General cellular thiols and biomolecules

General cellular thiols and biomolecules represent a broad class of endogenous nucleophilic entities, including small molecules like glutathione (GSH) and macromolecules such as proteins, lipids, and nucleic acids. These components are vital for maintaining cellular redox homeostasis, providing structural integrity, and facilitating enzymatic catalysis (Source: PubMed, PMID: 22503472). In pharmacology and toxicology, this category is often identified as the site of non-specific covalent interaction for reactive drug metabolites or electrophilic therapeutic agents. For example, the hepatotoxicity of acetaminophen is mediated by its metabolite NAPQI, which depletes cellular glutathione and binds to various protein thiols, leading to mitochondrial dysfunction and cell death (Source: StatPearls, NBK441917). Conversely, certain therapeutic strategies involve the use of thiol-donating agents, such as Mesna or N-acetylcysteine, to protect these endogenous biomolecules from damage caused by chemotherapeutic agents like cyclophosphamide or toxic metabolites (Source: FDA; PubChem, CID 23662354). Understanding the interaction between drugs and this collective target is essential for assessing the safety profile and therapeutic index of many reactive compounds.

Other names

Endogenous nucleophilesCellular nucleophilesThiol-containing compoundsGlutathione and protein thiolsReactive oxygen species scavengers

Covalent modification, alkylation, or conjugation of endogenous nucleophilic sites by electrophilic drugs or their reactive metabolites.