DNA and cellular proteins (N/A)

DNA and cellular proteins represent a broad, non-specific collective of molecular targets for traditional cytotoxic chemotherapeutic agents, most notably alkylating agents and platinum-based compounds (NIH, 2023). These agents exert their therapeutic effects by forming highly reactive electrophilic intermediates that create covalent bonds, or adducts, with nucleophilic sites on DNA—primarily the N7 position of guanine—and various functional groups on cellular proteins (StatPearls, 2023). The resulting DNA-DNA or DNA-protein cross-links physically obstruct the molecular machinery required for DNA replication and RNA transcription, leading to cell cycle arrest and programmed cell death (PubMed, 2018). While DNA damage is often the primary driver of the anti-tumor response, the simultaneous modification and inactivation of cellular proteins, such as enzymes involved in DNA repair and metabolic pathways, further disrupts cellular homeostasis and contributes to the drug's overall efficacy. Because these interactions are not specific to malignant cells, they are associated with a narrow therapeutic index and significant systemic toxicities, particularly in rapidly dividing healthy tissues like the bone marrow and gastrointestinal epithelium.

Other names

DNAGenomic DNACellular macromoleculesNuclear and cytoplasmic proteins

Covalent modification and cross-linking of DNA and cellular proteins, leading to the inhibition of DNA replication, transcription, and enzymatic functions, which ultimately induces apoptosis.