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2018 ; 4
(7
): eaas9944
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BAFF inhibition attenuates fibrosis in scleroderma by modulating the regulatory
and effector B cell balance
#MMPMID30009261
Matsushita T
; Kobayashi T
; Mizumaki K
; Kano M
; Sawada T
; Tennichi M
; Okamura A
; Hamaguchi Y
; Iwakura Y
; Hasegawa M
; Fujimoto M
; Takehara K
Sci Adv
2018[Jul]; 4
(7
): eaas9944
PMID30009261
show ga
Systemic sclerosis (SSc) is an autoimmune disease characterized by skin and lung
fibrosis. More than 90% of patients with SSc are positive for autoantibodies. In
addition, serum B cell activating factor (BAFF) level is correlated with SSc
severity and activity. Thus, B cells are considered to play a pathogenic role in
SSc. However, there are two opposing subsets: regulatory B cells (Bregs) and
effector B cells (Beffs). Interleukin-10 (IL-10)-producing Bregs negatively
regulate the immune response, while IL-6-producing Beffs positively regulate it.
Therefore, a protocol that selectively depletes Beffs would represent a potent
therapy for SSc. The aims of this study were to investigate the roles of Bregs
and Beffs in SSc and to provide a scientific basis for developing a new treatment
strategy targeting B cells. A bleomycin-induced scleroderma model was induced in
mice with a B cell-specific deficiency in IL-6 or IL-10. We also examined whether
BAFF regulates cytokine-producing B cells and its effects on the scleroderma
model. IL-6-producing Beffs increased in number and infiltrated the inflamed skin
in the scleroderma model. The skin and lung fibrosis was attenuated in B
cell-specific IL-6-deficient mice, whereas B cell-specific IL-10-deficient mice
showed more severe fibrosis. In addition, BAFF increased Beffs but suppressed
Bregs. Furthermore, BAFF antagonist attenuated skin and lung fibrosis in the
scleroderma model with reduction of Beffs but not of Bregs. The current study
indicates that Beffs play a pathogenic role in the scleroderma model, while Bregs
play a protective role. BAFF inhibition is a potential therapeutic strategy for
SSc via alteration of B cell balance.