Lipoprotein is Macromolecules of Protein and lipid,, lipids are transported in Plasma in form of Lipoprotein. they are four major classes of lipoprotein chylomicron VLDL IDL LDL HDL Chylomicron is form of lipoprotein which is prepared in enterocyte ,transport in blood through lacteal vessel because due to large size chylomicron does not enter into blood directly apo E protein is present on IDL and chylomicron remanents ,apo E receptor help the liver take up these both lipoprotein (IDL,Chylomicron)
Apo E activate LDL receptor for receptor mediate endocytosis.
Apo E activate the hepatic lipase enzyme which convert IDL into LDL