Cellular and microbial membranes

Cellular and microbial membranes are fundamental biological barriers composed primarily of phospholipid bilayers interspersed with proteins and sterols. They serve as the primary interface between a cell and its environment, regulating the transport of ions, nutrients, and waste products while maintaining electrochemical gradients essential for life (Alberts et al., Molecular Biology of the Cell, 2002). In pharmacology, these membranes are critical targets for antimicrobial and antifungal agents that exploit structural differences between host and pathogen (PMID: 27337121). For instance, polymyxins target the outer membrane of Gram-negative bacteria by binding to lipopolysaccharides, while polyene antifungals like amphotericin B bind to ergosterol in fungal membranes to create lethal pores (PubChem CID 5280965). Daptomycin represents another class that targets the cytoplasmic membrane of Gram-positive bacteria, causing rapid depolarization (StatPearls NBK534110). Because of the structural similarities between microbial and mammalian membranes, drugs targeting these structures often face challenges regarding therapeutic index. Systemic toxicities, such as nephrotoxicity and neurotoxicity, are common safety concerns when these agents interact non-specifically with human cellular membranes (PMID: 27337121). Despite these challenges, membrane-targeting drugs remain essential "last-resort" treatments for multi-drug resistant infections.

Other names

Biological membranePlasma membraneCytoplasmic membraneLipid bilayer

Membrane disruption, pore formation, lipid sequestration, and depolarization of the membrane potential.