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2015 ; 4
(ä): 354-368
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Antibody Reactivity of B Cells in Lupus Patients with Increased Disease Activity
and ARID3a Expression
#MMPMID28580178
Ward JM
; James JA
; Zhao YD
; Webb CF
Antibodies (Basel)
2015[Dec]; 4
(ä): 354-368
PMID28580178
show ga
Earlier studies showed that the DNA-binding protein, Bright/ARID3a bound to a
subset of human and mouse immunoglobulin heavy chain promoters where it enhanced
expression. Indeed, mice with transgenic expression of ARID3a in all B
lymphocytes have expanded MZ B cells and produce anti-nuclear antibodies (ANAs).
Consistent with our findings in mice, we observed that human systemic lupus
erythematosus (SLE) patients had expanded numbers of peripheral blood ARID3a(+) B
cells that were associated with increased disease activity (p = 0.0038). We
hypothesized that ARID3a(+) naïve B cells would eventually produce
autoantibodies, explaining associations between ARID3a expression and disease
activity in lupus. Unlike healthy controls, ARID3a was expressed in the naïve B
cell population in SLE patients, and we hypothesized that these might represent
expansions of autoreactive cells. Therefore, monoclonal antibodies were generated
from single-sorted naïve B cells derived from patients with normal (ARID3a(N))
and high (ARID3a(H)) numbers of ARID3a(+) B cells. We found that ARID3a
expression did not correlate with autoantibody expression. Furthermore, measures
of antigen specificities of autoreactive antibodies did not reveal skewing toward
particular proteins. These data suggest that the association of increased disease
activity in SLE with numbers of ARID3a(+) B lymphocytes may be mediated by an
antibody-independent mechanism.