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2013 ; 190
(12
): 6115-25
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Viral antigen induces differentiation of Foxp3+ natural regulatory T cells in
influenza virus-infected mice
#MMPMID23667113
Bedoya F
; Cheng GS
; Leibow A
; Zakhary N
; Weissler K
; Garcia V
; Aitken M
; Kropf E
; Garlick DS
; Wherry EJ
; Erikson J
; Caton AJ
J Immunol
2013[Jun]; 190
(12
): 6115-25
PMID23667113
show ga
We examined the formation, participation, and functional specialization of
virus-reactive Foxp3(+) regulatory T cells (Tregs) in a mouse model of influenza
virus infection. "Natural" Tregs generated intrathymically, based on interactions
with a self-peptide, proliferated in response to a homologous viral Ag in the
lungs and, to a lesser extent, in the lung-draining mediastinal lymph nodes
(medLNs) of virus-infected mice. In contrast, conventional CD4(+) T cells with
identical TCR specificity underwent little or no conversion to become "adaptive"
Tregs. The virus-reactive Tregs in the medLNs and the lungs of infected mice
upregulated a variety of molecules associated with Treg activation, as well as
acquired expression of molecules (T-bet, Blimp-1, and IL-10) that confer
functional specialization to Tregs. Notably, however, the phenotypes of the
T-bet(+) Tregs obtained from these sites were distinct, because Tregs isolated
from the lungs expressed significantly higher levels of T-bet, Blimp-1, and IL-10
than did Tregs from the medLNs. Adoptive transfer of Ag-reactive Tregs led to
decreased proliferation of antiviral CD4(+) and CD8(+) effector T cells in the
lungs of infected hosts, whereas depletion of Tregs had a reciprocal effect.
These studies demonstrate that thymically generated Tregs can become activated by
a pathogen-derived peptide and acquire discrete T-bet(+) Treg phenotypes while
participating in and modulating an antiviral immune response.