Glucuronidation of Carcinogen Metabolites by Complementary DNA-expressed Uridine 5'-Diphosphate Glucuronosyltransferases

Peter I. Mackenzie, Louise Rodbourn, Takashi Iyanagi

    Research output: Contribution to journalArticlepeer-review

    41 Citations (Scopus)

    Abstract

    Five UDP glucuronosyltransferases (UGT) were synthesized from complementary DNAs expressed in COS 7 cells and were tested for their capacities to glucuronidate a range of 2-acetylaminofluorene and benzo-(a)pyrene-hydroxylated metabolites. Three forms, UGT 1*06, UGT2B1, and UGT2B2 [names of UGT forms follow recommended nomenclature (B. B. Burchell et al, DNA Cell Biol., 10: 487-494, 1991)], had similar capacities to glucuronidate the reactive metabolite, A/-hydroxy-2-acetyl-aminofluorene. The less reactive 1-, 3-, 5-, and 8-hydroxy derivatives of this aromatic amine were glucuronidated by UGT 1*06 and UGT2B2 to varying degrees, but these were not substrates of UGT2B1. The three isozymes also glucuronidated phenolic metabolites of benzo(a)pyrene. UGT 1*06 was more active toward 2- and 5-hydroxybenzo(a)pyrene, whereas UGT2B1 preferentially glucuronidated the 4- and 11-hydroxy derivatives and UGT2B2 preferentially glucuronidated the 1-, 2-, 8-, and 9-hydroxy metabolites. Two other UDP glucuronosyltransferases, UGT2B3 and UGT2B6, that glucuronidated testosterone when expressed in COS 7 cells were both inactive toward all the carcinogen metabolites tested. These results demonstrate that the glucuronidation of metabolites of 2-acetylaminofluorene and benzo(α)pyrene is mediated by at least three UDP glucuronosyltransferases and that each form glucuronidates a unique spectrum of metabolites.

    Original languageEnglish
    Pages (from-to)1529-1533
    Number of pages5
    JournalCancer Research
    Volume53
    Issue number7
    Publication statusPublished - 1 Apr 1993

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