Cholesterol Transport Mechanisms in Cardiovascular Health

Cholesterol transport underpins both physiological membrane function and the pathogenesis of atherosclerotic cardiovascular disease. Low-density lipoproteins (LDL) deliver cholesterol to peripheral tissues via receptor‐mediated endocytosis, whereas high-density lipoproteins (HDL) promote reverse cholesterol transport by scavenging excess cellular cholesterol and ferrying it to the liver for excretion. Key membrane proteins regulate these pathways: ATP-binding cassette transporter A1 (ABCA1) initiates HDL formation by exporting phospholipids and cholesterol to lipid-poor apolipoprotein A-I; ABCG1 further enriches nascent HDL with cholesterol; and scavenger receptor BI (SR-BI) mediates selective HDL cholesteryl ester uptake into hepatocytes and steroidogenic cells and supports bidirectional cholesterol exchange in macrophages. Intracellular trafficking of cholesterol involves endosomal networks and lipid transfer proteins that redistribute sterols between organelles. Impaired efflux or excessive uptake leads to foam-cell formation, necrotic core expansion and plaque instability. At the systemic level, nuclear receptors such as liver X receptors (LXR) sense cholesterol load and coordinate expression of efflux transporters, thus coupling lipid flux to inflammatory and metabolic programmes. Therapeutic modulation of these routes—through LXR agonists, CETP inhibitors or HDL-mimetic peptides—continues to be explored to restore cholesterol balance, reduce plaque burden and prevent acute cardiovascular events.

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Cholesterol Transport Mechanisms in Cardiovascular Health publication trend

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Technical terms

Reverse cholesterol transport: Pathway by which excess cholesterol is extracted from peripheral cells, transferred to HDL and delivered to the liver for removal from the body.

Scavenger receptor BI (SR-BI): High-affinity receptor that mediates selective uptake of cholesteryl esters from HDL and promotes bidirectional cholesterol exchange.

ATP-binding cassette transporter A1 (ABCA1): Membrane protein that exports cholesterol and phospholipids to apolipoprotein A-I, initiating the formation of nascent HDL particles.

ATP-binding cassette transporter G1 (ABCG1): Transporter that facilitates cholesterol efflux to mature HDL following ABCA1 activity, enhancing overall sterol removal.

Efferocytosis: Process by which phagocytes engulf and clear apoptotic cells, crucial for preventing necrosis and inflammation within atherosclerotic plaques.

References

1. Macrophage SR-BI mediates efferocytosis via Src/PI3K/Rac1 signaling and reduces atherosclerotic lesion necrosis[S]. Journal of Lipid Research (2015).
2. ABCA1 and ABCG1 or ABCG4 act sequentially to remove cellular cholesterol and generate cholesterol-rich HDL. Journal of Lipid Research (2006).
3. Scavenger Receptor BI Promotes High Density Lipoprotein-mediated Cellular Cholesterol Efflux*. Journal of Biological Chemistry (1997).
4. Mechanism of Scavenger Receptor Class B Type I-mediated Selective Uptake of Cholesteryl Esters from High Density Lipoprotein to Adrenal Cells*. Journal of Biological Chemistry (1999).