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2018 ; 9
(ä): 1464
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Lipopolysaccharide-Induced Dephosphorylation of AMPK-Activated Protein Kinase
Potentiates Inflammatory Injury via Repression of ULK1-Dependent Autophagy
#MMPMID29988556
Fan K
; Lin L
; Ai Q
; Wan J
; Dai J
; Liu G
; Tang L
; Yang Y
; Ge P
; Jiang R
; Zhang L
Front Immunol
2018[]; 9
(ä): 1464
PMID29988556
show ga
AMP-activated protein kinase (AMPK) is a crucial metabolic regulator with
profound modulatory activities on inflammation. Although the anti-inflammatory
benefits of AMPK activators were well documented in experimental studies, the
pathological significance of endogenous AMPK in inflammatory disorders largely
remains unknown. This study investigated the phosphorylation status of endogenous
AMPK and the potential roles of AMPK in mice with lipopolysaccharide
(LPS)-induced lethal inflammation. The results indicated that LPS
dose-dependently decreased the phosphorylation level of AMPK and its target
protein acetyl-CoA carboxylase (ACC). Reactivation of AMPK with the AMPK
activator A-769662 suppressed LPS-induced elevation of interleukin 6, alleviated
histological abnormalities in lung and improved the survival of LPS-challenged
mice. Treatment with A-769662 restored LPS-induced suppression of autophagy,
inhibition of autophagy by 3-MA reversed the beneficial effects of A-769662.
Treatment with A-769662 suppressed LPS-induced activation of mammalian target of
rapamycin (mTOR), co-administration of mTOR activator abolished the beneficial
effects of A-769662, and the suppressive effects of A-769662 on
uncoordinated-51-like kinase 1 (ULK1) phosphorylation. Inhibition of ULK1 removed
the beneficial effects of A-769662. These data indicated that LPS-induced
dephosphorylation of AMPK could result in weakened inhibition of mTOR and
repression of ULK1-dependent autophagy, which might potentiate the development of
LPS-induced inflammatory injury. These data suggest that pharmacological
restoration of AMPK activation might be a beneficial approach for the
intervention of inflammatory disorders.