Membrane cholesterol and phospholipids

Membrane cholesterol and phospholipids constitute the primary structural framework of the biological lipid bilayer, essential for maintaining cell permeability, fluidity, and mechanical stability (Nature Reviews Molecular Cell Biology, 2017). Cholesterol is a key regulator of membrane order and is a major component of lipid rafts, which facilitate signal transduction and viral entry (Journal of Lipid Research, 2016). Phospholipids provide the matrix for membrane proteins and act as reservoirs for signaling molecules like diacylglycerol and inositol trisphosphate (StatPearls, 2023). In clinical practice, these lipids are targeted by membrane-active drugs; for instance, polyene antifungals like Amphotericin B bind to ergosterol (a fungal cholesterol analog) to create lethal pores, while lipopeptides like Daptomycin target bacterial phospholipids (NCBI, 2022). Therapeutic challenges include achieving selectivity to avoid damaging human cell membranes, which can lead to significant toxicities, such as the nephrotoxicity and hemolysis associated with polyene macrolides (PubMed, 2021).

Other names

Cell membrane lipidsLipid bilayer componentsPlasma membrane sterols and glycerophospholipidsMembrane lipid matrix

Drugs targeting membrane lipids typically act through physical disruption of the bilayer. This includes the formation of ion-permeable pores (e.g., polyenes binding to ergosterol), sequestration of lipids required for membrane integrity (e.g., cyclodextrins), or the induction of rapid depolarization by inserting into the membrane and causing ion leakage (e.g., lipopeptides) (StatPearls, 2023; NCBI, 2022).