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2016 ; 6
(ä): 28806
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The Cannabinoid Receptor 2 Protects Against Alcoholic Liver Disease Via a
Macrophage Autophagy-Dependent Pathway
#MMPMID27346657
Denaës T
; Lodder J
; Chobert MN
; Ruiz I
; Pawlotsky JM
; Lotersztajn S
; Teixeira-Clerc F
Sci Rep
2016[Jun]; 6
(ä): 28806
PMID27346657
show ga
Kupffer cells, the resident macrophages of the liver, play a major role in the
pathogenesis of alcoholic liver disease. We have previously demonstrated that CB2
receptor protects against alcoholic liver disease by inhibiting alcohol-induced
inflammation and steatosis via the regulation of Kupffer cell activation. Here,
we explored the mechanism underlying these effects and hypothesized that the
anti-inflammatory properties of CB2 receptor in Kupffer cells rely on activation
of autophagy. For this purpose, mice invalidated for CB2 receptor (CB2(Mye-/-)
mice) or for the autophagy gene ATG5 (ATG5(Mye-/-) mice) in the myeloid lineage,
and their littermate wild-type mice were subjected to chronic-plus-binge ethanol
feeding. CB2(Mye-/-) mice showed exacerbated alcohol-induced pro-inflammatory
gene expression and steatosis. Studies in cultured macrophages demonstrated that
CB2 receptor activation by JWH-133 stimulated autophagy via a heme oxygenase-1
dependent pathway. Moreover, JWH-133 reduced the induction of inflammatory genes
by lipopolysaccharide in wild-type macrophages, but not in ATG5-deficient cells.
The CB2 agonist also protected from alcohol-induced liver inflammation and
steatosis in wild-type mice, but not in ATG5(Mye-/-) mice demonstrating that
macrophage autophagy mediates the anti-inflammatory and anti-steatogenic effects
of CB2 receptor. Altogether these results demonstrate that CB2 receptor
activation in macrophages protects from alcohol-induced steatosis by inhibiting
hepatic inflammation through an autophagy-dependent pathway.
|*Autophagy
[MESH]
|Alleles
[MESH]
|Animals
[MESH]
|Anti-Inflammatory Agents/chemistry
[MESH]
|Autophagy-Related Protein 5/genetics
[MESH]
|Cell Lineage
[MESH]
|Ethanol/chemistry
[MESH]
|Fatty Liver/metabolism
[MESH]
|Heme Oxygenase-1/metabolism
[MESH]
|Hepatitis, Alcoholic/metabolism
[MESH]
|Inflammation
[MESH]
|Lipopolysaccharides/chemistry
[MESH]
|Liver Diseases, Alcoholic/*metabolism/pathology/prevention & control
[MESH]