Cellular plasma membrane lipid bilayer (PM) (PM)

The cellular plasma membrane lipid bilayer is a fundamental biological structure composed of a double layer of amphiphilic phospholipids, sterols, and proteins that defines the boundary of the cell (StatPearls, 2023). It serves as a selectively permeable barrier, regulating the influx of nutrients and the efflux of waste while maintaining the electrochemical gradients necessary for life (Britannica, 2026). Beyond its structural role, the lipid bilayer acts as a dynamic platform for cell signaling, where specific lipid microdomains like rafts organize receptors and transporters (NIH, 2015). In various diseases, including cancer and neurodegeneration, the composition and fluidity of the membrane are often altered, leading to dysfunctional signaling (MDPI, 2023). Therapeutic targeting of the bilayer is well-established in anti-infectives, where drugs like polymyxins and amphotericin B disrupt the integrity of microbial membranes (ACS, 2020). Modern pharmacological approaches, such as membrane lipid therapy, aim to treat chronic diseases by precisely modulating membrane lipid composition to restore normal cellular function (NIH, 2015).

Other names

Cell membraneCytoplasmic membranePlasmalemmaPhospholipid bilayerBiological membrane

Drugs targeting the lipid bilayer typically act through pore formation, membrane disruption, or the modulation of membrane fluidity and organization. Some agents, like daptomycin, cause rapid depolarization by inserting into the membrane, while others like amphotericin B bind specific sterols to create lethal ion channels. Emerging membrane lipid therapy (MLT) involves using synthetic fatty acids to alter the lipid composition and microdomain organization (e.g., lipid rafts), thereby regulating the activity of membrane-bound signaling proteins.