Cellular membrane and lipid bilayer

The cellular membrane, primarily composed of a phospholipid bilayer, serves as the fundamental structural boundary of all living cells and many organelles (NIH, 2022). It functions as a selective barrier that regulates the passage of ions and molecules, facilitates cell signaling through embedded proteins, and maintains cellular homeostasis (Nature Education, 2014). In pharmacology, the lipid bilayer itself is a critical therapeutic target, particularly for antimicrobial agents that exploit differences between pathogen and host membrane compositions (Frontiers in Pharmacology, 2021). For instance, polyene antifungals like amphotericin B bind to ergosterol in fungal membranes to create pores, while lipopeptide antibiotics like daptomycin disrupt bacterial membrane integrity (StatPearls, 2023). Beyond direct targeting, liposomal bilayers are extensively used in drug delivery systems to encapsulate therapeutic agents, improving solubility and reducing systemic toxicity (Journal of Controlled Release, 2012). Understanding membrane dynamics is essential for treating infections, managing cancer through membrane-active peptides, and developing advanced nanomedicines.

Other names

Plasma membranePhospholipid bilayerCytoplasmic membraneLiposomal bilayerCell membrane

Drugs targeting the lipid bilayer typically act by inducing pore formation, increasing membrane permeability, or causing physical disruption of the membrane structure through detergent-like effects (Nature Reviews Microbiology, 2017). Some agents bind specifically to membrane components like ergosterol or lipid II to initiate these processes, leading to the leakage of essential intracellular contents and subsequent cell death (StatPearls, 2023).