Cellular membrane lipid raft

Cellular membrane lipid rafts are small (10–200 nm), heterogeneous, and highly dynamic microdomains within the plasma membrane that are enriched in cholesterol, sphingolipids, and specific proteins like glycosylphosphatidylinositol (GPI)-anchored proteins (Pike, 2006). These domains act as specialized platforms that compartmentalize cellular processes, facilitating signal transduction, protein sorting, and membrane trafficking by concentrating or segregating signaling molecules (Simons & Toomre, 2000). In pathological contexts, lipid rafts are frequently exploited by pathogens, such as HIV-1 and SARS-CoV-2, for cellular entry and budding, and they serve as critical sites for the accumulation of proteins involved in neurodegenerative diseases like Alzheimer's (Michel & Bakovic, 2007). In oncology, lipid rafts facilitate the assembly of pro-survival signaling complexes, such as those involving Akt and EGFR, making them attractive targets for anti-cancer therapies (Mollinedo & Gajate, 2015). Therapeutic intervention typically involves the use of agents that deplete cholesterol or sequester lipids to disrupt raft integrity, thereby modulating downstream signaling or blocking infection.

Other names

Lipid raftMembrane microdomainDetergent-resistant membraneDRMCholesterol-rich domain

Pharmacological modulation of lipid rafts primarily involves the depletion or sequestration of cholesterol, which disrupts the structural integrity of these domains and subsequently inhibits the assembly of raft-associated signaling complexes or prevents the entry of pathogens (Simons & Toomre, 2000; Mollinedo & Gajate, 2015).