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Apolipoprotein B is the primary apolipoprotein of chylomicrons, VLDL, Lp(a), IDL, and LDL particles (LDL—commonly known as "bad cholesterol" when in reference to both heart disease and vascular disease in general), which is responsible for carrying fat molecules (), including cholesterol, around the body to all cells within all tissues.
ApoB is an integral apoprotein whereas the others are peripheral apoproteins. Apolipoprotein synthesis such as ApoA4 in hypothalamus involves in the integration of signals for regulation of food intake [ 5 ] which is regulated by vagal nerve and cholecystokinin .
"Some people even see LDL cholesterol and ApoB decrease, and many don't see any change," he says in the video. There are many risk factors for heart disease beyond cholesterol, Norwitz noted.These ...
ApoA, ApoB, ApoC, ApoE are apolipoproteins; green particles are phospholipids; T is triglyceride; C is cholesterol ester. A lipoprotein is a biochemical assembly whose primary function is to transport hydrophobic lipid (also known as fat ) molecules in water, as in blood plasma or other extracellular fluids .
Chylomicron structure ApoA, ApoB, ApoC, ApoE (apolipoproteins); T (triacylglycerol); C (cholesterol); green (phospholipids). Chylomicrons transport lipids absorbed from the intestine to adipose, cardiac, and skeletal muscle tissue, where their triglyceride components are hydrolyzed by the activity of the lipoprotein lipase, allowing the released free fatty acids to be absorbed by the tissues.
Fifty percent of IDLs are recognized by receptors in the liver cells because of the apolipoprotein B-100 (apoB-100) and apoE they contain and are endocytosed. The other 50% of IDL lose apoE; when their cholesterol content becomes greater than the content of triglyceride, they become LDL, with apoB-100 as the primary apolipoprotein.
[citation needed] In general, IDL, somewhat similar to low-density lipoprotein (LDL), transports a variety of triglyceride fats and cholesterol and, like LDL, can also promote the growth of atheroma. [citation needed] VLDL is a large, triglyceride-rich lipoprotein secreted by the liver that transports triglyceride to adipose tissue and muscle.
In familial hypercholesterolemia, a mutation in the LDLR, PCSK9, or APOB is usually the reason for this and these mutations result in high LDL cholesterol. [8] In combined hyperlipidemia, there is an overproduction of apoB-100 in the liver. [9] This causes high amounts of LDL and VLDL molecules to form. [9]