Why is LDL oxidized in atherosclerosis?
Oxidized LDLs are cytotoxic to vascular cells [47, 48] and promote their apoptosis [49, 50] with ensuing release in the subendothelial space of lipids and lysosomal enzymes, enhancing the progression of the atherosclerotic plaque [47] and the production of the necrotic core.
Which lipids cause atherosclerosis?
High serum lipid levels, especially the elevated level of low-density lipoprotein (LDL), have been shown to be strongly related to the development of atherosclerosis. It is generally accepted that atherosclerotic lesions are initiated via an enhancement of LDL uptake by monocytes and macrophages.
Where do lipids accumulate in atherosclerosis?
Lipid droplets accumulate in the cytoplasm of Pericytes, macrophages, and smooth muscle cells and lead to change their appearance. All risk factors of atherosclerosis cause an inflammatory response. Inflammatory cytokines cause the accumulation of intracellular lipids.
What is the relationship between lipoproteins and atherosclerosis?
In the pathogenesis of atherosclerosis, triglyceride-rich lipoproteins augment endothelial dysfunction, facilitate monocyte infiltration into the arterial wall, and increase activation of pro-inflammatory genes; moreover, triglyceride-enriched HDL particles exhibit reduced cholesterol efflux capacity.
How does LDL become OxLDL?
How Oxidized LDL Forms. The oxidation of LDL is thought to occur when LDL cholesterol particles in your body react with free radicals; unstable molecules that are produced as a result of normal metabolism, a disease, or exposure to toxins.
What is LDL oxidation?
Oxidized LDL (oxLDL) represents a variety of modification of both lipid and apolipoprotein B (apoB) components by lipid peroxidation. This promotes atherosclerosis through inflammatory and immunologic mechanisms that lead to the formation of macrophage foam cells.
How do lipids contribute to cardiovascular disease?
LDL cholesterol can stick to artery walls causing the formation of blockages or plaques. As the plaques build up (a condition called atherosclerosis) they reduce or block the flow of blood to the heart, which can result in chest pain and lead to a heart attack.
Where are blood lipids derived?
Lipoprotein production originates from dietary fat-forming chylomicrons in the plasma, and by the production of very low-density lipoproteins (VLDL) in liver, Nelson, (2013).
How are cholesterol associated with atherosclerosis?
If your cholesterol is too high, it builds up on the walls of your arteries. Over time, this buildup is known as atherosclerosis. This condition causes arteries to become narrowed, and the narrowed blood vessels reduce blood flow to the heart.
Which lipoproteins are involved in causing atherosclerosis?
The McKnight laboratory is interested in the structure and function and folding of a variety of proteins including Apolipoprotein B (ApoB), the protein component of low density lipoprotein (LDL). LDL is the “bad cholesterol” transporter, and clinically, elevated levels of LDL are associated with atherosclerosis.
Which lipoproteins protect against atherosclerosis?
It is believed that atherogenic lipoproteins, such as LDL and lipoprotein remnants, that float in the VLDL IDL region, promote atherosclerosis, and antiatherogenic lipoproteins, such as HDL, protect from atherosclerosis.