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2015 ; 290
(20
): 12858-67
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Thrombospondin-1 (TSP1)-producing B cells restore antigen (Ag)-specific immune
tolerance in an allergic environment
#MMPMID25839231
Yang G
; Geng XR
; Liu ZQ
; Liu JQ
; Liu XY
; Xu LZ
; Zhang HP
; Sun YX
; Liu ZG
; Yang PC
J Biol Chem
2015[May]; 290
(20
): 12858-67
PMID25839231
show ga
Restoration of the antigen (Ag)-specific immune tolerance in an allergic
environment is refractory. B cells are involved in immune regulation. Whether B
cells facilitate the generation of Ag-specific immune tolerance in an allergic
environment requires further investigation. This paper aims to elucidate the
mechanism by which B cells restore the Ag-specific immune tolerance in an
allergic environment. In this study, a B cell-deficient mouse model was created
by injecting an anti-CD20 antibody. The frequency of tolerogenic dendritic cell
(TolDC) was assessed by flow cytometry. The levels of cytokines were determined
by enzyme-linked immunosorbent assay. The expression of thrombospondin-1 (TSP1)
was assessed by quantitative real-time RT-PCR, Western blotting, and
methylation-specific PCR. The results showed that B cells were required in the
generation of the TGF-?-producing TolDCs in mice. B cell-derived TSP1 converted
the latent TGF-? to the active TGF-? in DCs, which generated TGF-?-producing
TolDCs. Exposure to IL-13 inhibited the expression of TSP1 in B cells by
enhancing the TSP1 gene DNA methylation. Treating food allergy mice with
Ag-specific immunotherapy and IL-13 antagonists restored the generation of TolDCs
and enhanced the effect of specific immunotherapy. In conclusion, B cells play a
critical role in the restoration of specific immune tolerance in an allergic
environment. Blocking IL-13 in an allergic environment facilitated the generation
of TolDCs and enhanced the therapeutic effect of immunotherapy.