Acrolein and reactive ifosfamide metabolites

Acrolein and reactive ifosfamide metabolites are toxic chemical species produced during the hepatic biotransformation of the prodrug ifosfamide, an oxazaphosphorine alkylating agent used in cancer treatment (StatPearls, 2023). While the metabolism of ifosfamide generates the active antineoplastic agent ifosforamide mustard, it also produces acrolein (2-propenal) and chloroacetaldehyde (PubChem, CID 7847). Acrolein is a highly reactive unsaturated aldehyde that, when concentrated in the bladder, causes extensive damage to the urothelium, leading to hemorrhagic cystitis (NIH, 2022). Chloroacetaldehyde is primarily associated with the nephrotoxicity and neurotoxicity often observed during high-dose ifosfamide therapy (PubMed, PMID 15154615). To prevent these complications, Mesna is co-administered to provide a source of sulfhydryl groups in the urine. These thiol groups chemically neutralize acrolein and other reactive metabolites, forming stable, non-toxic conjugates that are safely eliminated, thereby protecting the urinary tract without compromising the drug's systemic efficacy (FDA, Ifex Label).

Other names

2-propenalIfosforamide mustardChloroacetaldehydeUrotoxic metabolites

Mesna (sodium 2-mercaptoethanesulfonate) acts as a regional detoxifying agent in the urinary tract. Its active thiol group undergoes a Michael addition with the alpha,beta-unsaturated carbonyl group of acrolein and reacts with other reactive ifosfamide metabolites to form stable, non-toxic thioether conjugates that are excreted in the urine (StatPearls, 2023; FDA Label).