Biological lipid bilayer

The biological lipid bilayer is a universal structural component of all cellular life, primarily composed of two layers of amphiphilic phospholipids that form a continuous barrier around the cell and its organelles (Wikipedia, 2024). It functions as a selective permeability barrier, regulating the transport of ions and metabolites while providing a dynamic scaffold for membrane-bound proteins involved in signal transduction and energy metabolism (StatPearls, 2023). In the context of pharmacology, the lipid bilayer is a critical target for several classes of antimicrobial and antifungal agents, such as polymyxins and polyenes, which exploit differences in lipid composition to disrupt membrane integrity (PubMed, 2021). For instance, Amphotericin B binds to ergosterol within fungal lipid bilayers to create transmembrane pores, leading to lethal ion leakage (NIH, 2022). Beyond infection, alterations in bilayer fluidity and lipid composition are implicated in the progression of cancer and neurodegenerative diseases, where membrane remodeling affects cell signaling and survival (Nature Reviews Molecular Cell Biology, 2020). However, targeting the lipid bilayer presents significant therapeutic challenges, as drugs must distinguish between pathogen and host membranes to avoid systemic toxicities like nephrotoxicity and hemolysis (Journal of Biological Chemistry, 2019).

Other names

Cell membranePlasma membranePhospholipid bilayerCytoplasmic membraneUnit membrane

Drugs targeting the biological lipid bilayer primarily act through physical disruption of the membrane's structural integrity. This includes the formation of transmembrane pores (e.g., polyenes), detergent-like solubilization of the membrane (e.g., polymyxins), or the extraction of essential lipid components like cholesterol or ergosterol, all of which lead to the loss of the electrochemical gradient, cytoplasmic leakage, and subsequent cell death (PubMed, 2021; StatPearls, 2023).