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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Med
2018 ; 24
(2
): 224-231
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Transitory presence of myeloid-derived suppressor cells in neonates is critical
for control of inflammation
#MMPMID29334374
He YM
; Li X
; Perego M
; Nefedova Y
; Kossenkov AV
; Jensen EA
; Kagan V
; Liu YF
; Fu SY
; Ye QJ
; Zhou YH
; Wei L
; Gabrilovich DI
; Zhou J
Nat Med
2018[Feb]; 24
(2
): 224-231
PMID29334374
show ga
Myeloid-derived suppressor cells (MDSCs) are pathologically activated and
relatively immature myeloid cells that have been implicated in the immunological
regulation of many pathologic conditions. Phenotypically and morphologically,
MDSCs are similar to neutrophils (PMN-MDSCs) and monocytes (M-MDSCs). However,
they have potent suppressive activity and distinct gene expression profiles and
biochemical characteristics. No or very few MDSCs are observed in steady-state
physiological conditions. Therefore, until recently, accumulation of MDSCs was
considered a consequence of pathological processes or pregnancy. Here, we report
that MDSCs with a potent ability to suppress T cells are present during the first
weeks of life in mice and humans. MDSC suppressive activity was triggered by
lactoferrin and mediated by nitric oxide, PGE2, and S100A9 and S100A8 proteins.
MDSCs from newborns had a transcriptome similar to that of tumor MDSCs, but with
strong upregulation of an antimicrobial gene network, and had potent
antibacterial activity. MDSCs played a critical role in control of experimental
necrotizing enterocolitis (NEC) in newborn mice. MDSCs in infants with very low
weight, who are prone to NEC, had lower MDSC levels and suppressive activity than
did infants with normal weight. Thus, the transitory presence of MDSCs may be
critical for regulation of inflammation in newborns.