A&R:IgG抗瓜氨酸蛋白抗体可变域糖基化在类风湿性关节炎发作前增加并在此后稳定

2022-07-22 MedSci原创 MedSci原创

IgG抗瓜氨酸蛋白抗体可变域糖基化(IgG ACPA VDG)的丰度随着类风湿性关节炎(RA)发作而增加,并与ACPA反应的成熟度相关。RA发病时VDG水平较低与长期无药物缓解(DFR)相关。

目的:类风湿性关节炎(RA)的自身免疫反应以抗瓜氨酸蛋白抗体(ACPA)的存在为标志。IgG ACPA的一个显著特征是N-连接聚糖在可变结构域中表达丰富。然而,ACPA可变结构域糖基化(VDG)跨疾病阶段的存在及其对治疗的反应却鲜为人知。为了了解其动态,该研究团队调查了来自不同临床阶段个体的1498个样本中IgG ACPA VDG的丰度。

方法:研究人员使用液相色谱分析了来自日本、加拿大、荷兰和瑞典的7个不同队列的IgG ACPA VDG谱。评估了106名健康个体、228名症状前RA患者、277名关节痛患者、307名新发/早期RA患者和117名接受预设治疗方案的RA患者。此外,测量了234RA 患者样本中的VDG,这些患者在长达16年的随访期间实现了或未实现长期无药物缓解(DFR)

结果:IgG ACPA VDG在疾病发作时显著增加(P < 0.0001),并且与诊断前的ACPA水平和表位扩散(表位扩散指对与致病表位不同且不发生交叉反应的表位产生免疫反应)有关。在已确诊的RA患者中观察到VDG略有增加,治疗影响中等(P = 0.007)。在后来达到DFR的患者中,IgG ACPA VDGRA发作时已经降低。

结论:IgG ACPA VDG的丰度随着 RA发作而增加,并与ACPA反应的成熟度相关。虽然 IgG ACPA VDG水平在既定疾病中相当稳定,但RA发病时VDG水平较低与DFR相关。尽管潜在的生物学机制仍然难以捉摸,但该研究的数据支持以下概念,即VDG与疾病前期ACPA反应的扩展有关,并有助于疾病的发展。

出处:Kissel T, Hafkenscheid L, Wesemael TJ, et al. IgG Anti-Citrullinated Protein Antibody Variable Domain Glycosylation Increases Before the Onset of Rheumatoid Arthritis and Stabilizes Thereafter: A Cross-Sectional Study Encompassing ~1,500 Samples. Arthritis Rheumatol. 2022 Jul;74(7):1147-1158. doi: 10.1002/art.42098. Epub 2022 May 28. PMID: 35188715.

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    2022-07-23 lmm397
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    2022-07-23 lfyang
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