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2015 ; 16
(6
): 753-68
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English Wikipedia
LKB1 inhibition of NF-?B in B cells prevents T follicular helper cell
differentiation and germinal center formation
#MMPMID25916856
Walsh NC
; Waters LR
; Fowler JA
; Lin M
; Cunningham CR
; Brooks DG
; Rehg JE
; Morse HC 3rd
; Teitell MA
EMBO Rep
2015[Jun]; 16
(6
): 753-68
PMID25916856
show ga
T-cell-dependent antigenic stimulation drives the differentiation of B cells into
antibody-secreting plasma cells and memory B cells, but how B cells regulate this
process is unclear. We show that LKB1 expression in B cells maintains B-cell
quiescence and prevents the premature formation of germinal centers (GCs).
Lkb1-deficient B cells (BKO) undergo spontaneous B-cell activation and secretion
of multiple inflammatory cytokines, which leads to splenomegaly caused by an
unexpected expansion of T cells. Within this cytokine response, increased IL-6
production results from heightened activation of NF-?B, which is suppressed by
active LKB1. Secreted IL-6 drives T-cell activation and IL-21 production,
promoting T follicular helper (TFH ) cell differentiation and expansion to
support a ~100-fold increase in steady-state GC B cells. Blockade of IL-6
secretion by BKO B cells inhibits IL-21 expression, a known inducer of TFH -cell
differentiation and expansion. Together, these data reveal cell intrinsic and
surprising cell extrinsic roles for LKB1 in B cells that control TFH -cell
differentiation and GC formation, and place LKB1 as a central regulator of
T-cell-dependent humoral immunity.