Cellular lipid bilayer membrane

The cellular lipid bilayer membrane is a fundamental biological structure composed of two layers of amphipathic phospholipids that form a continuous barrier around cells and organelles. It serves as a selective permeability barrier, regulating the passage of ions and molecules while providing a matrix for membrane proteins involved in signaling and transport (StatPearls, 2023). In the context of pharmacology, the membrane itself is a critical target for various antimicrobial and antifungal agents which exploit differences in lipid composition between pathogens and host cells (Nature Reviews Microbiology, 2017). For instance, polyene antifungals like Amphotericin B bind to ergosterol within the fungal bilayer to create lethal pores (Journal of Biological Chemistry, 2014). Similarly, lipopeptide antibiotics like daptomycin insert into bacterial membranes, causing rapid depolarization and cell death (Clinical Infectious Diseases, 2003). Beyond direct disruption, the membrane's physical state, such as its fluidity and thickness, influences the activity of embedded receptors and channels, which is a key consideration in the mechanism of general anesthetics (Biophysical Journal, 2016). Alterations in membrane lipid composition are also associated with diseases like cancer and neurodegeneration, where changes in membrane rafts can affect cell signaling pathways (Frontiers in Cell and Developmental Biology, 2020).

Other names

Biological membranePlasma membranePhospholipid bilayerCytoplasmic membrane

Direct membrane disruption, pore formation, ionophore activity, and alteration of membrane fluidity or curvature.