Cellular DNA and intracellular proteins

Cellular DNA and intracellular proteins refers to the broad, non-specific molecular targets of certain cytotoxic agents, most notably polyfunctional alkylating agents like thiotepa (FDA Label). These agents exert their therapeutic effects by releasing reactive intermediates, such as ethylenimine radicals, which covalently bond to nucleophilic sites on both deoxyribonucleic acid (DNA) and various intracellular proteins (PubChem CID 5453). The modification of DNA leads to the formation of inter-strand and intra-strand cross-links, which physically obstruct the machinery required for DNA replication and transcription, ultimately triggering apoptosis in rapidly dividing cells (StatPearls: Alkylating Agents). Simultaneously, the alkylation of intracellular proteins can denature enzymes and disrupt structural components, further compromising cellular viability. This multi-targeted mechanism is utilized in the treatment of several cancers, including breast, ovarian, and bladder cancer, as well as in conditioning regimens for bone marrow transplantation. However, because these agents do not distinguish between cancerous and healthy cells, they are associated with significant toxicity, particularly myelosuppression and genotoxicity. The non-specific nature of this target profile also makes such agents useful as broad-spectrum chemical sterilants and disinfectants, where they act by globally inactivating the genetic material and proteome of microbial pathogens (DrugBank BE0000943). Despite their clinical utility, the potential for inducing secondary malignancies due to permanent DNA damage remains a major safety concern.

Other names

DNA and proteinsCellular macromoleculesNucleic acids and proteinsGenomic DNA and cellular proteins

Covalent modification (alkylation or cross-linking) of DNA bases and protein functional groups, leading to DNA damage and protein denaturation.