Abstract

The current epidemic of obesity and the metabolic syndrome has dramatically increased the frequency of fatty liver, which can cause fibrosis, cirrhosis, end-stage liver disease and hepatoma. Fatty liver (steatosis) affects approximately 30 percent of the people in the USA. SHP (small heterodimer partner) is a nuclear receptor that regulates several major aspects of the metabolic syndrome, including obesity, dyslipidemia and insulin sensitivity. The major objective of this study is to determine how SHP-deficiency prevents fatty liver in mice. The central hypothesis is that SHP regulates hepatic fatty acid uptake and oxidation (Aim #1) and hepatic lipoprotein catabolism (Aim #2) in a way that has a major influence on the development of fatty liver. The loss of SHP regulation is predicted to increase lipid oxidation, and decrease lipid uptake, which coordinately decreases fat accumulation in the liver. This hypothesis is based on the Preliminary Results, demonstrating that: a) SHP deficiency in SHP-/- mice decreases hepatic lipid accumulation and protects against high-cholesterol or high-fat diet induced steatosis;b) fatty liver in obese diabetic mice (OB/OB) is prevented by the absence of SHP (OB/SHP-/- mice);c) the PPAR? pathway is down-regulated, whereas the PPARa pathway is upregulated in SHP-null mice;and d) lipoprotein clearance and HDL cholesterol uptake is decreased by SHP-deficiency. Once the mechanisms of SHP regulated transcription of critical genes in these pathways are defined, it should be possible to target these processes with small molecules to improve or prevent fatty liver disease (long-term goal).
The Specific Aims are to define: (1) mechanisms for SHP regulation of hepatic fatty acid uptake and oxidation;and, (2) mechanism for SHP regulation of lipoprotein catabolism. Identifying specific functions of SHP and the mechanisms preventing fatty liver in SHP deficient mice should provide mechanistic insight and novel approaches to treating or preventing fatty liver in patients.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK080440-04
Application #
8136529
Study Section
Integrative Nutrition and Metabolic Processes Study Section (INMP)
Program Officer
Maruvada, Padma
Project Start
2008-09-01
Project End
2013-08-31
Budget Start
2011-09-01
Budget End
2012-08-31
Support Year
4
Fiscal Year
2011
Total Cost
$258,133
Indirect Cost

  Institution

Name
University of Utah
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
009095365
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112

  Publications

Liu, Chune; Yang, Zhihong; Wu, Jianguo et al. (2018) Long noncoding RNA H19 interacts with polypyrimidine tract-binding protein 1 to reprogram hepatic lipid homeostasis. Hepatology 67:1768-1783
Hollister, Kristin; Kusumanchi, Praveen; Ross, Ruth Ann et al. (2018) Levels of circulating follicular helper T cells, T helper 1 cells, and the prognostic significance of soluble form of CD40 ligand on survival in patients with alcoholic cirrhosis. Liver Res 2:52-59
Chang, Binxia; Hao, Shuli; Zhang, Longyu et al. (2018) Association Between Aldehyde Dehydrogenase 2 Glu504Lys Polymorphism and Alcoholic Liver Disease. Am J Med Sci 356:10-14
Zhao, Yulan; Yang, Zhihong; Wu, Jianguo et al. (2017) High-mobility-group protein 2 regulated by microRNA-127 and small heterodimer partner modulates pluripotency of mouse embryonic stem cells and liver tumor initiating cells. Hepatol Commun 1:816-830
Yang, Zhihong; Ross, Ruth A; Zhao, Shi et al. (2017) LncRNA AK054921 and AK128652 are potential serum biomarkers and predictors of patient survival with alcoholic cirrhosis. Hepatol Commun 1:513-523
Yu, Ai-Ming; Ingelman-Sundberg, Magnus; Cherrington, Nathan J et al. (2017) Regulation of drug metabolism and toxicity by multiple factors of genetics, epigenetics, lncRNAs, gut microbiota, and diseases: a meeting report of the 21st International Symposium on Microsomes and Drug Oxidations (MDO). Acta Pharm Sin B 7:241-248
Zhang, Li; Yang, Zhihong; Trottier, Jocelyn et al. (2017) Long noncoding RNA MEG3 induces cholestatic liver injury by interaction with PTBP1 to facilitate shp mRNA decay. Hepatology 65:604-615
Song, Yongfeng; Liu, Chune; Liu, Xia et al. (2017) H19 promotes cholestatic liver fibrosis by preventing ZEB1-mediated inhibition of epithelial cell adhesion molecule. Hepatology 66:1183-1196
Choiniere, Jonathan; Wu, Jianguo; Wang, Li (2017) Pyruvate Dehydrogenase Kinase 4 Deficiency Results in Expedited Cellular Proliferation through E2F1-Mediated Increase of Cyclins. Mol Pharmacol 91:189-196
Tran, Melanie; Lee, Sang-Min; Shin, Dong-Ju et al. (2017) Loss of miR-141/200c ameliorates hepatic steatosis and inflammation by reprogramming multiple signaling pathways in NASH. JCI Insight 2:

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