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2018 ; 25
(7
): 1209-1223
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Kynurenic acid, an IDO metabolite, controls TSG-6-mediated immunosuppression of
human mesenchymal stem cells
#MMPMID29238069
Wang G
; Cao K
; Liu K
; Xue Y
; Roberts AI
; Li F
; Han Y
; Rabson AB
; Wang Y
; Shi Y
Cell Death Differ
2018[Jul]; 25
(7
): 1209-1223
PMID29238069
show ga
Mesenchymal stem cells (MSCs) have been demonstrated to be anti-inflammatory
against various immune disorders through several factors, including indoleamine
2,3-dioxygenase (IDO) and TNF-stimulated gene 6 (TSG-6). However, little is known
about the necessity for both of these key immunosuppressive factors. Here we
employed the mouse lipopolysaccharide (LPS)-induced acute lung injury (ALI)
model, and found that IDO is necessary to achieve the effect of human umbilical
cord-derived MSC (hUC-MSC)-based treatment on ALI. Notably, when IDO was deleted
or inhibited, the expression of TSG-6 was decreased. This specific IDO-mediated
regulation of TSG-6 expression was found to be exerted through its metabolite,
kynurenic acid (KYNA), as inhibition of KYNA production led to decreased TSG-6
expression. Importantly, KYNA pretreatment of human MSCs enhanced their
therapeutic effect on ALI. Mechanistically, KYNA activates aryl hydrocarbon
receptor (AhR), which directly binds to the TSG-6 promoter to enhance TSG-6
expression. Therefore, our study has uncovered a novel link between IDO and
TSG-6, and demonstrates that a metabolite of IDO controls the TSG-6-mediated
anti-inflammatory therapeutic effects of human MSCs.