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2017 ; 47
(7
): 1136-1141
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Bcl6 promotes follicular helper T-cell differentiation and PD-1 expression in a
Blimp1-independent manner in mice
#MMPMID28586108
Xie MM
; Koh BH
; Hollister K
; Wu H
; Sun J
; Kaplan MH
; Dent AL
Eur J Immunol
2017[Jul]; 47
(7
): 1136-1141
PMID28586108
show ga
The transcription factors Bcl6 and Blimp1 have opposing roles in the development
of the follicular helper T (T(FH) ) cells: Bcl6 promotes and Blimp1 inhibits
T(FH) -cell differentiation. Similarly, Bcl6 activates, while Blimp1 represses,
expression of the T(FH) -cell marker PD-1. However, Bcl6 and Blimp1 repress each
other's expression, complicating the interpretation of the regulatory network.
Here we sought to clarify the extent to which Bcl6 and Blimp1 independently
control T(FH) -cell differentiation by generating mice with T-cell specific
deletion of both Bcl6 and Blimp1 (double conditional KO [dcKO] mice). Our data
indicate that Blimp1 does not control T(FH) -cell differentiation independently
of Bcl6. However, a population of T follicular regulatory (T(FR) ) cells
developed independently of Bcl6 in dcKO mice. We have also analyzed regulation of
IL-10 and PD-1, two genes controlled by both Bcl6 and Blimp1, and observed that
Bcl6 regulates both genes independently of Blimp1. We found that Bcl6 positively
regulates PD-1 expression by inhibiting the ability of T-bet/Tbx21 to repress
Pdcd1 transcription. Our data provide a novel mechanism for positive control of
gene expression by Bcl6, and illuminate how Bcl6 and Blimp1 control T(FH) -cell
differentiation.