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2016 ; 7
(48
): 78372-78386
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Ischemic preconditioning attenuates ischemia/reperfusion injury in rat steatotic
liver: role of heme oxygenase-1-mediated autophagy
#MMPMID27852058
Liu A
; Guo E
; Yang J
; Li R
; Yang Y
; Liu S
; Hu J
; Jiang X
; Dirsch O
; Dahmen U
; Sun J
; Ouyang M
Oncotarget
2016[Nov]; 7
(48
): 78372-78386
PMID27852058
show ga
Steatotic livers are more susceptible to ischemia/reperfusion (I/R) injury, which
is ameliorated by ischemic preconditioning (IPC). Autophagy possesses protective
action on liver I/R injury and declines in steatotic livers. The aim of this
study was to test the hypothesis that the increased susceptibility of steatotic
livers to I/R injury was associated with defective hepatic autophagy, which could
be restored by IPC via heme oxygenase-1 (HO-1) signaling. Obesity and hepatic
steatosis was induced using a high fat diet. Obesity impaired hepatic autophagy
activity and decreased hepatic HO-1 expression. Induction of HO-1 restored
autophagy activity and inhibited calpain 2 activity. Additionally, suppression of
calpain 2 activity also restored autophagy activity. Mitochondrial dysfunction
and hepatocellular injury were significantly increased in steatotic livers
compared to lean livers in response to I/R injury. This increase in sensitivity
to I/R injury was associated with defective hepatic autophagy activity in
steatotic livers. IPC increased autophagy and reduced mitochondrial dysfunction
and hepatocellular damage in steatotic livers following I/R injury. Furthermore,
IPC increased HO-1 expression. Inhibition of HO-1 decreased the IPC-induced
autophagy, increased calpain 2 activity and diminished the protective effect of
IPC against I/R injury. Inhibition of calpain 2 restored autophagic defect and
attenuated mitochondrial dysfunction in steatotic livers after I/R. Collectively,
IPC might ameliorate steatotic liver damage and restore mitochondrial function
via HO-1-mediated autophagy.
|*Autophagy
[MESH]
|Animals
[MESH]
|Autophagy-Related Protein 7/genetics/metabolism
[MESH]