SPECIES-DIFFERENCE IN N-HYDROXYLATION OF A TRYPTOPHAN PYROLYSIS PRODUCT IN RELATION TO MUTAGENIC ACTIVATION
- 1 January 1981
- journal article
- research article
- Vol. 41 (11), 4518-4522
Abstract
Metabolic activation of a tryptophan pyrolysate, 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P-2), in liver microsomes from rats, mice, hamsters, guinea pigs and rabbits was studied to know whether N-hydroxylation is a common obligatory step for mutagenic activation of Trp-P-2. Among hepatic microsomes obtained from untreated animals the highest activity of Trp-P-2 N-hydroxylase was observed in microsomes from hamsters followed by those from guinea pigs, mice and rabbits. In rats the activity was low and there was no appreciable difference between the sexes. The activity of Trp-P-2 N-hydroxylase in microsomes was increased by pretreating the animals with a polychlorinated biphenyl mixture. The induction was most profound in rats, in which the activity was enhanced 257-fold as compared to that of untreated animals. The activity was also enhanced in microsomes from polychlorinated biphenyl mixture-treated rabbits, mice and hamsters, whereas the activity was increased only slightly in guinea pigs. In bacterial mutagenesis test systems using Salmonella typhimurium TA 98 the number of revertants induced by Trp-P-2 was increased in parallel with the microsomal ability of the N-hydroxylation. In all species examined N-hydroxylation is apparently an essential metabolic step for mutagenic activation of Trp-P-2.This publication has 19 references indexed in Scilit:
- Formation of Mutagens in Beef and Beef Extract During CookingScience, 1978
- SOME CURRENT PERSPECTIVES ON CHEMICAL CARCINOGENESIS IN HUMANS AND EXPERIMENTAL-ANIMALS - PRESIDENTIAL-ADDRESS1978
- Isolation and structure studies of mutagenic principles in amino acid pyrolysates.CHEMICAL & PHARMACEUTICAL BULLETIN, 1978
- Detection of carcinogens as mutagens in the Salmonella/microsome test: assay of 300 chemicals: discussion.Proceedings of the National Academy of Sciences, 1976
- IMMUNOCHEMICAL EVIDENCE FOR 6 FORMS OF RAT-LIVER CYTOCHROME P450 OBTAINED USING ANTIBODIES AGAINST PURIFIED RAT-LIVER CYTOCHROMES P450 AND P4481976
- HEPATIC-METABOLISM OF N-HYDROXY-N-METHYL-4-AMINOAZOBENZENE AND OTHER N-HYDROXY ARYLAMINES TO REACTIVE SULFURIC-ACID ESTERS1976
- Species Variations in the N - and Ring-Hydroxylation of 2-Acetylaminofluorene and Effects of 3-Methylcholanthrene Pretreatment.Experimental Biology and Medicine, 1967
- Enzymatic N-Hydroxylation of the Carcinogen 2-Acetylaminofluorene and the Metabolism of N-Hydroxy-2-acetylaminofluorene-9-14C in VitroJournal of Biological Chemistry, 1964
- CARBON MONOXIDE-BINDING PIGMENT OF LIVER MICROSOMES .2. SOLUBILIZATION PURIFICATION + PROPERTIES1964
- PROTEIN MEASUREMENT WITH THE FOLIN PHENOL REAGENTJournal of Biological Chemistry, 1951