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Reduction in ABCG1 in Type 2 diabetic mice increases macrophage foam cell formation. | LitMetric

Reduction in ABCG1 in Type 2 diabetic mice increases macrophage foam cell formation.

J Biol Chem

Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908; Division of Endocrinology & Metabolism, University of Virginia, Charlottesville, Virginia 22908; Cardiovascular Research Center, University of Virginia, Charlottesville, Virginia 22908. Electronic address:

Published: July 2006

AI Article Synopsis

Article Abstract

Atherosclerosis development is accelerated severalfold in patients with Type 2 diabetes. In the initial stages of disease, monocytes transmigrate into the subendothelial space and differentiate into foam cells. Scavenger receptors and ATP binding cassette (ABC) Transporters play an important role in foam cell formation as they regulate the influx and efflux of oxidized lipids. Here, we show that peritoneal macrophages isolated from Type 2 diabetic db/db mice have decreased expression of the ABC transporter ABCG1 and increased expression of the scavenger receptor CD36. We found a 2-fold increase in accumulation of esterified cholesterol in diabetic db/db macrophages compared with wild-type control macrophages. Diabetic db/db macrophages also had impaired cholesterol efflux to high density lipoprotein but not to lipid-free apo A-I, suggesting that the increased esterified cholesterol in diabetic db/db macrophages was due to a selective loss of ABCG1-mediated efflux to high density lipoprotein. Additionally, we were able to confirm down-regulation of ABCG1 using C57BL/6J peritoneal macrophages cultured in elevated glucose in vitro (25 mM glucose for 7 days), suggesting that ABCG1 expression in diabetic macrophages is regulated by chronic exposure to elevated glucose. Diabetic KK(ay) mice were also studied and were found to have decreased ABCG1 expression without an increase in CD36. These observations demonstrate that ABCG1 plays a major role in macrophage cholesterol efflux and that decreased ABCG1 function can facilitate foam cell formation in Type 2 diabetic mice.

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Source
http://dx.doi.org/10.1074/jbc.M510952200DOI Listing

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