Article ; Online: Hepatic deletion of Mboat7 (LPIAT1) causes activation of SREBP-1c and fatty liver.
2021 Volume 62, Page(s) 100031
Abstract: Genetic variants that increase the risk of fatty liver disease and cirrhosis have recently been identified in the proximity of membrane-bound O-acyltransferase domain-containing 7 (MBOAT7). To elucidate the link between these variants and fatty liver ... ...
Abstract | Genetic variants that increase the risk of fatty liver disease and cirrhosis have recently been identified in the proximity of membrane-bound O-acyltransferase domain-containing 7 (MBOAT7). To elucidate the link between these variants and fatty liver disease, we characterized Mboat7 liver-specific KO mice (Mboat7 LSKO). Chow-fed Mboat7 LSKO mice developed fatty livers and associated liver injury. Lipidomic analysis of liver using MS revealed a pronounced reduction in 20-carbon PUFA content in phosphatidylinositols (PIs) but not in other phospholipids. The change in fatty acid composition of PIs in these mice was associated with a marked increase in de novo lipogenesis because of activation of SREBP-1c, a transcription factor that coordinates the activation of genes encoding enzymes in the fatty acid biosynthesis pathway. Hepatic removal of both SREBP cleavage-activating protein (Scap) and Mboat7 normalized hepatic triglycerides relative to Scap-only hepatic KO, showing that increased SREBP-1c processing is required for Mboat7-induced steatosis. This study reveals a clear relationship between PI fatty acid composition and regulation of hepatic fat synthesis and delineates the mechanism by which mutations in MBOAT7 cause hepatic steatosis. |
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MeSH term(s) | Sterol Regulatory Element Binding Protein 1 |
Chemical Substances | Sterol Regulatory Element Binding Protein 1 |
Language | English |
Publishing date | 2021-02-06 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural |
ZDB-ID | 80154-9 |
ISSN | 1539-7262 ; 0022-2275 |
ISSN (online) | 1539-7262 |
ISSN | 0022-2275 |
DOI | 10.1194/jlr.RA120000856 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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