Ergosterol and Cholesterol

Ergosterol and cholesterol are the primary sterols found in the cell membranes of fungi and animals, respectively, serving critical roles in maintaining membrane fluidity and structural integrity (Source: PubChem CID 444679, CID 5997). Ergosterol is a vital target for antifungal medications; polyene drugs like amphotericin B bind to ergosterol to form transmembrane pores that lead to lethal ion leakage, while azole drugs inhibit the enzyme lanosterol 14-alpha-demethylase to disrupt its synthesis (Source: PMID: 24163363). Cholesterol is essential for mammalian cell signaling, lipid raft formation, and as a precursor for steroid hormones and bile acids (Source: StatPearls, Physiology, Cholesterol). In human health, cholesterol is a major therapeutic target for cardiovascular disease management, primarily through the use of statins which inhibit HMG-CoA reductase (Source: NIH, Statins). The structural similarity between ergosterol and cholesterol is a significant factor in drug toxicity; for instance, the nephrotoxicity of amphotericin B is attributed to its secondary binding to human cholesterol (Source: FDA Label, Fungizone). Because these are two distinct chemical entities with different biological origins and therapeutic contexts, they are typically classified as separate targets in pharmacological databases.

Other names

Provitamin D2Ergosta-5,7,22-trien-3beta-olCholest-5-en-3beta-ol3beta-Hydroxycholest-5-ene

Direct binding to membrane sterols to induce pore formation and cellular leakage, or inhibition of biosynthetic enzymes such as HMG-CoA reductase and lanosterol 14-alpha-demethylase.