Insights Into the Role of Monocyte Lipid Efflux in HDL Formation and Inflammation

ABCA1-deficient mice: insights into the role of monocyte lipid efflux in HDL formation and inflammation.

Studies with ATP-binding cassette transporter (ABCA1)-deficient mice have been critical in demonstrating the relation between ABCA1 expression, cellular lipid efflux, and HDL metabolism. The phenotype of the ABCA1-deficient mouse parallels the phenotype observed in human Tangier disease, including substantial reductions in both apolipoprotein B and apolipoprotein AI with confounding affects on ...

High density lipoproteins and atherosclerosis: emerging aspects

High density lipoproteins (HDL) promote the efflux of excess cholesterol from peripheral tissues to the liver for excretion. This ability is responsible for the most relevant anti-atherogenic effect of HDL. The ability of HDL to promote cholesterol efflux results also in the modulation of a series of responses in the immune cells involved in atherosclerosis, including monocyte-macrophages, B an...

Macrophage functions in atherosclerosis.

A therosclerosis is a chronic inflammatory disease of the arterial wall instigated by the excessive accumulation of lipoproteins; monocyte recruitment and their differentiation into macrophages in the subendothelial space. Repeated failure of innate immune responses to clear subintimal low-density lipoprotein (LDL), results in the deposition of lipid-laden macrophages or foam cells. Foam cells ...

Pro- or anti-inflammatory role of apolipoprotein A-1 in high-density lipoproteins?

Apolipoprotein A-1 (apoA-1) is the principal protein fraction of high-density lipoprotein (HDL), conferring to the latter many of its pleiotropic atheroprotective functions. After its effect on cholesterol efflux, the second most studied feature of apoA-1 is its anti-inflammatory property. In addition, it interferes with lipid peroxidation and innate immune receptors. These anti-inflammatory ef...

HDL-C, ABCA1-mediated cholesterol efflux, and lipoprotein(a): insights into a potential novel physiologic role of lipoprotein(a).