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2014 ; 41
(6
): 1026-39
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English Wikipedia
The coinhibitory receptor CTLA-4 controls B cell responses by modulating T
follicular helper, T follicular regulatory, and T regulatory cells
#MMPMID25526313
Sage PT
; Paterson AM
; Lovitch SB
; Sharpe AH
Immunity
2014[Dec]; 41
(6
): 1026-39
PMID25526313
show ga
The receptor CTLA-4 has been implicated in controlling B cell responses, but the
mechanisms by which CTLA-4 regulates antibody production are not known. Here we
showed deletion of CTLA-4 in adult mice increased Tfh and Tfr cell numbers and
augmented B cell responses. In the effector phase, loss of CTLA-4 on Tfh cells
resulted in heightened B cell responses, whereas loss of CTLA-4 on Tfr cells
resulted in defective suppression of antigen-specific antibody responses. We also
found that non-Tfr Treg cells could suppress B cell responses through CTLA-4 and
that Treg and/or Tfr cells might downregulate B7-2 on B cells outside germinal
centers as a means of suppression. Within the germinal center, however, Tfr cells
potently suppress B cells through CTLA-4, but with a mechanism independent of
altering B7-1 or B7-2. Thus, we identify multifaceted regulatory roles for CTLA-4
in Tfh, Tfr, and Treg cells, which together control humoral immunity.