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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2016 ; 197
(2
): 458-69
Nephropedia Template TP
gab.com Text
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English Wikipedia
The Lupus Susceptibility Gene Pbx1 Regulates the Balance between Follicular
Helper T Cell and Regulatory T Cell Differentiation
#MMPMID27296664
Choi SC
; Hutchinson TE
; Titov AA
; Seay HR
; Li S
; Brusko TM
; Croker BP
; Salek-Ardakani S
; Morel L
J Immunol
2016[Jul]; 197
(2
): 458-69
PMID27296664
show ga
Pbx1 controls chromatin accessibility to a large number of genes and is entirely
conserved between mice and humans. The Pbx1-d dominant-negative isoform is more
frequent in CD4(+) T cells from lupus patients than from healthy controls. Pbx1-d
is associated with the production of autoreactive T cells in mice carrying the
Sle1a1 lupus-susceptibility locus. Transgenic (Tg) expression of Pbx1-d in CD4(+)
T cells reproduced the phenotypes of Sle1a1 mice, with increased inflammatory
functions of CD4(+) T cells and impaired Foxp3(+) regulatory T cell (Treg)
homeostasis. Pbx1-d-Tg expression also expanded the number of follicular helper T
cells (TFHs) in a cell-intrinsic and Ag-specific manner, which was enhanced in
recall responses and resulted in Th1-biased Abs. Moreover, Pbx1-d-Tg CD4(+) T
cells upregulated the expression of miR-10a, miR-21, and miR-155, which were
implicated in Treg and follicular helper T cell homeostasis. Our results suggest
that Pbx1-d impacts lupus development by regulating effector T cell
differentiation and promoting TFHs at the expense of Tregs. In addition, our
results identify Pbx1 as a novel regulator of CD4(+) T cell effector function.