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PMID: 19416713 Published · ppublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

Ablation of ARNT/HIF1beta in liver alters gluconeogenesis, lipogenic gene expression, and serum ketones.

Cell metabolism ·Vol. 9 ·No. 5 ·2009-05-00 ·Pages 428-39

Wang XL, Suzuki R, Lee K, Tran T, Gunton JE, Saha AK, Patti ME, Goldfine A, Ruderman NB, Gonzalez FJ, Kahn CR

Abstract

We have previously shown that expression of the transcription factor ARNT/HIF1beta is reduced in islets of humans with type 2 diabetes. We have now found that ARNT is also reduced in livers of diabetics. To study the functional effect of its reduction, we created mice with liver-specific ablation (L-ARNT KO) using ARNT loxP mice and adenoviral-mediated delivery of Cre. L-ARNT KO mice had normal blood glucose but increased fed insulin levels. These mice also exhibited features of type 2 diabetes with increased hepatic gluconeogenesis, increased lipogenic gene expression, and low serum beta-hydroxybutyrate. These effects appear to be secondary to increased expression of CCAAT/enhancer-binding protein alpha (C/EBPalpha), farnesoid X receptor (FXR), and sterol response element-binding protein 1c (SREBP-1c) and a reduction in phosphorylation of AMPK without changes in the expression of enzymes in ketogenesis, fatty acid oxidation, or FGF21. These results demonstrate that a deficiency of ARNT action in the liver, coupled with that in beta cells, could contribute to the metabolic phenotype of human type 2 diabetes.

MeSH Terms
3-Hydroxybutyric Acid/blood AMP-Activated Protein Kinases/metabolism Adult Animals Aryl Hydrocarbon Receptor Nuclear Translocator/deficiency,genetics,metabolism CCAAT-Enhancer-Binding Protein-alpha/metabolism Diabetes Mellitus, Type 2/metabolism Female Gene Expression Gluconeogenesis Humans Insulin/analysis,metabolism Lipogenesis/genetics Liver/enzymology,metabolism Male Mice Mice, Knockout Middle Aged Phosphorylation Receptors, Cytoplasmic and Nuclear/metabolism Sterol Regulatory Element Binding Protein 1/metabolism Tumor Cells, Cultured
Chemicals
ARNT protein, human Arnt protein, mouse CCAAT-Enhancer-Binding Protein-alpha Insulin Receptors, Cytoplasmic and Nuclear Sterol Regulatory Element Binding Protein 1 farnesoid X-activated receptor Aryl Hydrocarbon Receptor Nuclear Translocator AMP-Activated Protein Kinases 3-Hydroxybutyric Acid
Authors & Affiliations
11 authors, click to expand affiliations / ORCID
Wang Xiaohui L
Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA.
Suzuki Ryo
Lee Kevin
Tran Thien
Gunton Jenny E
Saha Asish K
Patti Mary-Elizabeth
Goldfine Allison
Ruderman Neil B
Gonzalez Frank J
Kahn C Ronald
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Article Info
Journal
Cell metabolism
Abbr.
Cell Metab
ISSN
1932-7420
Published
2009-05-00
Pages
428-39
Language
English
Region
United States
NLM ID
101233170
PMCID
PMC2803070
Subset
IM
Grants
NIDDK NIH HHS · R01 DK067509 · United States
NIDDK NIH HHS · R01 DK060837 · United States
NIDDK NIH HHS · DK-067509 · United States
NIDDK NIH HHS · DK-060837 · United States
NHLBI NIH HHS · P01 HL068758 · United States
Intramural NIH HHS · Z01 BC005708-17 · United States
NHLBI NIH HHS · P01HL68758 · United States
Databases
GEO
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