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2017 ; 8
(ä): 1414
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Suppression of Natural Killer Cell Activity by Regulatory NKT10 Cells Aggravates
Alcoholic Hepatosteatosis
#MMPMID29163491
Cui K
; Yan G
; Zheng X
; Bai L
; Wei H
; Sun R
; Tian Z
Front Immunol
2017[]; 8
(ä): 1414
PMID29163491
show ga
We and others have found that the functions of hepatic natural killer (NK) cells
are inhibited but invariant NKT (iNKT) cells become activated after alcohol
drinking, leaving a possibility that there exists interplay between NK cells and
iNKT cells during alcoholic liver disease. Here, in a chronic plus single-binge
ethanol consumption mouse model, we observed that NK cells and interferon-?
(IFN-?) protected against ethanol-induced liver steatosis, as both wild-type (WT)
mice treated with anti-asialo GM1 antibody and IFN-?-deficient GKO mice developed
more severe alcoholic fatty livers. As expected, IFN-? could directly
downregulate lipogenesis in primary hepatocytes in vitro. On the contrary, iNKT
cell-deficient J?18(-/-) or interleukin-10 (IL-10)(-/-) mice showed fewer
alcoholic steatosis, along with the recovered number and IFN-? release of hepatic
NK cells, and exogenous IL-10 injection was sufficient to compensate for iNKT
cell deficiency. Furthermore, NK cell depletion in J?18(-/-) or IL-10(-/-) mice
caused more severe hepatosteatosis, implying NK cells are the direct effector
cells to inhibit liver steatosis. Importantly, adoptive transfer of iNKT cells
purified from normal but not IL-10(-/-) mice resulted in suppression of the
number and functions of NK cells and aggravated alcoholic liver injury in
J?18(-/-) mice, indicating that IL-10-producing iNKT (NKT10) cells are the
regulators on NK cells. Conclusion: Ethanol exposure-triggered NKT10 cells
antagonize the protective roles of NK cells in alcoholic hepatosteatosis.