Fate and distribution of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in rats

Carcinogenesis. 1991 Jun;12(6):1073-8. doi: 10.1093/carcin/12.6.1073.

Abstract

Fischer 344 rats were given a single dose of 0.60 mg/animal of [2-14C]2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) by gavage; and radioactivity contained in feces, urine, blood, serum proteins, hemoglobin, and tissues was determined at 12, 24, 48 and 96 h after dosing. One major and four minor radioactivity-containing fractions were found in the urine and one major and two minor radioactivity-containing fractions were found in the feces. The feces was the major route of excretion, representing 78% of dose during the first 24 h, and unchanged PhIP in the feces accounted for 51% of the dose. Unmetabolized PhIP was also shown to be the major radioactive fraction in bile and feces from animals given a single dose by i.p. injection. Blood contained a small fraction of the dose and the major, persistently-bound form of PhIP in the blood was to hemoglobin. At 12 h after administration of the dose the colon and cecum contained the highest concentration of radioactivity, while at later times the kidney and liver showed the highest concentration. Of the tissue-contained radioactivity 80-90% was ethanol insoluble at time points later than 24 h, suggesting that it was covalently bound to macromolecules.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Bile / metabolism
  • Carbon Radioisotopes
  • Chromatography, High Pressure Liquid
  • Colon / metabolism
  • Feces / chemistry
  • Imidazoles / pharmacokinetics*
  • Male
  • Mutagens / pharmacokinetics*
  • Rats
  • Rats, Inbred F344
  • Tissue Distribution

Substances

  • Carbon Radioisotopes
  • Imidazoles
  • Mutagens
  • 2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine