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Transgenic Adipose-specific Expression of the Nuclear Receptor RORα Drives a Striking Shift in Fat Distribution and Impairs Glycemic Control.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Tuong, Zewen Kelvin 
Fitzsimmons, Rebecca 
Wang, Shu-Ching Mary 
Oh, Tae Gyu 
Lau, Patrick 

Abstract

RORα is a member of the nuclear receptor (NR) superfamily and analysis of the (global) RORα-deficient mouse model revealed this NR has a role in glycemic control and fat deposition. Therefore, we generated an adipose-specific RORα 'gain of function' mouse model under the control of the fatty acid binding protein 4 (FABP4) promoter to elucidate the function of RORα in adipose tissue. The Tg-FABP4-RORα4 mice demonstrated a shift in fat distribution to non-adipose tissues when challenged with a high fat diet (HFD). Specifically, we observed a subcutaneous lipodystrophy, accompanied by hepatomegaly (fatty liver/mild portal fibrosis) and splenomegaly; in a background of decreased weight gain and total body fat after HFD. Moreover, we observed significantly higher fasting blood glucose and impaired clearance of glucose in Tg-FABP4-RORα4 mice. Genome wide expression and qPCR profiling analysis identified: (i) subcutaneous adipose specific decreases in the expression of genes involved in fatty acid biosynthesis, lipid droplet expansion and glycemic control, and (ii) the fibrosis pathway as the most significant pathway [including dysregulation of the collagen/extracellular matrix (ECM) pathways] in subcutaneous adipose and liver. The pathology presented in the Tg-FABP4-RORα4 mice is reminiscent of human metabolic disease (associated with aberrant ECM expression) highlighting the therapeutic potential of this NR.

Description

Keywords

Collagen, Fibrosis, Hepatomegaly, Obesity, RORα, Subcutaneous adipose, Adipose Tissue, Adiposity, Animals, Biomarkers, Blood Glucose, Cluster Analysis, Extracellular Matrix, Fibrosis, Gene Expression, Gene Expression Profiling, Genotype, Glucose Tolerance Test, Hepatomegaly, Humans, Insulin Resistance, Lipid Metabolism, Lipids, Liver, Mice, Mice, Transgenic, Nuclear Receptor Subfamily 1, Group F, Member 1, Organ Specificity, Phenotype, Splenomegaly, T-Lymphocyte Subsets, Transgenes, Weight Gain

Journal Title

EBioMedicine

Conference Name

Journal ISSN

2352-3964
2352-3964

Volume Title

11

Publisher

Elsevier BV