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Human liver glucuronidation of benzidine

S R Babu1, V M Lakshmi, I S Owens

  • 1VA Medical Center, Department of Biochemistry, St. Louis, MO.

Carcinogenesis
|September 1, 1994
PubMed
Summary
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Benzidine glucuronidation, a key pathway in aromatic amine bladder cancer, was studied in humans. N-glucuronidation of benzidine and its metabolite N-acetyl-benzidine is a major human metabolic pathway.

Area of Science:

  • Toxicology
  • Pharmacokinetics
  • Metabolism

Background:

  • Glucuronidation is a significant metabolic pathway for aromatic amines, implicated in bladder cancer.
  • Benzidine glucuronidation in humans has not been previously assessed, representing a knowledge gap.

Purpose of the Study:

  • To investigate the glucuronidation of benzidine in human liver microsomes and slices.
  • To identify potential inhibitors and the UDP-glucuronosyltransferases involved in benzidine metabolism.

Main Methods:

  • Incubation of benzidine with human liver microsomes and slices.
  • Enzyme kinetic analysis (Km, Vmax) and inhibition studies using various agents.
  • Assessment of benzidine and N-acetyl-benzidine N-glucuronide formation in intact liver tissue.

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Main Results:

  • Human liver microsomes exhibited Michaelis-Menten kinetics for benzidine glucuronidation.
  • Several agents, including estriol and bilirubin, inhibited benzidine N-glucuronide formation, suggesting multiple UDP-glucuronosyltransferases involved.
  • Human liver slices demonstrated significant N-glucuronidation of both benzidine and N-acetyl-benzidine, with N-acetylation influencing the proportion of glucuronidation.

Conclusions:

  • N-glucuronidation is a major metabolic pathway for benzidine in humans.
  • The extent of N-acetylation impacts the subsequent glucuronidation of benzidine and its metabolite.
  • Specific UDP-glucuronosyltransferases responsible for benzidine glucuronidation were not identified among the tested cDNA clones.