The origin and metabolism of a nascent pre-beta high density lipoprotein involved in cellular cholesterol efflux

• Autorzy: Wroblewska M.
• Języki publikacji: EN

Abstrakty

EN

 The pre-β HDL fraction constitutes a heterogeneous population of discoid nascent HDL particles. They transport from 1 to 25 % of total human plasma apo A-I. Pre-β HDL particles are generated de novo by interaction between ABCA1 transporters and monomolecular lipid-free apo A-I. Most probably, the binding of apo A-I to ABCA1 initiates the generation of the phospholipid-apo A-I complex which induces free cholesterol efflux. The lipid-poor nascent pre-β HDL particle associates with more lipids through exposure to the ABCG1 transporter and apo M. The maturation of pre-β HDL into the spherical α-HDL containing apo A-I is mediated by LCAT, which esterifies free cholesterol and thereby forms a hydrophobic core of the lipoprotein particle. LCAT is also a key factor in promoting the formation of the HDL particle containing apo A-I and apo A-II by fusion of the spherical α-HDL containing apo A-I and the nascent discoid HDL containing apo A-II. The plasma remodelling of mature HDL particles by lipid transfer proteins and hepatic lipase causes the dissociation of lipid-free/lipid-poor apo A-I, which can either interact with ABCA1 transporters and be incorporated back into pre-existing HDL particles, or eventually be catabolized in the kidney. The formation of pre-β HDL and the cycling of apo A-I between the pre-β and α-HDL particles are thought to be crucial mechanisms of reverse cholesterol transport and the expression of ABCA1 in macrophages may play a main role in the protection against atherosclerosis.

Słowa kluczowe

EN

man; human metabolism; high density lipoprotein; cellular cholesterol efflux; HDL-cholesterol; apolipoprotein; free cholesterol; lecithin; phospholipid; cholesterol transport; atherosclerosis; protection; plasma; maturation; triacylglycerol

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2011
• Tom: 58
• Numer: 3
• Opis fizyczny: p.275-285,fig.,ref.

Twórcy

autor

Wroblewska M.

• Department of Laboratory Medicine, Medical University of Gdansk, Gdansk, Poland

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