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Blockade of AT1 Receptor Improves Adipocyte Differentiation in Atherosclerotic and Diabetic Models.
- Source :
- American Journal of Hypertension; Feb2008, Vol. 21 Issue 2, p206-212, 7p, 2 Charts, 5 Graphs
- Publication Year :
- 2008
-
Abstract
- BACKGROUND The roles of the angiotensin (Ang) II type 1 (AT<subscript>1</subscript>) receptor in the changes in white adipose tissue were explored in an animal model of atherosclerosis using apolipoprotein E-deficient (ApoEKO) mice. METHODS Apolipoprotein E-deficient (ApoEKO) mice and KK-A<superscript>y</superscript> mice were used. Expression of markers for adipocyte differentiation and inflammation was determined by real-time reverse-transcription polymerase chain reaction. RESULTS Adipose tissue weight and adipocyte size in epididymal white adipose tissue were increased in ApoEKO mice and KK-A<superscript>y</superscript> mice. In the adipose tissue of these models, expression of adiponectin and peroxisome proliferator-activated receptor-γ (PPARγ), which induce adipocyte differentiation, and expression of transcription factors of adipocyte differentiation, such as CCAAT-enhancer-binding protein-α (C/EBPα) and aP2, were decreased. Expression of inflammatory markers and nicotinamide adenine dinucleotide phosphate oxidase subunits was also increased. Deletion of AT<subscript>1</subscript>a receptor in ApoEKO mice and administration of an AT<subscript>1</subscript> receptor blocker, valsartan, to KK-A<superscript>y</superscript> mice reduced epididymal adipose tissue weight and adipocyte size significantly. Blockade of the AT<subscript>1</subscript> receptor also reduced the expression of inflammatory chemokines and oxidative stress markers. Moreover, AT<subscript>1</subscript>a receptor deletion in ApoEKO mice and AT<subscript>1</subscript> receptor blockade in KK-A<superscript>y</superscript> mice prevented the decrease in expression of adiponectin, PPARγ, C/EBPα, and aP2. Valsartan also increased glucose uptake induced by insulin in adipose tissue of KK-A<superscript>y</superscript> mice. CONCLUSIONS These results suggest that enlargement and weakened differentiation of adipocytes are observed in atherosclerosis and diabetes, and that AT<subscript>1</subscript> receptor blockade prevented adipocyte enlargement and promoted adipocyte differentiation in these models. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08957061
- Volume :
- 21
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- American Journal of Hypertension
- Publication Type :
- Academic Journal
- Accession number :
- 36912604
- Full Text :
- https://doi.org/10.1038/ajh.2007.50