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Cellular Cholesterol Transport–Microdomains, Molecular Acceptors and Mechanisms

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Abstract

“Reverse” cholesterol transport (RCT) from peripheral tissues to the liver is believed to play a major role in preventing accumulation of this lipid locally. Lipid-poor (prebeta-migrating) high-density lipoprotein (prebeta-HDL) plays a key and probably rate-limiting role in RCT, even though only a small proportion of the cholesterol content of circulating HDL originates from RCT. Normal RCT is explained here on the basis of a two-compartment recycling model. Prebeta-HDL is lipidated in interstitial fluid and lymph by ATP-dependent lipid transporters. These particles are then passed to the plasma compartment, where they become lipid-filled under the influence of the lecithin:cholesterol acyltransferase (LCAT) reaction without further input from transporters. In atherosclerosis, where activated macrophages are uniquely in contact with plasma, lipid transporters can directly stimulate RCT driven by LCAT.

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Correspondence to Christopher J. Fielding .

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© 2009 Springer-Verlag Berlin Heidelberg

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Fielding, C.J. (2009). Cellular Cholesterol Transport–Microdomains, Molecular Acceptors and Mechanisms. In: Ehnholm, C. (eds) Cellular Lipid Metabolism. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00300-4_12

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