Wiskott–Aldrich Syndrome protein deficiency perturbs the homeostasis of B-cell compartment in humans

Wiskott–Aldrich Syndrome protein (WASp) regulates the cytoskeleton in hematopoietic cells and mutations in its gene cause the Wiskott–Aldrich Syndrome (WAS), a primary immunodeficiency with microthrombocytopenia, eczema and a higher susceptibility to develop tumors. Autoimmune manifestations, frequently observed in WAS patients, are associated with an increased risk of mortality and still represent an unsolved aspect of the disease. B cells play a crucial role both in immune competence and self-tolerance and defects in their development and function result in immunodeficiency and/or autoimmunity. We performed a phenotypical and molecular analysis of central and peripheral B-cell compartments in WAS pediatric patients. We found a decreased proportion of immature B cells in the bone marrow correlating with an increased presence of transitional B cells in the periphery. These results could be explained by the defective migratory response of WAS B cells to SDF-1α, essential for the retention of immature B cells in the BM. In the periphery, we observed an unusual expansion of CD21^low B-cell population and increased plasma BAFF levels that may contribute to the high susceptibility to develop autoimmune manifestations in WAS patients. WAS memory B cells were characterized by a reduced in vivo proliferation, decreased somatic hypermutation and preferential usage of IGHV4-34, an immunoglobulin gene commonly found in autoreactive B cells.In conclusion, our findings demonstrate that WASp-deficiency perturbs B-cell homeostasis thus adding a new layer of immune dysregulation concurring to the increased susceptibility to develop autoimmunity in WAS patients.     

自身免疫性肝病患者血清IgG4水平分析

探讨不同自身免疫性肝病患者血清免疫球蛋白G4（immunoglobulin G4,IgG4）水平差异,并分析不同血清IgG4水平的自身免疫性肝病患者临床特点的差异。方法收集自身免疫性肝病患者65例,其中自身免疫性肝炎（AIH）11例、原发性胆汁性肝硬化（primary biliary cirrhosis,PBC）47例及AIH与PBC重叠综合征7例。采用免疫散射比浊法检测三组患者血清IgG4水平,并分析三组之间血清IgG4水平的差异。根据血清IgG4水平的不同进行分组,分析不同血清IgG4水平的自身免疫性肝病患者临床特点的差异。对组间正态分布的计量资料的比较应用独立样本t检验,对非正态分布者采用Mann-Whitney U检验。计数资料的比较采用Fisher’s确切概率法。结果 AIH患者血清 IgG4水平为642.2 mg/L （97.7 mg/L~1687.0 mg/L）,高于 PBC 患者[153.9 mg/L（78.9 mg/L~400.3 mg/L）,P=0.076]及重叠综合征患者[229.9 mg/L（154.9 mg/L~417.9 mg/L）,P=0.388],无统计学差异。其中3例AIH患者血清IgG4水平异常升高（≥1350 mg/L）,与血清IgG4水平较低的8例AIH患者比,IgG4水平和IgG4/IgG比值较高,差异具有统计学意义（P〈0.05）;3例血清IgG4水平≥1350 mg/L的AIH患者均合并2型糖尿病,其中1例合并类风湿性关节炎,而其他8例AIH患者未合并其他自身免疫性或代谢性疾病;血清IgG4水平较高（IgG4水平≥200 mg/L）的14例PBC患者与IgG4水平较低的33例PBC患者比,血清总胆红素水平较高[（45.09±74.85）μmol/L 对（26.38±23.03）μmol/L,P=0.05]。结论与PBC及PBC与AIH 重叠综合征患者比,AIH患者血清IgG4水平较高。血清IgG4水平较高的AIH患者可能较易合并其他自身免疫性或代谢性疾病。     

Ulcerative Colitis and Immunoglobulin G4

Background/Aims

Ulcerative colitis (UC) is sometimes associated with autoimmune pancreatitis (AIP). Infiltration of immunoglobulin G4 (IgG4)-positive plasma cells is sometimes detected in the colonic mucosa of AIP or UC patients. This study aimed to clarify the relation between UC and IgG4.

Methods

Associations with UC were reviewed in 85 AIP patients. IgG4 immunostaining was performed on biopsy specimens from the colonic mucosa of 14 AIP and 32 UC patients.

Results

UC was confirmed in two cases (type 1 AIP, n=1; suspected type 2 AIP, n=1). Abundant infiltration of IgG4-positive plasma cells in the colonic mucosa was detected in the case of suspected type 2 AIP with UC and two cases of type 1 AIP without colitis. Abundant infiltration of IgG4-positive plasma cells was detected in 10 UC cases (IgG4-present, 31%). Although 72% of IgG4-absent UC patients showed mild disease activity, 70% of IgG4-present patients showed moderate to severe disease activity (p<0.05).

Conclusions

UC is sometimes associated with AIP, but it seems that UC is not a manifestation of IgG4-related disease. Infiltration of IgG4-positive plasma cells is sometimes detectable in the colonic mucosa of UC patients and is associated with disease activity.     

The use of immunohistochemistry for IgG4 in the diagnosis of autoimmune pancreatitis: A systematic review and meta-analysis

BackgroundThe diagnosis of autoimmune pancreatitis (AIP) remains challenging, especially when serum IgG4 is normal or imaging features are indeterminate. We performed a systematic review and meta-analysis to evaluate the performance of IgG4 immunostaining of pancreatic, biliary, and ampullary tissues as a diagnostic aid for AIP.MethodsA comprehensive literature search of the PubMed, EMBASE, and Ovid MEDLINE databases was conducted until February 2020. The methodological quality of each study was assessed according to the Quality Assessment of Diagnostic Accuracy Studies checklist. A random-effects model was used to summarize the diagnostic odds ratio and other measures of accuracy.ResultsThe meta-analysis included 20 studies comprising 346 patients with AIP and 590 patients with other pancreatobiliary diseases, including 371 pancreatobiliary malignancies. The summary estimates for tissue IgG4 in discriminating AIP and controls were as follows: diagnostic odds ratio 38.86 (95% confidence interval (CI), 18.70–80.75); sensitivity 0.64 (95% CI, 0.59–0.69); specificity 0.93 (95% CI, 0.91–0.95). The area under the curve was 0.939 for tissue IgG4 in discriminating AIP and controls. Subgroup analysis revealed no significant difference in diagnostic accuracy according to control groups (pancreatobiliary cancer versus other chronic pancreatitis) and sampling site (pancreas versus bile duct/ampulla).ConclusionsCurrent data demonstrate that IgG4 immunostaining of pancreatic, biliary, and ampullary tissue has a high specificity but moderate sensitivity for diagnosing AIP. IgG4 immunostaining may be useful in supporting a diagnosis of AIP when AIP is clinically suspected, but a combination of imaging and serology does not provide a conclusive diagnosis.     

不同工艺制备的静注人免疫球蛋白产品质量对比研究

目的 对比用低温乙醇蛋白分离工艺制备的静注人免疫球蛋白（pH4）和两步阴离子交换层析制备的静注人免疫球蛋白（10%）产品质量指标,分析制备工艺对产品质量的影响。方法 对2种工艺的产品进行IgA含量、分子大小分布、抗-HBs效价、蛋白空间结构、Fc片段活性、抗体谱和IgG亚型分布等指标的检测和对比分析。结果 两步阴离子交换层析制备的静注人免疫球蛋白的IgA含量（5.30 μg/ml）明显低于低温乙醇分离制备的（281.95 μg/ml）,而分子大小分布、抗-HBs效价、蛋白空间结构、Fc片段活性、抗体谱、亚型分布指标没有明显差别。结论 两步阴离子交换层析制备的静注人免疫球蛋白（10%）具有更高的安全性。     

Breastfeeding: An overview of oral and general health benefits

Background

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Breastfeeding is the reference against which alternative infant feeding models must be measured with regard to growth, development and other health outcomes. Although not a systematic review, this report provides an update for dental professionals, including an overview of general and oral health–related benefits associated with breastfeeding.Types of Studies ReviewedThe authors examined the literature regarding general health protections that breastfeeding confers to infants and mothers and explored associations between breastfeeding, occlusion in the primary dentition and early childhood caries. To accomplish these goals, they reviewed systematic reviews when available and supplemented them with comparative studies and with statements and reports from major nongovernmental and governmental organizations.ResultsWhen compared with health outcomes among formula-fed children, the health advantages associated with breastfeeding include a lower risk of acute otitis media, gastroenteritis and diarrhea, severe lower respiratory infections, asthma, sudden infant death syndrome, obesity and other childhood diseases and conditions. Evidence also suggests that breastfed children may develop a more favorable occlusion in the primary dentition. The results of a systematic review in which researchers examined the relationship between breastfeeding and early childhood caries were inconclusive.Conclusions and Clinical ImplicationsThe American Academy of Pediatric Dentistry, Chicago, suggests that parents gently clean infants' gums and teeth after breastfeeding. The American Academy of Pediatrics, Elk Grove Village, Ill., recommends that breastfeeding should be exclusive for about the first six months of life and should continue, with the introduction of appropriate complementary foods, to at least age 12 months or beyond, as desired by mother and child. Dentists and staff members can take steps to ensure they are familiar with the evidence and guidelines pertaining to breastfeeding and to oral health. They are encouraged to follow the surgeon general's recommendations to promote and support optimal breastfeeding and oral health practices among their patients.     

支原体肺炎患儿血清体液免疫检测的临床研究

目的探讨支原体肺炎(MP)患儿体液免疫IgG、IgM、IgA在其发病机制中的作用。方法分析我院收治的36例支原体肺炎患儿作为病例组,同期42例健康患儿作为对照组。检测两组小儿血清免疫球蛋白IgG、IgM、IgA含量,并进行比较。结果支原体肺炎患儿血清IgG、IgM显著高于对照组,P<0.0001,P<0.0001;血清IgA水平两组比较差别无统计学意义,P=0.74。结论支原体肺炎病儿体液免疫IgG、IgM应答增强,在其发病机制中起重要作用。     

Detecting viruses by using salivary diagnostics

BackgroundDiagnostics that involve the use of oral fluids have become increasingly available commercially in recent years and are of particular interest because of their relative ease of use, low cost and noninvasive collection of oral fluid for testing.Types of Studies ReviewedThe authors discuss the use of salivary diagnostics for virus detection with an emphasis on rapid detection of infection by using point-of-care devices. In particular, they review salivary diagnostics for human immunodeficiency virus, hepatitis C virus and human papillomavirus. Oral mucosal transudate contains secretory immunoglobulin (Ig) A, as well as IgM and IgG, which makes it a good source for immunodiagnostic-based devices.Clinical ImplicationsBecause patients often visit a dentist more regularly than they do a physician, there is increased discussion in the dental community regarding the need for practitioners to be aware of salivary diagnostics and to be willing and able to administer these tests to their patients.     

人免疫球蛋白联合更昔洛韦治疗小儿腺病毒肺炎的临床研究

目的探讨静注人免疫球蛋白(pH 4)联合注射用更昔洛韦治疗小儿腺病毒肺炎的临床疗效。方法选择2014年6月—2016年12月华中科技大学同济医学院附属武汉儿童医院收治的腺病毒肺炎患儿90例,所有患儿按随机数字表法随机分为对照组和治疗组,每组各45例。对照组静脉滴注注射用更昔洛韦,5 mg/kg,滴注时间1 h,2次/d。治疗组在对照组基础上静脉滴注静注人免疫球蛋白(pH 4),400 mg/kg,1次/d。两组患儿均连续治疗14 d。观察两组的临床疗效,比较两组的临床症状、肿瘤坏死因子-α(TNF-α)、分泌型磷脂酶A2(sPLA2)、克拉拉细胞分泌蛋白(CCSP)和白细胞介素-1(IL-1)水平情况。结果治疗后,对照组和治疗组的总有效率分别为71.11%、95.56%,两组比较差异有统计学意义(P0.05)。治疗后,治疗组退热时间、咳嗽停止时间、咽痛消失时间、肺部湿啰音消失时间和住院时间均明显短于对照组,两组比较差异有统计学意义(P0.05)。治疗后,两组血清TNF-α、sPLA2、CCSP和IL-1水平均明显降低,同组治疗前后比较差异有统计学意义(P0.05);且治疗组这些观察指标明显低于对照组,两组比较差异具有统计学意义(P0.05)。结论静注人免疫球蛋白(pH 4)联合注射用更昔洛韦治疗小儿腺病毒肺炎具有较好的临床疗效,可改善临床症状,降低TNF-α、sPLA2、CCSP和IL-1水平,具有一定临床推广应用价值。     

反相酶联免疫斑点法检测脐血B细胞免疫球蛋白分泌细胞的数量

以羊抗人ＩｇＧ－Ｆ（ａｂ’２）抗体作固相色免疫吸附剂，以硝酸纤维素膜为载体，借助于ＨＲＰ－亲和素建立了检测分泌免疫球蛋白分的细胞数的反相酶联免疫斑点法