Hilar cholangiocarcinoma with extensive immunoglobulin G4 reaction

Immunoglobulin G4 (IgG4)-related disease (IgG4-RD) is a systemic fibroinflammatory disorder that can involve multiple organs. It is often challenging to distinguish IgG4-related sclerosing cholangitis (IgG4-SC) from cholangiocarcinoma because of overlap in their clinical findings. A 75-year-old man presented to a hospital for a detailed examination of the elevation of some biliary enzymes. Radiographic examination revealed segmental bile duct with wall thickening of the common hepatic bile duct, and dilation of the peripheral branches. Transampullary biopsy showed a non-specific inflammatory reaction with several IgG4-positive cell infiltrations. There were no signs of malignancy. The liver biopsy showed bile duct injury accompanied by IgG4-positive cell infiltration. We then performed bile duct biopsy and finally diagnosed the patient with cholangiocarcinoma. We should remember that the IgG4 reaction is neither completely sensitive nor specific for IgG4-RD and avoid resting solely on the IgG4 reaction to precisely distinguish IgG4-SC from cholangiocarcinoma.     

Anti‐SARS‐CoV‐2 IgG antibody levels among Thai healthcare providers receiving homologous and heterologous COVID‐19 vaccination regimens

BackgroundWe examined SARS‐CoV‐2 anti‐spike 1 IgG antibody levels following COVID‐19 vaccination (AstraZeneca [AZ], Sinovac [SV], Pfizer‐BioNTech [PZ]) among Thai healthcare providers.MethodsBlood specimens were tested using enzyme‐linked immunosorbent assay. We analyzed seven vaccination regimens: (1) one dose of AZ or SV, (2) two doses of homologous (2AZ, 2SV) or heterologous (1AZ + 1PZ) vaccines, and (3) three doses of heterologous vaccines (2SV + 1AZ, 2SV + 1PZ). Differences in antibody levels were assessed using Kruskal–Wallis statistic, Mann–Whitney test, or Wilcoxon matched‐pairs signed‐rank test. Antibody kinetics were predicted using fractional polynomial regression.ResultsThe 563 participants had median age of 39 years; 92% were female; 74% reported no underlying medical condition. Antibody levels peaked at 22–23 days in both 1AZ and 2SV vaccinees and dropped below assay''s cutoff for positive (35.2 binding antibody units/ml [BAU/ml]) in 55 days among 1AZ vaccinees compared with 117 days among 2SV vaccinees. 1AZ + 1PZ vaccination regimen was highly immunogenic (median 2279 BAU/ml) 1–4 weeks post vaccination. 2SV + 1PZ vaccinees had significantly higher antibody levels than 2SV + 1AZ vaccinees 4 weeks post vaccination (3423 vs. 2105 BAU/ml; p‐value < 0.01), and during weeks 5–8 (3656 vs. 1072 BAU/ml; p‐value < 0.01). Antibodies peaked at 12–15 days in both 2SV + 1PZ and 2SV + 1AZ vaccinees, but those of 2SV + 1AZ declined more rapidly and dropped below assay''s cutoff in 228 days while those of 2SV + 1PZ remained detectable.Conclusions1AZ + 1PZ, 2SV + 1AZ, and 2SV + 1PZ vaccinees had substantial IgG levels, suggesting that these individuals likely mounted sufficient anti‐S1 IgG antibodies for possible protection against SARS‐CoV‐2 infection.     

IgG4-related Disease with a Cardiac Mass Causing Cerebral Infarction

Immunoglobulin G4-related disease (IgG4-RD) is a systemic inflammatory disease characterized by infiltration of extensive IgG4-positive plasma cells and lymphocytes. Although IgG4-RD has been observed in almost all organs, it rarely affects the myocardium. Cardiovascular lesions of IgG4-RD appear as aortic (aortic aneurysm and aortitis) and pericardial (constrictive pericarditis) lesions as well as pseudotumors around the coronary arteries. We herein report a case of IgG4-RD with a cardiac mass in the right atrium involving a sinus node. This condition caused arrhythmia and repeated strokes. We successfully treated the patient through resection of the cardiac mass, catheter ablation and immunosuppressive therapy.     

不育男性精浆抗流行性腮腺炎病毒抗体测定结果分析

目的观察流行性腮腺炎病毒抗体在男性生殖道分泌液中的分布状况,探讨其对男性生殖功能的影响。方法采用微孔板酶联免疫吸附法(ELISA)对30例生育男性和110例不育症患者精浆中抗流行性腮腺炎病毒抗体免疫球蛋白G(IgG)、免疫球蛋白M(IgM)进行了检测。结果不育症患者精浆中腮腺炎病毒IgG阳性者61例(55.5%),抗体平均水平为367 U/ml;IgM阳性者9例(8.2%),抗体平均水平为56U/ml;IgG和IgM同时阳性者4例(3.6%);生育组仅6例(20.0%)IgG呈现阳性,抗体平均水平为148 U/ml,明显低于不育症者。不育症组IgG阳性率以无精子症组最高,IgM阳性率以少精子症组最高。精浆中IgG在精子活动力正常组和不良组、精浆AsAb阳性组和AsAb阴性组之间存在显著性差异(P<0.05)。IgM在WBC精液组和非WBC精液组、精浆AsAb阳性组和AsAb阴性组之间存在显著性差异(P<0.05或P<0.01)。IgG和IgM同时阳性在WBC精液组和非WBC精液组之间存在显著性差异(P<0.05)。结论精浆中腮腺炎病毒IgG阳性率与精子密度呈正相关。男性感染腮腺炎病毒所致的睾丸炎,可以引起精子数量严重减少或无精子症,并且可以影响精子的活动力,对以后生育功能可能带来不良的影响。     

Changes in Anti-SARS-CoV-2 IgG Subclasses over Time and in Association with Disease Severity

IgG is the most prominent marker of post-COVID-19 immunity. Not only does this subtype mark the late stages of infection, but it also stays in the body for a timespan of at least 6 months. However, different IgG subclasses have different properties, and their roles in specific anti-COVID-19 responses have yet to be determined. We assessed the concentrations of IgG1, IgG2, IgG3, and IgG4 against different SARS-CoV-2 antigens (N protein, S protein RBD) using a specifically designed method and samples from 348 COVID-19 patients. We noted a statistically significant association between severity of COVID-19 infection and IgG concentrations (both total and subclasses). When assessing anti-N protein and anti-RBD IgG subclasses, we noted the importance of IgG3 as a subclass. Since it is often associated with early antiviral response, we presumed that the IgG3 subclass is the first high-affinity IgG antibody to be produced during COVID-19 infection.     

手足口病患儿免疫球蛋白IgG亚类和补体C3、C4及C反应蛋白水平分析

目的:探讨手足口病患儿免疫球蛋白IgG亚类和补体C3、C4及C反应蛋白(CRP)水平的变化及临床意义。方法:选取重型手足口病患儿103例作为重型组,普通手足口病患儿301例作为普通组,另选取同期健康体检的正常儿童50名作为对照组,检测3组免疫球蛋白IgG亚类和补体C3、C4及CRP水平。结果:重型组IgG1、IgG3和补体C3、C4水平明显低于对照组和普通组(P<0.01),CRP水平均明显高于对照组和普通组(P<0.01),普通组IgG1、IgG2、IgG3、IgG4和补体C3、C4及CRP水平与对照组差异均无统计学意义(P>0.05)。结论:重型手足口病患儿体液免疫应答存在异常,患儿可在病毒感染的基础上继发细菌感染,联合检测免疫球蛋白IgG亚类和补体C3、C4及CRP水平对手足口病患儿病情进展具有一定的临床指导意义。     

三种方法检测孕妇血清IgG抗A(B)效价的结果比较

目的:比较经典法、改良法和微柱凝胶法抗人球蛋白试验检测孕妇血清中IgG抗A(B)效价的差异。方法:用经典法、改良法和微柱凝胶法分别检测136例孕妇血清中IgG抗A(B)效价,计算其阳性率,再以经典法为标准计算改良法和微柱凝胶法的特异性和敏感性。结果:经典法、改良法和微柱凝胶法检测孕妇血清中IgG抗A效价的阳性率分别为22.8%、25.0%和33.8%,IgG抗B效价的阳性率分别为19.1%、20.5%和31.6%。与经典法比较,改良法敏感性为98.1%,特异性为96.3%;微柱凝胶法敏感性为100%,特异性为63.4%。经统计学比较,,改良法和经典法的阳性率无统计学意义(P>0.05),而微柱凝胶法阳性率明显高于经典法(P<0.01)。结论:改良法和经典法检测孕妇血清中IgG抗A(B)效价的结果具有良好的一致性,而微柱凝胶法阳性率明显高于经典法,需重新设定临床意义决定值。     

某医学院大学新生弓形虫感染调查

目的:了解高校新生弓形虫感染情况,为预防该病提供科学依据。方法:采用ELISA法对某医学院2009级入学466名新生进行弓形虫IgG、IgM抗体检测。结果:弓形虫IgG抗体阳性率男生为6.08%,女生为5.93%,差异无统计学意义(χ2=1.29,P>0.05);IgM抗体阳性率男生为5.65%,女生为4.66%,差异无统计学意义(χ2=1.82,P>0.05)。来自农村和城镇的新生IgG抗体阳性率分别为5.14%、7.04%,有显著差异(χ2=5.81,P<0.05);IgM抗体阳性率分别为3.95%、6.57%,有显著差异(χ2=6.39,P<0.05)。结论:来自城镇与农村的学生弓形虫感染率不同,城镇高于农村。     

小鼠IgG抗体的制备——IgG—SPA菌体免疫法

本文介绍制备小鼠IgG抗体的一种简便方法,即IgG-SPA菌体免疫法。首先制备10％(w/v)Cowan I 株菌体稳定液,按一定比例与正常小鼠血清制备IgG-SPA菌体免疫原。然后以9—12亿/ml菌体免疫原静脉注射于年青健康家兔,数次免疫后,即得兔抗小鼠IgG抗体(RAM-IgG),其血清效价达1:32～1:64(双扩法);其抗体纯度高,与正常小鼠血清只出现一条沉淀线。经鉴定,其血清不含有鼠IgM抗体。本文又把该法与IgG常规乳化佐剂免疫法作了比较。     

抗绿脓杆菌Ⅰ群10115株单克隆抗体杂交瘤细胞株的筛选和检定

作者用SP2/0骨髓瘤细胞与绿脓杆菌Ⅰ群10115株免疫的BALB/c鼠脾细胞融合获得三株连续分泌抗绿脓杆菌单克隆抗体的杂交瘤细胞株C_3、D_1和D_3,对其中C_3杂交瘤株作了PHA、ELISA、IFA检定分析,证明能分泌高效价特异的单克隆抗体。PAGE结果出现一特殊区带。单克隆抗体亚类检定结果为IgM及IgG_1。