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2014 ; 193
(11
): 5515-24
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DBC1 is a suppressor of B cell activation by negatively regulating alternative
NF-?B transcriptional activity
#MMPMID25362179
Kong S
; Thiruppathi M
; Qiu Q
; Lin Z
; Dong H
; Chini EN
; Prabhakar BS
; Fang D
J Immunol
2014[Dec]; 193
(11
): 5515-24
PMID25362179
show ga
CD40 and BAFFR signaling play important roles in B cell proliferation and Ig
production. In this study, we found that B cells from mice with deletion of Dbc1
gene (Dbc1(-/-)) show elevated proliferation, and IgG1 and IgA production upon in
vitro CD40 and BAFF, but not BCR and LPS stimulation, indicating that DBC1
inhibits CD40/BAFF-mediated B cell activation in a cell-intrinsic manner.
Microarray analysis and chromatin immunoprecipitation experiments reveal that
DBC1 inhibits B cell function by selectively suppressing the transcriptional
activity of alternative NF-?B members RelB and p52 upon CD40 stimulation. As a
result, when immunized with nitrophenylated-keyhole limpet hemocyanin, Dbc1(-/-)
mice produce significantly increased levels of germinal center B cells, plasma
cells, and Ag-specific Ig. Finally, loss of DBC1 in mice leads to higher
susceptibility to experimental autoimmune myasthenia gravis. Our study identifies
DBC1 as a novel regulator of B cell activation by suppressing the alternative
NF-?B pathway.