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Cardiovascular disease - Blood lipoproteins
Cardiovascular disease - Blood lipoproteins
Because lipids such as cholesterol, triglycerides, and phospholipids are nonpolar and insoluble in water, they must be bound to proteins, forming complex particles called lipoproteins, to be transported in the watery medium of blood. Low-density lipoproteins, which are the main transporters of cholesterol in the blood, carry cholesterol from the liver to body cells, including those in the arteries, where it can contribute to plaque. Multiple lines of evidence point to high levels of LDL cholesterol as causal in the development of CHD, and LDL is the main blood lipoprotein targeted by intervention efforts. Furthermore, clinical trials have demonstrated that LDL-lowering therapy reduces heart attacks and strokes in people who already have CHD.
High-density lipoproteins, on the other hand, are thought to transport excess cholesterol to the liver for removal, thereby helping to prevent plaque formation. HDL cholesterol is inversely correlated with CHD risk; therefore intervention efforts aim to increase HDL cholesterol levels. Another blood lipoprotein form, the very-low-density lipoprotein (VLDL), is also an independent CHD risk factor, but to a lesser extent than LDL and HDL. As the major carrier of triglyceride (fat) in the blood, VLDL is particularly elevated in people who are overweight and in those with diabetes and metabolic syndrome.
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