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Experimental model for investigating bladder carcinogen metabolism using the isolated rat urinary bladder
L Airoldi1, M Bonfanti, C Magagnotti
1Laboratory of Environmental Pharmacology and Toxicology, Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
IARC Scientific Publications
|January 1, 1987
Summary
The rat urinary bladder metabolizes the carcinogen N-nitrosobutyl-(4-hydroxybutyl)amine (NBHBA) into N-nitrosobutyl(3-carboxypropyl)amine (NBCPA). This metabolic conversion is linked to tumor induction in laboratory animals.
Area of Science:
- Toxicology
- Carcinogenesis
- Metabolism
Background:
- Chemical carcinogens pose risks to urinary bladder health.
- Understanding carcinogen metabolism is crucial for risk assessment.
- The rat urinary bladder's metabolic capacity for specific carcinogens requires elucidation.
Purpose of the Study:
- To investigate the metabolic fate of N-nitrosobutyl-(4-hydroxybutyl)amine (NBHBA) in isolated rat urinary bladders.
- To determine if NBHBA is converted to a known carcinogenic metabolite.
- To assess the metabolic transformation of N-nitrosodi-n-butylamine (NDBA) by the rat urinary bladder.
Main Methods:
- Incubation of isolated rat urinary bladders with NBHBA.
- Time-course analysis of NBHBA and its metabolite NBCPA formation.
- Incubation of isolated rat urinary bladders with NDBA to identify metabolites.
Main Results:
- NBHBA was progressively oxidized to NBCPA over 120 minutes.
- NBCPA formation increased with time (up to 61%), while NBHBA decreased (down to 25%).
- NDBA incubation yielded small amounts of NBHBA (0.13%) and NBCPA (0.06%).
Conclusions:
- The rat urinary bladder possesses the metabolic capability to convert NBHBA to NBCPA.
- This metabolic pathway is significant and time-dependent.
- The bladder's metabolism of NDBA also produces these compounds, suggesting a role in NDBA-induced carcinogenesis.