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PCSK9 inhibition therapies dramatically reduce cholesterol levels in the bloodstream, and seem set to take over from statins as the next generation approach to cholesterol management in the context of cardiovascular disease risk. Atherosclerosis results from the ability of a combination of damaged lipids – such as oxidized cholesterol – and overall level of lipids to overwhelm macrophage cells called in to clean up points of irritation in blood vessel walls. A feedback loop of inflammation and cell death sets in, as macrophages, filled with lipids and in the process of dying, call for further help, secreting cytokines that produce inflammation. The fatty deposits that weaken and narrow blood vessels in the later stages of atherosclerosis are composed of dead macrophages and the lipids they failed to clean up.

PCSK9 inhibition therapiescholesterol levelsstatinscardiovascular diseaseAtherosclerosislipidsoxidized cholesteroloverwhelm macrophage cellscytokinesfatty deposits

One way to try to slow down this runaway process of damage is to reduce the input of cholesterol. This is the basis of the success of statins in lowering cardiovascular risk, and the evidence suggests that further lowering of cholesterol levels will reduce that risk to a greater degree. This is still, however, only a stepping stone on the way

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