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2014 ; 40
(6
): 974-88
Nephropedia Template TP
Soudja SM
; Chandrabos C
; Yakob E
; Veenstra M
; Palliser D
; Lauvau G
Immunity
2014[Jun]; 40
(6
): 974-88
PMID24931122
show ga
Cells of the innate immune system are essential for host defenses against primary
microbial pathogen infections, yet their involvement in effective memory
responses of vaccinated individuals has been poorly investigated. Here we show
that memory T cells instruct innate cells to become potent effector cells in a
systemic and a mucosal model of infection. Memory T cells controlled phagocyte,
dendritic cell, and NK or NK T cell mobilization and induction of a strong
program of differentiation, which included their expression of effector cytokines
and microbicidal pathways, all of which were delayed in nonvaccinated hosts.
Disruption of IFN-? signaling in Ly6C+ monocytes, dendritic cells, and
macrophages impaired these processes and the control of pathogen growth. These
results reveal how memory T cells, through rapid secretion of IFN-?, orchestrate
extensive modifications of host innate immune responses that are essential for
effective protection of vaccinated hosts.