Lipid raft microdomain (LR)

Lipid raft microdomains are specialized, highly ordered regions of the cell membrane enriched in cholesterol, sphingolipids, and saturated phospholipids. They function as dynamic platforms that organize and concentrate signaling molecules, such as G protein-coupled receptors and tyrosine kinases, to facilitate efficient cellular communication and intracellular trafficking (Simons & Sampaio, 2011). In malignant cells, these microdomains are often upregulated or structurally altered, providing a scaffold for oncogenic signaling pathways like PI3K/Akt and Ras/MAPK that promote uncontrolled proliferation, survival, and epithelial-mesenchymal transition (Greenlee et al., 2021). Targeting lipid rafts has emerged as a novel therapeutic strategy, utilizing agents like alkylphospholipids (e.g., edelfosine) that selectively accumulate in cancer cell rafts to induce apoptosis by reorganizing death receptors or inhibiting survival signals (Mollinedo & Gajate, 2015). Despite their potential, the primary challenge in targeting these domains lies in achieving selectivity for tumor cells over healthy tissues to minimize systemic toxicity (Li et al., 2022).

Other names

Membrane raftCholesterol-rich microdomainDetergent-resistant membraneDRMLipid raft

Disruption of membrane microdomain structural integrity through cholesterol depletion or lipid analog incorporation, leading to the modulation of raft-resident oncogenic signaling pathways and induction of apoptosis.