Foam cell oxidative pathways and lipid metabolism

Foam cell oxidative pathways and lipid metabolism refer to the integrated biochemical processes within macrophages that lead to the formation of foam cells, the primary component of atherosclerotic plaques (Moore & Tabas, Cell, 2011). This process is initiated by the excessive uptake of modified lipoproteins, such as oxidized LDL (oxLDL), via scavenger receptors like CD36 and SR-A (Chistiakov et al., J Mol Med, 2016). Once internalized, cholesterol is processed through metabolic pathways involving esterification by ACAT1 for storage or efflux via transporters like ABCA1 and ABCG1 (Tall & Yvan-Charvet, Nat Rev Immunol, 2015). Oxidative stress, driven by enzymes such as NADPH oxidase, promotes the generation of reactive oxygen species that further oxidize intracellular lipids and activate inflammatory pathways. The accumulation of these lipids occurs when the rate of uptake and esterification surpasses the cell's capacity for cholesterol efflux, resulting in the characteristic foamy appearance of the macrophages. Drugs targeting these pathways, such as statins and PCSK9 inhibitors, primarily work by reducing the availability of circulating LDL or enhancing the clearance of lipids from the vessel wall. Therapeutic strategies also explore the use of antioxidants and LXR agonists to directly modulate macrophage lipid handling and reduce oxidative damage. Consequently, these pathways represent a major focus for preventing cardiovascular disease and stabilizing vulnerable plaques.

Other names

Macrophage foam cell formationAtherosclerotic lipid metabolismOxidative lipid processingMacrophage lipid accumulation

Reduction of circulating LDL levels, inhibition of lipoprotein-associated phospholipase A2, or enhancement of reverse cholesterol transport to prevent macrophage lipid loading (Moore & Tabas, Cell, 2011; Tall & Yvan-Charvet, Nat Rev Immunol, 2015).