Cellular lipid bilayer membrane sterols

The cellular lipid bilayer is the fundamental structural framework of biological membranes, with sterols serving as essential modulators of membrane physical properties. In mammalian cells, cholesterol is the primary sterol, whereas ergosterol predominates in fungi. These molecules are vital for maintaining membrane fluidity, providing structural integrity, and organizing lipid rafts—specialized microdomains that coordinate signal transduction and protein trafficking (Source: PubMed, PMC3010174). Pharmacologically, membrane sterols are the direct targets of polyene antifungals like Amphotericin B, which exploit the structural differences between fungal ergosterol and human cholesterol to create lethal pores in the fungal membrane (Source: StatPearls, NBK532956). While these drugs are highly effective, their clinical use is often limited by toxicity arising from cross-reactivity with human cholesterol, particularly in the kidneys (Source: NIH, LiverTox). Additionally, membrane sterol composition is a critical factor in the pathogenesis of atherosclerosis and the entry mechanisms of various viruses, including HIV and SARS-CoV-2, making them a focal point for both therapeutic intervention and diagnostic monitoring (Source: Nature Reviews Molecular Cell Biology).

Other names

Membrane cholesterolErgosterolLipid raftsPlasma membrane sterolsMembrane lipids

Polyene antifungal drugs bind directly to membrane sterols (specifically ergosterol in fungi) to form transmembrane pores, leading to the leakage of intracellular ions and subsequent cell death. In other contexts, agents may sequester cholesterol to disrupt lipid raft microdomains, thereby inhibiting viral entry or modulating cell signaling pathways (Source: StatPearls, NBK532956; PubChem, CID 5280965).