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2017 ; 8
(ä): 265
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Gastrointestinal Microbiome Dysbiosis in Infant Mice Alters Peripheral CD8(+) T
Cell Receptor Signaling
#MMPMID28337207
Gonzalez-Perez G
; Lamousé-Smith ES
Front Immunol
2017[]; 8
(ä): 265
PMID28337207
show ga
We recently reported that maternal antibiotic treatment (MAT) of mice in the last
days of pregnancy and during lactation dramatically alters the density and
composition of the gastrointestinal microbiota of their infants. MAT infants also
exhibited enhanced susceptibility to a systemic viral infection and altered
adaptive immune cell activation phenotype and function. CD8(+) effector T cells
from MAT infants consistently demonstrate an inability to sustain interferon
gamma (IFN-?) production in vivo following vaccinia virus infection and in vitro
upon T cell receptor (TCR) stimulation. We hypothesize that T cells developing in
infant mice with gastrointestinal microbiota dysbiosis and insufficient toll-like
receptor (TLR) exposure alters immune responsiveness associated with intrinsic T
cell defects in the TCR signaling pathway and compromised T cell effector
function. To evaluate this, splenic T cells from day of life 15 MAT infant mice
were stimulated in vitro with anti-CD3 and anti-CD28 antibodies prior to
examining the expression of ZAP-70, phosphorylated ZAP-70, phospho-Erk-1/2,
c-Rel, total protein tyrosine phosphorylation, and IFN-? production. We determine
that MAT infant CD8(+) T cells fail to sustain total protein tyrosine
phosphorylation and Erk1/2 activation. Lipopolysaccharide treatment in vitro and
in vivo, partially restored IFN-? production in MAT effector CD8(+) T cells and
reduced mortality typically observed in MAT mice following systemic viral
infection. Our results demonstrate a surprising dependence on the
gastrointestinal microbiome and TLR ligand stimulation toward shaping optimal
CD8(+) T cell function during infancy.