Cited by 60Lipid metabolism and biosynthesisLiver Disease Diagnosis and TreatmentLipid metabolism and disorders

Hepatic deletion of Mboat7 (LPIAT1) causes activation of SREBP-1c and fatty liver

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Xia, Mingfeng, Chandrasekaran, Preethi, Rong, Shunxing, Fu, Xiaorong, Mitsche, Matthew A.·2021·Journal of Lipid Research

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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Authors
Xia, M., Chandrasekaran, P., Rong, S., Fu, X., & Mitsche, M. A.
Affiliations
  • Fudan University (CN)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
Mitsche, Matthew A.
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2021
Volume
62
Pages
100031
ISSN
0022-2275 (ISSN-L)
OpenAlex
W3082989514
Cited by
60
References
47
Citations by year
2026: 4 · 2025: 7 · 2024: 10 · 2023: 19 · 2022: 9 · 2021: 9 · 2020: 2
FWCI
4.18
Type
journal article
Language
en
Open access
Locations
  • Journal of Lipid Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
Keywords
MBOAT7, SREBP-1c, hepatic steatosis, de novo lipogenesis, phosphatidylinositol, polyunsaturated fatty acids, SCAP, hepatic triglycerides, liver injury, genetic variants, lipidomics
MeSH terms
Sterol Regulatory Element Binding Protein 1

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