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Role of HDL, ABCA1, and ABCG1 Transporters in Cholesterol Efflux and Immune Responses

Role of HDL, ABCA1, and ABCG1 Transporters in Cholesterol Efflux and Immune Responses ATVB In Focus HDL Structure, Function, Therapeutics and Imaging Series Editor: Stanley Hazen Role of HDL, ABCA1, and ABCG1 Transporters in Cholesterol Efflux and Immune Responses Laurent Yvan-Charvet, Nan Wang, Alan R. Tall Abstract—Atherosclerosis has been characterized as a chronic inflammatory response to cholesterol deposition in arteries, but the mechanisms linking cholesterol accumulation in macrophage foam cells to inflammation are poorly understood. Macrophage cholesterol efflux occurs at all stages of atherosclerosis and protects cells from free cholesterol and oxysterol-induced toxicity. The ATP-binding cassette transporters ABCA1 and ABCG1 are responsible for the major part of macrophage cholesterol efflux to serum or HDL in macrophage foam cells, but other less efficient pathways such as passive efflux are also involved. Recent studies have shown that the sterol efflux activities of ABCA1 and ABCG1 modulate macrophage expression of inflammatory cytokines and chemokines as well as lymphocyte proliferative responses. In macrophages, transporter deficiency causes increased signaling via various Toll-like receptors including TLR4. These studies have shown that the traditional roles of HDL and ABC transporters in cholesterol efflux and reverse cholesterol transport are mechanistically linked to antiinflammatory and immunosuppressive functions of HDL. The underlying mechanisms may involve modulation of sterol levels and lipid organization http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arteriosclerosis, Thrombosis, and Vascular Biology Wolters Kluwer Health

Role of HDL, ABCA1, and ABCG1 Transporters in Cholesterol Efflux and Immune Responses

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References (64)

ISSN
1079-5642
eISSN
1524-4636
DOI
10.1161/ATVBAHA.108.179283
pmid
19797709
Publisher site
See Article on Publisher Site

Abstract

ATVB In Focus HDL Structure, Function, Therapeutics and Imaging Series Editor: Stanley Hazen Role of HDL, ABCA1, and ABCG1 Transporters in Cholesterol Efflux and Immune Responses Laurent Yvan-Charvet, Nan Wang, Alan R. Tall Abstract—Atherosclerosis has been characterized as a chronic inflammatory response to cholesterol deposition in arteries, but the mechanisms linking cholesterol accumulation in macrophage foam cells to inflammation are poorly understood. Macrophage cholesterol efflux occurs at all stages of atherosclerosis and protects cells from free cholesterol and oxysterol-induced toxicity. The ATP-binding cassette transporters ABCA1 and ABCG1 are responsible for the major part of macrophage cholesterol efflux to serum or HDL in macrophage foam cells, but other less efficient pathways such as passive efflux are also involved. Recent studies have shown that the sterol efflux activities of ABCA1 and ABCG1 modulate macrophage expression of inflammatory cytokines and chemokines as well as lymphocyte proliferative responses. In macrophages, transporter deficiency causes increased signaling via various Toll-like receptors including TLR4. These studies have shown that the traditional roles of HDL and ABC transporters in cholesterol efflux and reverse cholesterol transport are mechanistically linked to antiinflammatory and immunosuppressive functions of HDL. The underlying mechanisms may involve modulation of sterol levels and lipid organization

Journal

Arteriosclerosis, Thrombosis, and Vascular Biology – Wolters Kluwer Health

Published: Feb 1, 2010

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