High Density Lipoprotein Biogenesis, Cholesterol Efflux, and Immune Cell Function

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  • Mary G. Sorci-Thomas
    From the Department of Pathology, Section on Lipid Sciences (M.G.S-T.), and the Department of Biochemistry (M.J.T.), Wake Forest School of Medicine, Winston-Salem, NC.
  • Michael J. Thomas
    From the Department of Pathology, Section on Lipid Sciences (M.G.S-T.), and the Department of Biochemistry (M.J.T.), Wake Forest School of Medicine, Winston-Salem, NC.

Abstract

<jats:p>This review provides a summary of recent research on the role of high-density lipoprotein (HDL)/apolipoprotein A-I cholesterol efflux and immune cell function. Plasma concentrations of HDL have been known to inversely correlate with risk for coronary vascular disease. Bulk transport of HDL cholesterol from the peripheral tissues to the liver is a major pathway, termed reverse cholesterol transport, responsible for maintaining whole body cholesterol homeostasis. In addition to participating in this pathway, HDL and apolipoprotein A-I exert anti-inflammatory effects through different pathways. One pathway that seems to be important in atherosclerosis and autoimmunity is its role in modulation of T cell activation. HDL/apolipoprotein A-I helps regulate cell signaling by accepting membrane cholesterol from ATP binding cassette transporter A1 on immune cells and, thereby, fine tuning the amount of cholesterol present in plasma membrane lipid rafts.</jats:p>

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