<prompt> Which of the following contains highest protein content?TriglyceridesHDLLDLVLDL  <response>: Ans. b HDL. Ref. Harper, Biochemistry, 25th ed., 268PROPERTIES OF PLASMA LIPOPROTEINS LipoproteinMajor lipidElectrophoretic mobilityMajor apoproteinsProtein content1ChylomicronTriglycerideNoneB-48, A-I, IV-2Very low density VLDLTriglyceridePre-betaB-100, E, C-I, II, III-3intermediateTriglyceride density IDLcholestery! estersBetaB-100, E-4Low density LDLCholesteryl estersBetaB-100-5High density HDLPhospholipids cholesterolAlphaA-I, IIHighest LIPOPROTEINFUNCTIONSChylomicron- Delivers dietary triglycerides to peripheral tissues and dietary cholesterol to liver. MH 2003 - Secreted by intestinal epithelial cells. - Levels are classically increased in lipoprotein lipase deficiency AIIMS 99. - Excess causes pancreatitis, lipemia retinalis, and eruptive xanthomas.VLDLDelivers hepatic triglycerides to peripheral tissues. - Secreted by liver. - Excess causes pancreatitis.LDL- Delivers hepatic cholesterol to peripheral tissues. - Formed by lipoprotein lipase modification of VLDL in the peripheral tissue. - Taken up by target cells via receptor-mediated endocytosis. - Classically increased in familial hypercholesterolemia. - Most atherogenic MH 2003HDLMediates centripetal transport of cholesterol reverse cholesterol transport - Acts as a precursor for apoC and apoE which are needed for chylomicron and VLDL metabolism. - Secreted from both liver and intestine. - Aptly known as good cholesterol 