgG1、IgG4水平的变化。结果:PT组有效率为92.86%,HT组为73.68%,PT组的治疗效果更为显著。两组患者治疗后抗BP180抗体滴度明显下降(P0.01),PT组较HT组下降明显(P0.01),PT组患者治疗后抗体亚型IgG1、IgG4测得的吸光度A值明显下降(P0.05)。结论:血浆疗法治疗大疱性类天疱疮有效,其机制可能与降低抗BP180抗体及抗体亚型IgG1、IgG4的水平有关。     

寻常性银屑病并发成人型线状IgA大疱性皮病

报告l例寻常性银屑病并发成人型线状IgA大疱性皮病.患者男,36岁.因全身红色斑疹伴白色鳞屑反复发生20年.躯干、双上肢出现环状排列的水疱10d伴瘙痒就诊.皮损组织病理检查:表皮下水疱,疱内、真皮浅层和真皮乳头见中性粒细胞、嗜酸性粒细胞浸润;皮损周围皮肤直接免疫荧光显示基膜带Iga、IgG呈带状沉积;取患者血清行BP180NC16A(大疱性类天疱疮18 000抗原的近膜片段)-ELISA检查显示阴性;以盐裂正常人皮肤为底物,取患者血清行间接免疫荧光检查显示IgA、IgG呈带状沉积在真皮侧.诊断为寻常性银屑病并发成人型线状TgA大疱性皮病.     

大疱性类天疱疮自身反应性IgG抗体亚型研究进展

大疱性类天疱疮（BP）是一种自身免疫性表皮下大疱性皮肤病,以c3和（或）IgG在基底膜带线状沉积为特征。研究提示,抗BP180IgG抗体通过激活补体,可能是诱发大疱形成的主要原因,而自身抗体结合的抗原表位多数包括BP180NC16A结构域。由于不同IgG抗体亚型含量以及激活补体的能力不同,其致病性也不同。免疫荧光和酶联免疫吸附试验提示,IgG1和IgG4为主要的自身反应抗体亚型。体外实验和动物模型均证实,IgG1为主要的致病抗体,其含量与BP的严重程度平行;IgG4具有较弱的活化炎症细胞的致病作用和封闭抗原表位的保护作用。最近的研究提示,抗BP180IgG抗体可以不依赖激活补体和炎症细胞这两种方式诱导表皮真皮分离。因而关于各IgG亚型的致病能力,特别是IgG4的作用现在仍然不清楚。     

大疱性类天疱疮和妊娠疱疹患者血清抗BP180 NC16A抗体的纯化和鉴定

目的 探讨大疱性类天疱疮（BP）和妊娠疱疹（HG）患者血清抗BPl80 NC16A 抗体的纯化和鉴定方法。方法 原核表达系统pGEX-2TBP180NC16A表达GST/NC16A融合蛋白,将融合蛋白与谷胱甘肽琼脂糖凝聚微珠进行共价偶联。微珠亲和层析法纯化BP和HG患者血清中抗BP180 NC16A抗体,并用ELISA、免疫荧光、及Western印迹进行鉴定。结果 原核表达系统pGEX-2TBP180NC16A表达37 000 GST/NC16A融合蛋白,微珠亲和层析法纯化后得单一抗BP180 NC16A抗体。经ELISA方法定量后确定其含量为2.4 mg/ml;该抗体能与人皮肤基底膜带结合,证明抗体活性;免疫印迹可见单一片段,显示抗体纯度。结论 微珠亲和层析法纯化的BP和HG患者血清中抗BP180 NC16A自身抗体活性高、特异性强。     

BP180相关自身免疫性水疱病的研究进展

BP180相关自身免疫性水疱病包括大疱性类天疱疮、扁平苔藓样类天疱疮、线状IgA大疱性皮病、妊娠类天疱疮和瘢痕性类天疱疮。BP180胞外区含有多个自身抗体反应的位点,目前研究显示,BP180上相关自身免疫性水疱病靶位呈现出异质性,并且同一种疾病不同临床表现也与靶位异质性有关,然而异质性机制仍有待于进一步研究和探讨。     

大疱性类天疱疮患者血清抗BP180自身抗体识别抗原表位的研究

目的分析大疱性类天疱疮(BP)患者血清抗BP180IgG和IgE自身抗体所识别的抗原表位。方法利用柱亲和层析的方法从10例BP患者血清中提取抗BP180-NC16A自身抗体,用免疫印迹技术对所获IgG和IgE自身抗体分别进行抗原表位鉴定。结果所有10例患者的自身抗体均识别aa507-aa532区域内(NC16A-2和NC16A-2.5)至少一个抗原表位,而且来自同一患者的IgG和IgE自身抗体在该区域所识别的表位完全一致。BP自身抗体与NC16A-1、NC16A-3和NC16A-4区域的结合率较低,与NC16A-5片段不结合。结论BP致病性自身抗体所识别的主要抗原表位可能位于BP180分子NC16A片段的aa507-aa532区域内。     

BP180NC16a-ELISA对大疱性类天疱疮血清学诊断的评价

目的 评价BP180NC16a-ELISA对大疱性类天疱疮血清学诊断的效能.方法 BP患者42例,对照组42例(其中正常人对照24例,天疱疮18例),在患者用药前采血,比较BP180NC16a-ELISA和盐裂试验免疫荧光(IIF)检测的结果.结果 用BP180NC16a-ELISA检测时,BP患者中有1例呈阴性反应,其敏感性为97.62%;正常人对照组中有1例呈阳性反应,其特异性为97.62%,且BP180NC16a-ELISA法的A值与IIF滴度之间无相关性.结论 BP180NC16a-ELISA在疾病初始阶段是检测血清中抗BP180抗体的有效方法.     

自身免疫性发疱病——类天疱疮线状IgA病和妊娠疱疹的掌跖受累

作者对下列自身免疫性发疱病——类天疱疮、线状 IgA 病、儿童慢性大疱性皮病(CBDC)和妊娠疱疹的掌跖水疱的发疱情况进行了调查:其中类天疱疮患者71例(年龄45～95岁,平均74岁);线状 IgA 病26例(年龄14～83岁,平均63岁),CBDC35例(年龄1～15岁,平均4岁);妊娠疱疹2例(年龄为16和29岁)。所有患者的诊断均经组织学和免疫荧光技术证实。     

大疱性类天疱疮患者血清总IgE与血清自身抗体的关系

目的 分析大疱性类天疱疮患者血清总IgE与抗BP180IgG抗体、抗BP230IgG抗体、抗表皮基底膜IgG抗体滴度(即间接免疫荧光滴度)的关系.方法 收集沈阳市第七人民医院2014年1月-2020年1月大疱性类天疱疮病例,进行回顾性分析,根据抗BP180IgG抗体、抗BP230IgG抗体阳性情况将患者分组,比较组间血...     

大疱性类天疱疮疾病严重程度与BP180抗体水平关系的研究

目的 研究大疱性类天疱疮患者临床疾病严重程度和BP180抗体滴度之间的关系.方法 用BP180NC16a-ELISA分别测定大疱性类天疱疮患者治疗前,病情缓解、糖皮质激素开始减量时和糖皮质激素减量至相当于泼尼松0.5 mg·kg^-1·d^-1时,体内BP180抗体滴度,观察其与患者病情严重程度的一致性.结果 在治疗前,19例大疱性类天疱疮患者的BP180 ELISA平均A值为0.520(0.832～0.372);在病情得到控制、糖皮质激素准备减量时,其BP180 ELISA平均A值为0.405(O.723～0.204);在病情缓解、糖皮质激素减至相当于泼尼松0.5 mg·kg^-1·d^-1时,其BP180 ELISA平均A值为0.215(0.412～0.093).结论 BP180抗体的滴度与大疱性类天疱疮患者疾病严重程度相关,是一种评估疾病病情的有用手段,也可对治疗的有效性作出评价.     

Detection of anti-BP180NC16a and anti-BP230 autoantibodies in blister fluid of patients with bullous pemphigoid: the first survey in Greece

Bullous pemphigoid (BP) is an acquired bullous disease with an increasing prevalence among elderly people worldwide, including in Greece. Blister formation in most patients with BP is caused by autoantibodies against structural components of the basement membrane zone of the skin, predominantly BP180NC16a and BP230 antigens on the hemidesmosome adhesion complex. Routine diagnostic methods such as histological examination and direct and indirect immunofluorescence are combined to determine diagnosis. In this study, an ELISA was used to measure levels of both anti-BP180NC16A and anti-BP230 autoantibodies in the blister fluid of 13 patients with newly diagnosed BP, before starting treatment. The aim of the study was to evaluate this method as a diagnostic tool in BP. Our results indicate that blister-fluid examination by ELISA can be a useful tool to diagnose bullous pemphigoid, especially in elderly patients who refuse biopsy or have poor venous access.     

Clinical significance of enzyme-linked immunosorbent assay for the detection of circulating anti-BP180 autoantibodies in patients with bullous pemphigoid

The NC16A domain of the 180-kDa bullous pemphigoid antigen (BP180) is the most immunogenic and, probably, pathogenic region in bullous pemphigoid (BP). In the present study, in order to determine whether serum level of circulating anti-BP180 autoantibodies is a valuable serum marker in BP, the immunoreactivity of sera against the NC16A domain of BP180 was measured using enzyme-linked immunosorbent assay (ELISA) in ten patients with BP. Serum levels of anti-BP180 autoantibodies correlated with the clinical course in BP patients, who received various therapeutic agents. The result suggests that this NC16A-ELISA is a useful method for evaluating the clinical course and efficacy of the therapy in patients with BP.     

Cicatricial pemphigoid differs from bullous pemphigoid and pemphigoid gestationis regarding the fine specificity of autoantibodies to the BP180 NC16A domain

Bullous pemphigoid (BP), pemphigoid (herpes) gestationis (PG), cicatricial pemphigoid (CP), and lichen planus pemphigoides (LPP) are autoimmune subepidermal bullous diseases that are characterized by circulating autoantibodies to the transmembrane hemidesmosomal protein BP180/type XVII collagen. Previous studies demonstrated that the majority of patients with BP, PG, and LPP show antibodies to an immunodominant, membrane-proximal non-collagenous domain (NC16A) on the extracellular portion of BP180. By the use of non-overlapping peptides of the NC16A domain, we previously demonstrated that autoantibodies from BP and PG patients mainly react with epitopes clustered within the N-terminus of this immunodominant site of BP180; antibodies from patients with LPP also recognized the C-terminal portion of NC16A. However, some of these results had been obtained indirectly by preadsorption studies. The aim of the present study was to analyze the fine specificity of IgG autoantibodies to NC16A in sera from patients with CP and to compare their reactivity with antibodies from BP, PG, and LPP patients using a series of new overlapping fragments covering the entire NC16A domain. We confirm that BP and PG sera mainly react with N-terminal epitopes of NC16A, whereas sera from patients with LPP also bind to C-terminal portions, of this domain. Interestingly, out of ten patients with CP, the sera of seven reacted with NC16A; within NC16A, these sera bound to both C-terminal fragments and an N-terminal epitope right next to the cell membrane. Our data demonstrate a heterogeneous binding pattern of autoantibodies to BP180 NC16A in patients with CP.     

IgG autoantibodies from a lichen planus pemphigoides patient recognize the NC16A domain of the bullous pemphigoid antigen 180

Lichen planus pemphigoides (LPP) most likely encompasses a heterogeneous group of subepidermal autoimmune blistering disorders occurring in association with lichen planus. We describe the case of a 49-year-old patient with features characteristic of LPP. Direct immunofluorescence microscopy studies demonstrated linear deposits of C3 along the cutaneous basement membrane, while circulating IgG autoantibodies directed against the epidermal side of skin separated by 1 M NaCl were detected. The patient's serum contained IgG autoantibodies immunoblotting a recombinant form of bullous pemphigoid antigen 180 (BP180), but not the COOH-terminus of BP230. By using deletion mutants, it was found that IgG reactivity was restricted to the NC16A domain of BP180, the region harboring the major antigenic sites targeted by IgG autoantibodies from patients with the bullous pemphigoid group of disorders. Our findings provide support to the idea that a subset of patients with LPP have a distinct form of bullous pemphigoid associated with lichen planus.     

Role of BP180NC16a-enzyme-linked immunosorbent assay (ELISA) in the diagnosis of bullous pemphigoid in China

Background Autoantibodies of bullous pemphigoid (BP) patients react with two components of the hemidesmosome of stratified epithelia: the BP antigen 230 (BP230) and the BP antigen 180 (BP180). Recently, strong evidence has been provided that autoantibodies to BP180 play a key role in subepidermal blister formation in BP patients, and NC16A contains an important antigen determinant of BP. Objective To study the role of BP180NC16a enzyme‐linked immunosorbent assay (BP180NC16a‐ELISA) in the diagnosis of BP in China. Methods Sera from BP patients (n = 42) and control subjects (normal controls, n = 24; pemphigus patients, n = 18) were measured by BP180NC16a‐ELISA. All BP sera were obtained at presentation from patients who had not received previous systemic treatment. The values of immunoglobulin G (IgG) antibody levels measured by ELISA were compared with those measured by indirect immunofluorescence (IIF) (gold standard for the diagnosis of BP) on salt‐split skin. Results Using BP180NC16a‐ELISA, 41 of the 42 BP sera were positive, whereas only one of the serum samples from 24 normal controls was positive and all the pemphigus sera showed a negative result. Thus, the sensitivity and specificity of BP180NC16a‐ELISA were both 97.62%. There was no correlation between the mean ELISA values and IIF titers. The ELISA and IIF results were further compared and analyzed using a 2 × 2 contingency table, which showed that they were not significantly different. Conclusions It is suggested that BP180NC16a‐ELISA is a useful tool for the diagnosis of BP.     

Serum levels of immunoglobulins G1 and G4 targeting the non‐collagenous 16A domain of BP180 reflect bullous pemphigoid activity and predict bad prognosis

Bullous pemphigoid (BP) is an autoimmune subepidermal bullous disease, and different immunoglobulin (Ig)G autoantibody subclasses may play different roles in the pathogenesis of BP. This study aims to evaluate the relationship between specific IgG subclasses and BP. Enzyme‐linked immunoassays (ELISA) were developed to test the IgG subclasses targeting the non‐collagenous 16A (NC16A) domain of BP180. A statistical analysis was carried out to assess the relationship of BP and IgG subclasses as well as other factors. The correlation coefficients between the ELISA scores for four IgG subclasses and disease severity scores were 0.586 for IgG, 0.441 for IgG1, 0.594 for IgG2, 0.345 for IgG3, and 0.448 for IgG4 before treatment. After treatment, the correlation coefficient was 0.376 for IgG, 0.522 for IgG1, 0.314 for IgG2, 0.582 for IgG3 and 0.503 for IgG4. Spearman's rank correlation coefficient was 0.801 for IgG1, 0.66 for IgG2, 0.575 for IgG3 and 0.463 for IgG4 between the ELISA scores of IgG subclasses and the disease severity score variation. The ELISA scores of IgG subclasses in patients with mucosal involvement were higher than those without. Survival analysis showed that sex, IgG1 and IgG4 were the independent predictors for BP. In conclusion, the serum levels of IgG1 and IgG4 targeting BP180NC16A were paralleled with disease severity in BP patients. IgG1 and IgG4 and sex were the independent prognostic factors for an early prognosis of BP.     

大疱性类天疱疮患者噬菌体抗体库的构建及抗BP180-NC16A抗体筛选

目的构建噬菌体抗体库并筛选抗BP180-NC16A抗体。方法以大疱性类天疱疮(BP)患者外周血淋巴细胞为基因来源,扩增多样性的轻链和重链Fd段基因,构建Fab段表面展示的噬菌体抗体库,用BP180分子的NC16A片段为抗原对抗体库进行筛选并对筛选得到的抗体用ELISA,W estern b lot和免疫荧光等方法进行鉴定。结果经过轻、重链基因的重组和转化,获得了库容为5×107的噬菌体抗体库。以BP180-NC16A抗原进行"亲和吸附—洗脱—扩增"淘筛,获得2株特异性抗体。结论利用噬菌体抗体库技术成功制备了抗BP180抗体,为深入研究BP自身抗体、探讨新的治疗策略奠定了基础。     

BP180NC16a-ELISA检测大疱性类天疱疮多中心随机双盲对照试验

目的 探讨BP180抗体诊断试剂盒检测大疱性类天疱疮（BP）的灵敏度和特异度。方法 多中心随机双盲平行对照临床试验。使用BP180抗体诊断试剂盒（ELISA）检测106例临床已经确诊的活动期BP患者和106例对照人群（含非BP的其他大疱性疾病以及硬皮病、银屑病、SLE、妊娠晚期孕妇、健康献血员等）血清样本,并与间接免疫荧光（IIF）试验进行灵敏度和特异度的对比。结果 106份BP患者血清样本中81份BP180抗体诊断试剂盒为阳性,其灵敏度为76.4%;83份抗表皮抗原抗体检测试剂盒（IIF法）为阳性,其灵敏度为78.3%。106份对照组血清标本中95份BP180抗体诊断试剂盒为阴性,其特异度为89.6%;102份抗表皮抗原抗体检测试剂盒为阴性,其特异度为96.2%。BP180抗体诊断试剂盒（ELISA）与对照试剂盒的灵敏度和特异度相比较,差异无统计学意义（P > 0.05）。结论 BP180抗体诊断试剂盒可作为诊断BP的一种辅助手段。