Multi-technique comparison of atherogenic and MCD NASH models highlights changes in sphingolipid metabolism.
Sci Rep
; 9(1): 16810, 2019 11 14.
Article
in En
| MEDLINE
| ID: mdl-31728041
ABSTRACT
Lipotoxicity is a key player in the pathogenesis of nonalcoholic steatohepatitis (NASH), a progressive subtype of nonalcoholic fatty liver disease (NAFLD). In the present study, we combine histological, transcriptional and lipidomic approaches to dissociate common and specific alterations induced by two classical dietary NASH models (atherogenic (ATH) and methionine/choline deficient (MCD) diet) in C57BL/6J male mice. Despite a similar degree of steatosis, MCD-fed mice showed more pronounced liver damage and a worsened pro-inflammatory and pro-fibrogenic environment than ATH-fed mice. Regarding lipid metabolism, the ATH diet triggered hepatic counter regulatory mechanisms, while the MCD diet worsened liver lipid accumulation by a concomitant increase in lipid import and reduction in lipid export. Liver lipidomics revealed sphingolipid enrichment in both NASH models that was accompanied by an upregulation of the ceramide biosynthesis pathway and a significant rise in dihydroceramide levels. In contrast, the phospholipid composition was not substantially altered by the ATH diet, whereas the livers of MCD-fed mice presented a reduced phosphatidylcholine to phosphatidylethanolamine (PC/PE) ratio and a strong depletion in phospholipids containing the sum of 34-36 carbons in their fatty acid chains. Therefore, the assessment of liver damage at the histological and transcriptional level combined with a lipidomic analysis reveals sphingolipids as shared mediators in liver lipotoxicity and pathogenesis of NASH.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sphingolipids
/
Diet
/
Atherosclerosis
/
Gene Regulatory Networks
/
Non-alcoholic Fatty Liver Disease
Limits:
Animals
Language:
En
Journal:
Sci Rep
Year:
2019
Document type:
Article
Affiliation country:
Switzerland