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2017 ; 199
(2
): 458-466
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Neutrophils Slow Disease Progression in Murine Lupus via Modulation of
Autoreactive Germinal Centers
#MMPMID28584005
Bird AK
; Chang M
; Barnard J
; Goldman BI
; Meednu N
; Rangel-Moreno J
; Anolik JH
J Immunol
2017[Jul]; 199
(2
): 458-466
PMID28584005
show ga
Neutrophils are well characterized as mediators of peripheral tissue damage in
lupus, but it remains unclear whether they influence loss of self-tolerance in
the adaptive immune compartment. Lupus neutrophils produce elevated levels of
factors known to fuel autoantibody production, including IL-6 and B cell survival
factors, but also reactive oxygen intermediates, which can suppress lymphocyte
proliferation. To assess whether neutrophils directly influence the progression
of autoreactivity in secondary lymphoid organs (SLOs), we characterized the
localization and cell-cell contacts of splenic neutrophils at several stages in
the progression of disease in the NZB/W murine model of lupus. Neutrophils
accumulate in SLO over the course of lupus progression, preferentially localizing
near T lymphocytes early in disease and B cells with advanced disease. RNA
sequencing reveals that the splenic neutrophil transcriptional program changes
significantly over the course of disease, with neutrophil expression of
anti-inflammatory mediators peaking during early-stage and midstage disease, and
evidence of neutrophil activation with advanced disease. To assess whether
neutrophils exert predominantly protective or deleterious effects on loss of B
cell self-tolerance in vivo, we depleted neutrophils at different stages of
disease. Neutrophil depletion early in lupus resulted in a striking acceleration
in the onset of renal disease, SLO germinal center formation, and autoreactive
plasma cell production. In contrast, neutrophil depletion with more advanced
disease did not alter systemic lupus erythematosus progression. These results
demonstrate a surprising temporal and context-dependent role for neutrophils in
restraining autoreactive B cell activation in lupus.