Cellular membrane lipid domains

Cellular membrane lipid domains, frequently referred to as lipid rafts, are small, dynamic, and heterogeneous microdomains enriched in cholesterol and sphingolipids that compartmentalize cellular processes (Simons & Ikonen, 1997; Pike, 2006). These domains serve as essential scaffolding platforms for the assembly of signaling complexes, influencing pathways related to cell survival, growth, and immune responses (Mollinedo & Gajate, 2015). In pathological states such as cancer, lipid rafts are often reorganized to facilitate constitutive signaling through pathways like PI3K/Akt, while in neurodegenerative diseases, they serve as sites for the processing of amyloid precursor protein (Escribá et al., 2008). Therapeutic intervention, known as membrane lipid therapy or melitherapy, involves using drugs to alter the lipid composition or physical structure of these domains to modulate protein-lipid interactions (Escribá, 2006). For instance, the synthetic lipid edelfosine accumulates in these domains to trigger apoptosis in cancer cells, while cholesterol-depleting agents like statins can indirectly disrupt raft-dependent signaling (Mollinedo & Gajate, 2015). Furthermore, many pathogens, including HIV and SARS-CoV-2, utilize these domains as entry portals, making them targets for antiviral strategies (Simons & Sampaio, 2011). Consequently, targeting the biophysical properties of membrane domains represents a promising strategy for treating diverse diseases by regulating the environment in which membrane proteins function.

Other names

Lipid raftsMembrane microdomainsDetergent-resistant membranesLiquid-ordered domainsCaveolae

Modulation of membrane lipid composition and biophysical properties to alter signaling protein recruitment and activity, often by disrupting raft assembly or inducing apoptosis through raft-mediated pathways.