Urotoxic metabolites

Urotoxic metabolites are toxic breakdown products that accumulate in the urine, most notably after metabolism of cytotoxic chemotherapy agents such as cyclophosphamide and ifosfamide. The best-characterized urotoxic metabolite is acrolein, which is markedly irritant to the urothelium and causes hemorrhagic cystitis and other urinary tract damage. These metabolites are not molecular targets but rather harmful byproducts that require detoxification; the most widely used clinical agent for their neutralization is mesna, which acts by covalently binding these compounds to prevent bladder toxicity. Urotoxic metabolites are not a singular entity, protein, enzyme, or receptor. This term should therefore not be treated as a canonical molecular target; refer instead to specific molecules (e.g., acrolein) or to mechanisms of uroprotection (e.g., "acrolein neutralization" or "bladder-protective agents").

Other names

Toxic urinary metabolitesharmful urinary metaboliteschemotherapy-generated urinary toxinsoxazaphosphorine urotoxic metabolitesacrolein (most prominent specific example)

Mesna acts as a nucleophile that binds the urotoxic metabolites (such as acrolein), forming inactive, harmless conjugates that are excreted in urine.