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HDL prevent formation of foam cells Perhaps the best-known function of HDL is the promotion of cholesterol efflux from cells. Efflux of cholesterol from foam cells leads to a reduction in foam cell formation; although the macrophages may accumulate, they are not converted into foam cells. As a result, the inflammatory process is arrested to a certain extent. Therefore, HDL is anti-inflammatory and also protects against the development of atherosclerosis. Reference: Miyazaki A, Rahim AT, Ohta T, Morino Y, Horiuchi S. High density lipoprotein mediates selective reduction in cholesteryl esters from macrophage foam cells. Biochim Biophys Acta 1992;1126:73-80. * HDL inhibit the oxidative modification of LDL HDL has protective effects in addition to promoting cholesterol efflux. One of the best known of these is the ability to inhibit the oxidation of LDL. To the extent that LDL oxidation is an important step in the development of the inflammatory process, this property of HDL is clearly anti-inflammatory. Reference: Mackness MI, Abbott C, Arrol S, Durrington PN. The role of high-density lipoprotein and lipid-soluble antioxidant vitamins in inhibiting low-density lipoprotein oxidation. Biochem J 1993;294:829-834. * Inhibition of adhesion molecules The cytokine-induced expression of adhesion molecules in endothelial cells has been shown in vitro and more recently in vivo to be inhibited by HDL, in a process that potentially blocks a very early inflammatory stage in the development of atherosclerosis. Reference: Cockerill GW, Rye K-A, Gamble JR, Vadas MA, Barter PJ. High-density lipoproteins inhibit cytokine-induced expression of endothelial cell adhesion molecules. Arterioscler Thromb Vasc Biol 1995;15:1987-1994. * With our study, we think that the earliest trigger for CAD and MI is abnormally developed endothelium or defective endothelium or endothelium dysfunction. This makes the coronary arteries more susceptible to attacks by inflammation, which eventually pro
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