Metabolic activation of promutagens, detectable in ames' salmonella assay, by 5000 × g supernatant of rat ventral prostate

Peter Söderkvist, Leif Busk, Rune Toftgård, Jan åke Gustafsson

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Induction of aryl hydrocarbon hydroxylase (AHH) and 7-ethoxyresorufin-O-deethylase (7-EOD) activities as well as of benzo[a]pyrene (BP) metabolite formation in rat prostatic microsomes has been demonstrated after treatment with β-naphthoflavone (BNF). The capacity to convert promutagenic compounds to ultimate mutagenic metabolites in the Ames' Salmonella assay by 5000 × g supernatant of rat ventral prostate was investigated. Male rats were treated with BNF, polychlorinated biphenyls (PCB; Arochlor 1254), phenobarbital (PB) and the vehicle, corn oil. PCB or BNF pretreatment increased the AHH- and 7-EOD activities 100-200-fold in the rat prostate 5000 × g supernatant (S-5 fraction). Epoxide hydrolase (EH) and glutathione-S-transferase (GST) activities were not affected while UDP-glucuronosyltransferase (UDP-GT) was increased 2.2- and 2.5-fold by PCB and BNF, respectively. PB did not significantly affect any of the enzyme activities measured. A dose-dependent increase in mutagenic response versus amount of 5000 × g supernatant and promutagen (aflatoxin B1 (AFB), 2-aminofluorene (2-AF), BP) was observed. The most pronounced activation was obtained with S-5 fraction from BNF- or PCB-treated rats. The great sensitivity of prostatic AHH to certain inducers and the capacity of the prostate to produce mutagenic metabolites might be of importance for initiation of prostatic cancer by environmental factors.

Original languageEnglish (US)
Pages (from-to)151-163
Number of pages13
JournalChemico-Biological Interactions
Volume46
Issue number2
DOIs
StatePublished - Sep 1 1983

Keywords

  • Induction - Benzo[a]pyrene - Ames test - Mutagenesis - Rat prostate

ASJC Scopus subject areas

  • Toxicology

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