BAFF inhibition attenuates fibrosis in scleroderma by modulating the regulatory and effector B cell balance

Science Advances
Takashi MatsushitaKazuhiko Takehara

Abstract

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...Continue Reading

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Citations

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Methods Mentioned

BETA
enzyme-linked immunosorbent assay
flow cytometry
fluorescence-activated cell sorting
FACS
ELISA
Assay
dissection
reverse transcription PCR

Software Mentioned

FlowJo
GraphPad
GraphPad Prism
Tree Star

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