ATP-binding cassette sub-family A member 1 (ABCA1) and ATP-binding cassette sub-family G member 1 (ABCG1) (ABCA1/ABCG1)

ATP-binding cassette sub-family A member 1 (ABCA1) and ATP-binding cassette sub-family G member 1 (ABCG1) are essential transmembrane transporters that coordinate the efflux of cellular cholesterol, representing the first and rate-limiting step of reverse cholesterol transport (RCT) (Matsuo, 2022; Tang et al., 2022). ABCA1 primarily transfers cholesterol and phospholipids to lipid-poor apolipoprotein A-I (apoA-I) to initiate the formation of nascent high-density lipoprotein (HDL) particles, whereas ABCG1 facilitates the subsequent efflux of cholesterol to mature HDL (Vaughan & Oram, 2006; Matsuo, 2022). By preventing excessive lipid accumulation in peripheral tissues, particularly in macrophages, these transporters inhibit the formation of foam cells and the progression of atherosclerotic plaques (Tall et al., 2007; Westerterp et al., 2016). Beyond their role in lipid homeostasis, ABCA1 and ABCG1 exert anti-inflammatory effects by modulating the cholesterol content of lipid rafts, which in turn regulates the signaling of innate immune receptors like Toll-like receptor 4 (TLR4) (Yvan-Charvet et al., 2010; Matuz Mares, 2025). Pharmacological targeting of these transporters, often through Liver X Receptor (LXR) agonists, aims to enhance cholesterol clearance and reduce cardiovascular risk, although systemic activation of these pathways can lead to side effects such as hepatic steatosis and hypertriglyceridemia (Haas, 2022; Matuz Mares, 2025). Recent research also highlights their potential roles in Alzheimer's disease through the clearance of amyloid-beta and in metabolic health by maintaining pancreatic beta-cell function (Matsuo, 2022; Kruit et al., 2010).

Other names

ABC1TGDHDLDT1CERPABC8WHITE1Cholesterol efflux regulatory proteinATP-binding cassette transporter 1ATP-binding cassette transporter G1

Transcriptional upregulation via LXR/RXR activation to enhance cellular cholesterol efflux and reverse cholesterol transport.