High-density lipoprotein

High-density lipoprotein (HDL) is one of the five principal types of lipoproteins, which are complex assemblies of lipids and proteins that function as vehicles for lipid transport throughout the body's aqueous environment<ref>Subramanian, Avinaash,

 HDL: More Than Just Cholesterol, 
 Current Atherosclerosis Reports, 
 
 Vol. 14(Issue: 1),
 pp. 23-30,
 DOI: 10.1007/s11883-011-0215-9,
 
 
 
 Full text,</ref>.

Composition and Structure of HDL

HDL particles are typically comprised of 80-100 proteins, predominantly arranged by one, two, or three ApoA proteins. As HDL particles circulate in the bloodstream, they can enlarge by integrating more fat molecules, thereby enabling the transport of hundreds of fat molecules per particle.

Functions of HDL: Beyond Lipid Transportation

While HDL is well-known for its role in lipid transport, it has other vital functions. Notably, it plays a crucial role in reverse cholesterol transport, wherein it carries cholesterol from peripheral tissues back to the liver for excretion. This protective mechanism helps prevent the accumulation of cholesterol in the walls of arteries, reducing the risk of atherosclerosis and cardiovascular disease<ref>Schmitz, J.E.,

 HDL and reverse cholesterol transport, 
 Biochimica et Biophysica Acta, 
 
 Vol. 1631(Issue: 2),
 pp. 205-15,
 DOI: 10.1016/j.bbalip.2003.12.007,
 
 
 
 Full text,</ref>.

HDL and Health Outcomes

Studies have consistently shown a strong inverse correlation between HDL cholesterol levels and the risk of cardiovascular disease. This finding has led to the nickname "good cholesterol" for HDL, contrasting with the "bad cholesterol" label often applied to low-density lipoprotein (LDL). However, recent research has highlighted that it's the functionality of HDL, rather than its quantity, which is crucial in mediating cardiovascular risk<ref>Barter, Philip,

 HDL cholesterol, very low levels of LDL cholesterol, and cardiovascular events, 
 New England Journal of Medicine, 
 
 Vol. 357(Issue: 13),
 pp. 1301-10,
 DOI: 10.1056/NEJMoa064278,
 
 
 
 Full text,</ref>.

References

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