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Erschienen in: Journal of Clinical Immunology 1/2007

01.01.2007 | Original Paper

Similar CD19 Dysregulation in Two Autoantibody-Associated Autoimmune Diseases Suggests a Shared Mechanism of B-Cell Tolerance Loss

verfasst von: DONNA A. CULTON, MATILDA W. NICHOLAS, DONNA O. BUNCH, QUAN LI ZHEN, THOMAS B. KEPLER, MARY ANNE DOOLEY, CHANDRA MOHAN, PATRICK H. NACHMAN, STEPHEN H. CLARKE

Erschienen in: Journal of Clinical Immunology | Ausgabe 1/2007

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We report here that dysregulation of CD19, a coreceptor that augments B-cell receptor (BCR) signaling, occurs at two B-cell differentiative stages in patients with systemic lupus erythematosus (SLE) and antineutrophil cytoplasmic autoantibody (ANCA) associated small vessel vasculitis (SVV). The naïve B cells of nearly all SLE and ANCA-SVV patients express ∼20% less CD19 than healthy control (HC) B cells. In contrast, a subset of memory B cells of some SLE and ANCA-SVV Pts (25–35%) express two to fourfold more CD19 than HC B cells. These CD19hi memory B cells are activated and exhibit evidence of antigen selection. Proteome array analysis of 67 autoantigens indicates that CD19hi SLE Pts exhibit a distinct autoantibody profile characterized by high levels of antibodies to small nuclear ribonucleoproteins and low levels of antiglomerular autoantibodies. These findings have implications for autoreactive B-cell activation and suggest a shared mechanism of B-cell tolerance loss in these two diseases.
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Metadaten
Titel
Similar CD19 Dysregulation in Two Autoantibody-Associated Autoimmune Diseases Suggests a Shared Mechanism of B-Cell Tolerance Loss
verfasst von
DONNA A. CULTON
MATILDA W. NICHOLAS
DONNA O. BUNCH
QUAN LI ZHEN
THOMAS B. KEPLER
MARY ANNE DOOLEY
CHANDRA MOHAN
PATRICK H. NACHMAN
STEPHEN H. CLARKE
Publikationsdatum
01.01.2007
Erschienen in
Journal of Clinical Immunology / Ausgabe 1/2007
Print ISSN: 0271-9142
Elektronische ISSN: 1573-2592
DOI
https://doi.org/10.1007/s10875-006-9051-1

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