Cellular membrane (lipid bilayer)

The cellular membrane, more accurately termed the lipid bilayer, is the foundational structural component of all biological membranes, including the plasma membrane and internal organelle membranes[1][2][3][4][5][7][8]. It consists of two sheets of amphipathic phospholipids, oriented so that their hydrophilic (water-attracting) heads face the cell exterior and cytoplasm (aqueous surroundings), while their hydrophobic (water-repellent) fatty acid tails face inward, forming a nonpolar core. This arrangement creates a selective permeability barrier, allowing the cell to control the movement of ions and molecules[3][4][7]. Cholesterol and glycolipids are integrated, modulating membrane fluidity and mechanical properties[5][7]. While the bilayer itself is not a traditional drug target (like a receptor or enzyme), its integrity and properties are central for cell viability, and several drugs exploit or disrupt its barrier function. Protein channels and transporters embedded in the bilayer mediate specific biological functions such as signal transduction and molecular transport. Membrane dysfunction or composition changes are associated with various diseases, but the bilayer is a target of physical or chemical disruption, not a classic molecular target amenable to drug specificity[3][5][7]. Note: "Cellular membrane / lipid bilayer" is a molecular structure common to all cells; it is not a specific therapeutic target in itself but rather the context or environment in which targets such as receptors, channels, or enzymes reside. For most purposes, "cellular membrane / lipid bilayer" is too general to serve as a canonical therapeutic target.

Other names

cell membraneplasma membranephospholipid bilayerbiological membranelipid membrane

Drugs interact with the cellular membrane through various mechanisms, including disruption or permeabilization of the bilayer structure, alteration of membrane fluidity, specific interaction with membrane lipids (e.g., ergosterol binding by amphotericin B), pore formation, and solubilization of membrane lipids.