Cancer cell lipid membrane and lipid raft

Cancer cell lipid membranes and lipid rafts are specialized, highly ordered microdomains within the plasma membrane characterized by high concentrations of cholesterol, sphingolipids, and saturated phospholipids (Mollinedo & Gajate, 2015). In malignant cells, these structures are often reorganized or overexpressed to facilitate the clustering of oncogenic signaling proteins, such as growth factor receptors (EGFR), Akt, and Ras, which drive uncontrolled proliferation, survival, and metastasis (Greenlee et al., 2021). Unlike traditional therapies that target specific proteins, membrane lipid therapy (melitherapy) focuses on altering the physical properties and lipid composition of these membranes to disrupt the assembly of these signaling platforms (Escribá et al., 2015). Therapeutic agents like alkylphospholipids (e.g., edelfosine) and synthetic fatty acids (e.g., 2-hydroxyoleic acid) selectively accumulate in tumor cell membranes, leading to the displacement of signaling proteins from rafts and the subsequent induction of apoptosis (Vivas et al., 2019). This target is particularly relevant for overcoming drug resistance, as it addresses the fundamental structural environment that supports multiple redundant signaling pathways (Staubach & Hanisch, 2011). By targeting the membrane rather than a single protein, these therapies can potentially circumvent the mutations that often render traditional kinase inhibitors ineffective.

Other names

Tumor cell membraneLipid microdomainMembrane raftDetergent-resistant membraneDRMCholesterol-rich microdomain

Modulation of membrane lipid composition and physical properties (fluidity and packing) to disrupt the structural integrity of lipid rafts, thereby inhibiting raft-associated oncogenic signaling and inducing apoptosis (Mollinedo & Gajate, 2020; Escribá et al., 2015).