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Enzyme-induced aziridine formation by rat liver microsomes
Biochemical and Biophysical Research Communications
|January 14, 1983
Summary
2-chloroethylaminobenzoquinones are stable in buffer but convert to aziridinobenzoquinones in rat liver microsomes via NADPH-dependent enzymes. Hydroquinone derivatives are key intermediates in this enzymatic cyclization.
Area of Science:
- Biochemistry
- Enzymology
- Drug Metabolism
Background:
- 2-chloroethylaminobenzoquinone derivatives exhibit varying stability in biological systems.
- Understanding their metabolic fate is crucial for assessing potential bioactivity and toxicity.
Purpose of the Study:
- To investigate the metabolic transformation of 2-chloroethylaminobenzoquinone derivatives in rat liver microsomes.
- To elucidate the enzymatic mechanisms and intermediates involved in the conversion to aziridinobenzoquinones.
Main Methods:
- Incubation of 2-chloroethylaminobenzoquinone derivatives with rat liver microsomes.
- Analysis of reaction products using appropriate biochemical assays.
- Study of the enzymatic cyclization of a related naphthoquinone derivative to infer reaction mechanisms.
Main Results:
- 2-chloroethylaminobenzoquinones were stable in buffer solutions with macromolecules like DNA and proteins.
- In the presence of rat liver microsomes and NADPH, these compounds were gradually converted to aziridinobenzoquinones.
- The conversion proceeded via the elimination of hydrogen chloride, indicating an enzymatic process.
Conclusions:
- Rat liver microsomes, via NADPH-dependent enzymes, catalyze the conversion of 2-chloroethylaminobenzoquinones to aziridinobenzoquinones.
- Hydroquinone derivatives are identified as critical intermediates in the enzymatic formation of aziridines.
- This metabolic pathway highlights the bioactivation of certain benzoquinone derivatives.