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2016 ; 8
(9
): 1039-51
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Prolonged contact with dendritic cells turns lymph node-resident NK cells into
anti-tumor effectors
#MMPMID27406819
Mingozzi F
; Spreafico R
; Gorletta T
; Cigni C
; Di Gioia M
; Caccia M
; Sironi L
; Collini M
; Soncini M
; Rusconi M
; von Andrian UH
; Chirico G
; Zanoni I
; Granucci F
EMBO Mol Med
2016[Sep]; 8
(9
): 1039-51
PMID27406819
show ga
Natural killer (NK) cells are critical players against tumors. The outcome of
anti-tumor vaccination protocols depends on the efficiency of NK-cell activation,
and efforts are constantly made to manipulate them for immunotherapeutic
approaches. Thus, a better understanding of NK-cell activation dynamics is
needed. NK-cell interactions with accessory cells and trafficking between
secondary lymphoid organs and tumoral tissues remain poorly characterized. Here,
we show that upon triggering innate immunity with lipopolysaccharide (LPS), NK
cells are transiently activated, leave the lymph node, and infiltrate the tumor,
delaying its growth. Interestingly, NK cells are not actively recruited at the
draining lymph node early after LPS administration, but continue their regular
homeostatic turnover. Therefore, NK cells resident in the lymph node at the time
of LPS administration become activated and exert anti-tumor functions. NK-cell
activation correlates with the establishment of prolonged interactions with
dendritic cells (DCs) in lymph nodes, as observed by two-photon microscopy. Close
DC and NK-cell contacts are essential for the localized delivery of DC-derived
IL-18 to NK cells, a strict requirement in NK-cell activation.