Using novel diagnostic antibodies to identify lymphocyte markers of rheumatic fever and heart disease.

Chad W. Euler, V. Fischetti
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Abstract

Acute rheumatic fever (ARF) is an autoimmune disease that occurs in a subset of patients as a delayed complication of an improperly treated throat infection with a rheumatogenic strain of Streptococcus pyogenes. ARF / Rheumatic heart disease is a leading cause of preventable cardiovascular morbidity and mortality in children worldwide, affecting >33 million people. A method of detecting children susceptible to ARF (3–5% of the total population) would have major global health and economic benefits. One potential ARF diagnostic is the IgM antibody, D8/17, which binds B cells from ARF patients of diverse ethnic groups and geographical locations at a higher % versus matched controls. While this antibody has had mixed results in the past, no group has identified the antigen that D8/17 binds. To aid in this endeavor, we used recombinant antibody engineering to produce new IgM and IgG1 versions of D8/17 that give more consistent results in our in vitrodiagnostic tests. These new derivatives were then utilized in a multi-omics approach to characterize the differences between immortalized B cell lines of ARF patients and controls. Western blot and MS/MS proteomic analyses of lymphocyte lysates identified cytoskeletal proteins from ARF B cells that cross-react more readily with our recombinant D8/17. RNA sequencing and microarray analysis of B cells from ARF patients versus controls confirmed our proteomic results. Further, we discovered differences in the gene expression of other cell surface proteins, kinases and signaling pathways in ARF B cells that bind these antibodies. We hope our analyses will help identify markers or genetic factors related to ARF development and pathogenesis, or aid in designing diagnostic assays for ARF susceptibility. Supported by a grant from the NIH /NIAD (SC2 1SC2AI134947-01)
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应用新型诊断抗体鉴定风湿热和心脏病的淋巴细胞标志物。
急性风湿热(ARF)是一种自身免疫性疾病,发生在一部分患者中,作为治疗不当的咽喉感染伴风湿性化脓性链球菌菌株的延迟并发症。ARF /风湿性心脏病是全球儿童可预防的心血管疾病和死亡的主要原因,影响超过3300万人。发现对ARF易感儿童(占总人口的3-5%)的方法将带来重大的全球健康和经济效益。一种潜在的ARF诊断是IgM抗体D8/17,与匹配对照相比,它结合来自不同种族和地理位置的ARF患者的B细胞的百分比更高。虽然这种抗体在过去有不同的结果,但没有小组确定D8/17结合的抗原。为了帮助这一努力,我们使用重组抗体工程来生产新的IgM和IgG1版本的D8/17,在我们的体外诊断测试中提供更一致的结果。这些新的衍生物随后被用于多组学方法,以表征ARF患者和对照组永生化B细胞系之间的差异。淋巴细胞裂解物的Western blot和MS/MS蛋白质组学分析发现,来自ARF B细胞的细胞骨架蛋白更容易与重组D8/17发生交叉反应。ARF患者与对照组B细胞的RNA测序和微阵列分析证实了我们的蛋白质组学结果。此外,我们发现ARF B细胞中结合这些抗体的其他细胞表面蛋白、激酶和信号通路的基因表达存在差异。我们希望我们的分析将有助于识别与ARF发展和发病机制相关的标记或遗传因素,或有助于设计ARF易感性的诊断方法。由NIH /NIAD资助(SC2 1SC2AI134947-01)
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