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ABCA1 and ABCG1 or ABCG4 act sequentially to remove cellular cholesterol and generate cholesterol-rich HDL

Vaughan, Ashley M. ; Oram, John F.

Journal of lipid research, 2006-11, Vol.47 (11), p.2433-2443 [Periódico revisado por pares]

United States: Elsevier Inc

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Título:
ABCA1 and ABCG1 or ABCG4 act sequentially to remove cellular cholesterol and generate cholesterol-rich HDL
Autor: Vaughan, Ashley M. ; Oram, John F.
Assuntos: Adenosine Triphosphate - metabolism ; Animals ; ATP Binding Cassette Transporter 1 ; ATP binding cassette transporter A1 ; ATP binding cassette transporter G1 ; ATP binding cassette transporter G4 ; ATP Binding Cassette Transporter, Subfamily G ; ATP Binding Cassette Transporter, Subfamily G, Member 1 ; ATP-Binding Cassette Transporters - genetics ; ATP-Binding Cassette Transporters - physiology ; Cell Membrane - metabolism ; Cholesterol - metabolism ; Chromatography, Gel ; Cricetinae ; Dose-Response Relationship, Drug ; high density lipoprotein ; Lipids - chemistry ; Lipoproteins, HDL - metabolism ; Mice ; Mice, Knockout ; Phospholipids - metabolism
É parte de: Journal of lipid research, 2006-11, Vol.47 (11), p.2433-2443
Descrição: Recent developments in lipid metabolism have shown the importance of ATP binding cassette transporters (ABCs) in controlling cellular and total body lipid homeostasis. ABCA1 mediates the transport of cholesterol and phospholipids from cells to lipid-poor apolipoprotein A-I (apoA-I), whereas ABCG1 and ABCG4 mediate the transport of cholesterol from cells to lipidated lipoproteins. ABCA1, ABCG1, and ABCG4 are all expressed in cholesterol-loaded macrophages, and macrophages from ABCA1 and ABCG1 knockout mice accumulate cholesteryl esters. Here, we show that the lipidated particles generated by incubating cells overexpressing ABCA1 with apoA-I are efficient acceptors for cholesterol released from cells overexpressing either ABCG1 or ABCG4. The cholesterol released to the particles was derived from a cholesterol oxidase-accessible plasma membrane pool in both ABCG1 and ABCG4 cells, which is the same pool of cholesterol shown previously to be removed by high density lipoproteins. ABCA1 cells incubated with apoA-I generated two major populations of cholesterol- and phospholipid-rich lipoprotein particles that were converted by ABCG1 or ABCG4 cells to one major particle population that was highly enriched in cholesterol. These results suggest that ABCG1 and ABCG4 act in concert with ABCA1 to maximize the removal of excess cholesterol from cells and to generate cholesterol-rich lipoprotein particles.
Editor: United States: Elsevier Inc
Idioma: Inglês

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ABCA1 and ABCG1 or ABCG4 act sequentially to remove cellular cholesterol and generate cholesterol-rich HDL

Vaughan, Ashley M. ; Oram, John F.

United States: Elsevier Inc

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