PMID: 16505586Mar 1, 2006Paper

ABCA1 and biogenesis of HDL

Journal of Atherosclerosis and Thrombosis
Shinji Yokoyama

Abstract

Mammalian somatic cells do not catabolize cholesterol and therefore export it for sterol homeostasis at cell and whole body levels. This mechanism may reduce intracellularly accumulated excess cholesterol, and thereby would contribute to the prevention or cure of the initial stage of atherosclerotic vascular lesion. High-density lipoprotein (HDL) plays a central role in this reaction by removing cholesterol from cells and transporting it to the liver, the major cholesterol catabolic site. Two independent mechanisms have been identified for cellular cholesterol release. The first is non-specific diffusion-mediated cholesterol "efflux" from the cell surface, in which cholesterol is trapped by various extracellular acceptors including lipoproteins. Extracellular cholesterol esterification of HDL provides a driving force for the net removal of cell cholesterol by this pathway, and some cellular factors may enhance this reaction. The other mechanism is an apolipoprotein-mediated process to generate new HDL particles by removing cellular phospholipid and cholesterol. This reaction is mediated by a membrane protein ATP-binding cassette transporter A1 (ABCA1), and lipid-free or lipid-poor helical apolipoproteins recruit cellular phosph...Continue Reading

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