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2015 ; 16
(9
): 980-90
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gab.com Text
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LEF-1 and TCF-1 orchestrate T(FH) differentiation by regulating differentiation
circuits upstream of the transcriptional repressor Bcl6
#MMPMID26214741
Choi YS
; Gullicksrud JA
; Xing S
; Zeng Z
; Shan Q
; Li F
; Love PE
; Peng W
; Xue HH
; Crotty S
Nat Immunol
2015[Sep]; 16
(9
): 980-90
PMID26214741
show ga
Follicular helper T cells (T(FH) cells) are specialized effector CD4(+) T cells
that help B cells develop germinal centers (GCs) and memory. However, the
transcription factors that regulate the differentiation of T(FH) cells remain
incompletely understood. Here we report that selective loss of Lef1 or Tcf7
(which encode the transcription factor LEF-1 or TCF-1, respectively) resulted in
T(FH) cell defects, while deletion of both Lef1 and Tcf7 severely impaired the
differentiation of T(FH) cells and the formation of GCs. Forced expression of
LEF-1 enhanced T(FH) differentiation. LEF-1 and TCF-1 coordinated such
differentiation by two general mechanisms. First, they established the
responsiveness of naive CD4(+) T cells to T(FH) cell signals. Second, they
promoted early T(FH) differentiation via the multipronged approach of sustaining
expression of the cytokine receptors IL-6R? and gp130, enhancing expression of
the costimulatory receptor ICOS and promoting expression of the transcriptional
repressor Bcl6.