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2016 ; 196
(11
): 4477-86
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STAT3 Signaling in B Cells Is Critical for Germinal Center Maintenance and
Contributes to the Pathogenesis of Murine Models of Lupus
#MMPMID27183592
Ding C
; Chen X
; Dascani P
; Hu X
; Bolli R
; Zhang HG
; Mcleish KR
; Yan J
J Immunol
2016[Jun]; 196
(11
): 4477-86
PMID27183592
show ga
Ab maturation as well as memory B and plasma cell differentiation occur primarily
in the germinal centers (GCs). Systemic lupus erythematosus (SLE) may develop as
a result of enhanced GC activity. Previous studies have shown that the
dysregulated STAT3 pathway is linked to lupus pathogenesis. However, the exact
role of STAT3 in regulating SLE disease progression has not been fully
understood. In this study, we demonstrated that STAT3 signaling in B cells is
essential for GC formation and maintenance as well as Ab response. Increased cell
apoptosis and downregulated Bcl-xL and Mcl-1 antiapoptotic gene expression were
found in STAT3-deficient GC B cells. The follicular helper T cell response
positively correlated with GC B cells and was significantly decreased in
immunized B cell STAT3-deficient mice. STAT3 deficiency also led to the defect of
plasma cell differentiation. Furthermore, STAT3 deficiency in autoreactive B
cells resulted in decreased autoantibody production. Results obtained from B cell
STAT3-deficient B6.MRL/lpr mice suggest that STAT3 signaling significantly
contributes to SLE pathogenesis by regulation of GC reactivity, autoantibody
production, and kidney pathology. Our findings provide new insights into the role
of STAT3 signaling in the maintenance of GC formation and GC B cell
differentiation and identify STAT3 as a novel target for treatment of SLE.