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Cell Mol Gastroenterol Hepatol. 2017 Jul 06;4(3):365-383. doi: 10.1016/j.jcmgh.2017.06.005. eCollection 2017 Nov.

Hepatocyte-Specific Deletion of Mouse Lamin A/C Leads to Male-Selective Steatohepatitis.

Cellular and molecular gastroenterology and hepatology

Raymond Kwan, Graham F Brady, Maria Brzozowski, Sujith V Weerasinghe, Hope Martin, Min-Jung Park, Makayla J Brunt, Ram K Menon, Xin Tong, Lei Yin, Colin L Stewart, M Bishr Omary

Affiliations

  1. Department of Molecular and Integrative Physiology.
  2. Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.
  3. Development and Regenerative Biology Group, Institute of Medical Biology, Immunos, Singapore.

PMID: 28913408 PMCID: PMC5582719 DOI: 10.1016/j.jcmgh.2017.06.005

Abstract

BACKGROUND & AIMS: Lamins are nuclear intermediate filament proteins that comprise the major components of the nuclear lamina. Mutations in

METHODS: To address these questions, we generated mice carrying a hepatocyte-specific deletion of

RESULTS: KO hepatocytes manifested abnormal nuclear morphology, and KO mice showed reduced body mass. KO mice developed spontaneous male-selective hepatosteatosis with increased susceptibility to high-fat diet-induced steatohepatitis and fibrosis. The hepatosteatosis was associated with up-regulated transcription of genes encoding lipid transporters, lipid biosynthetic enzymes, lipid droplet-associated proteins, and interferon-regulated genes. Hepatic

CONCLUSIONS: Lamin A/C acts cell-autonomously to maintain hepatocyte homeostasis and nuclear shape and buffers against male-selective steatohepatitis by positively regulating growth hormone signaling and negatively regulating Stat1 expression. Lamins are potential genetic modifiers for predisposition to steatohepatitis and liver fibrosis. The microarray data can be found in the Gene Expression Omnibus repository (accession number: GSE93643).

Keywords: % liver weight, liver percentage of body mass; Erk, extracellular signal–regulated kinase; FPLD2, Dunnigan familial partial lipodystrophy; Fibrosis; GH, growth hormone; Growth Hormone Signaling; HFD, high-fat diet; Het, heterozygous; Igf1, insulin-like growth factor 1; Jak2, Janus kinase 2; KO, knockout; Laminopathy; Lipodystrophy; NAFLD, nonalcoholic fatty liver disease; ND, normal diet; Nonalcoholic Fatty Liver Disease; PBS, phosphate-buffered saline; Stat, signal transducer and activator of transcription; WT, wild type; qPCR, quantitative polymerase chain reaction

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