Membrane microdomain (LR)

Membrane microdomains, commonly known as lipid rafts, are specialized, highly ordered regions of the plasma membrane enriched in cholesterol, sphingolipids, and gangliosides (Source 1.1.4, 1.1.5). These domains serve as dynamic organizing centers that compartmentalize cellular processes by facilitating the assembly of signaling molecules and regulating protein trafficking (Source 1.1.4, 1.3.1). In various diseases, lipid rafts are hijacked by pathogens such as SARS-CoV-2 and HIV for cellular entry or serve as platforms for aberrant signaling in cancer and neurodegeneration (Source 1.1.1, 1.1.5, 1.3.4). For instance, the clustering of amyloid-beta with ganglioside GM1 in rafts is a key event in Alzheimer's disease pathogenesis (Source 1.1.3). Therapeutic strategies targeting these microdomains involve disrupting their structural integrity through cholesterol depletion or modulating the localization of raft-associated proteins to restore normal cellular function (Source 1.3.2, 1.5.1, 1.5.4). However, the ubiquity of these domains across all cell types poses significant challenges for achieving therapeutic selectivity (Source 1.3.2).

Other names

Lipid raftGanglioside-rich microdomainDetergent-resistant membrane (DRM)Glycosphingolipid-enriched microdomain (GEM)CaveolaePlanar raft

Drugs targeting membrane microdomains primarily act by disrupting their structural integrity through the depletion of cholesterol or sphingolipids, thereby altering the localization and activity of raft-associated signaling proteins. Some agents, such as alkylphospholipids, induce apoptosis by promoting the clustering of death receptors within these domains, while others, like certain antidepressants, modulate signaling by translocating proteins out of the raft environment (Source 1.5.1, 1.5.2, 1.5.3, 1.5.4).