Membrane lipid raft

A **membrane lipid raft** is a specialized, dynamic microdomain of the cellular plasma membrane, enriched in cholesterol and sphingolipids, and often containing specific proteins such as glycosylphosphatidylinositol (GPI)-anchored proteins and certain palmitoylated proteins[1][3][5][9]. Lipid rafts are typically small (10–200 nm), highly dynamic, and can coalesce into larger platforms through protein-protein and protein-lipid interactions[3][9]. They are not isolated proteins or gene products, but rather biophysical domains that serve as organizing centers to compartmentalize cellular processes by concentrating specific signaling molecules and receptors, and regulating their interactions and trafficking within the membrane[2][5][7]. Lipid rafts play essential roles in **signal transduction**, especially in immune cells (e.g., B cell and T cell receptor signaling), regulation of membrane protein trafficking, membrane fluidity, endocytosis, apoptosis, and spatial organization of the plasma membrane[1][2][3][5][6]. They are implicated in the pathophysiology of cancer, cardiovascular disease, inflammation, neurodegenerative disorders, and infection because they function as portals for pathogen entry, modulate immune responses, and influence cell death pathways[3][6][7]. However, as a membrane structure and not a classical drug target (like a receptor, enzyme, or transporter), membrane lipid rafts are not directly "targetable" by traditional small molecule drugs—their therapeutic targeting remains an area of research rather than routine practice[5][9]. **Note:** Lipid rafts are **not a druggable protein, receptor, or enzyme**, but rather biophysical membrane domains. Listing them as a therapeutic target is incorrect—they are important in cell biology and disease but not a single, defined molecular target analogous to established drug targets[5][9]. As such, canonical abbreviation, specific biomarkers, interacting drugs, or mechanisms of drug action do not apply to "membrane lipid raft" in the conventional biomedical target sense.

Other names

Lipid raftMembrane raftMembrane microdomain