Glucuronidation of PhIP and N-OH-PhIP by UDP-glucuronosyltransferase 1A10

Ryan W. Dellinger, Gang Chen, Andrea S. Blevins-Primeau, Jacek Krzeminski, Shantu Amin, Philip Lazarus

Research output: Contribution to journalArticle

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Abstract

The UDP-glucuronosyltransferase (UGT) 1A10 is an extra-hepatic enzyme that plays an important role in the glucuronidation of a variety of endogenous and exogenous substances and is expressed throughout the aerodigestive and digestive tracts. Two classes of carcinogens that target the colon, heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons, are known to be detoxified by the UGT family of enzymes. Recently, our laboratory demonstrated that UGT1A10 has considerably more activity against polycyclic aromatic hydrocarbons in vitro than any other UGT family member. In this study, we focused on the glucuronidation of the HCA, 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine (PhIP), and its bioactivated metabolite, N-hydroxy-2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (N-OH-PhIP). We demonstrated that UGT1A10 exhibited a significantly higher glucuronidation rate against PhIP and N -OH-PhIP than any other UGT family member in vitro using whole-cell homogenates of HEK293 cells over-expressing individual UGTs. Kinetic analysis revealed a 9- and 22-fold higher level of activity for UGT1A10 homogenates as compared with the next most active UGT, UGT1A1, against N -OH-PhIP as determined by maximum rate/apparent Michaelis constant (Vmax/ KM) at the N3 and N2 positions, respectively. The polymorphic UGT1A10139Lys variant exhibited a 2- to 16-fold decrease in glucuronidation activity against PhIP and N-OH-PhIP, as compared with the wild-type UGT1A10139Glu isoform. These data suggest that UGT1A10 is the most active UGT against PhIP and N-OH-PhIP and that UGT1A10 may play an important role in susceptibility to HCA-induced colon cancer.

Original languageEnglish (US)
Pages (from-to)2412-2418
Number of pages7
JournalCarcinogenesis
Volume28
Issue number11
DOIs
StatePublished - Nov 1 2007

Fingerprint

Glucuronosyltransferase
Amines
Polycyclic Aromatic Hydrocarbons
2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine
hydroxide ion
HEK293 Cells
Enzymes
Carcinogens
Colonic Neoplasms
Gastrointestinal Tract
Protein Isoforms
Colon
bilirubin uridine-diphosphoglucuronosyl transferase 1A10
Liver

All Science Journal Classification (ASJC) codes

  • Cancer Research

Cite this

Dellinger, Ryan W. ; Chen, Gang ; Blevins-Primeau, Andrea S. ; Krzeminski, Jacek ; Amin, Shantu ; Lazarus, Philip. / Glucuronidation of PhIP and N-OH-PhIP by UDP-glucuronosyltransferase 1A10. In: Carcinogenesis. 2007 ; Vol. 28, No. 11. pp. 2412-2418.
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Dellinger, RW, Chen, G, Blevins-Primeau, AS, Krzeminski, J, Amin, S & Lazarus, P 2007, 'Glucuronidation of PhIP and N-OH-PhIP by UDP-glucuronosyltransferase 1A10', Carcinogenesis, vol. 28, no. 11, pp. 2412-2418. https://doi.org/10.1093/carcin/bgm164

Glucuronidation of PhIP and N-OH-PhIP by UDP-glucuronosyltransferase 1A10. / Dellinger, Ryan W.; Chen, Gang; Blevins-Primeau, Andrea S.; Krzeminski, Jacek; Amin, Shantu; Lazarus, Philip.

In: Carcinogenesis, Vol. 28, No. 11, 01.11.2007, p. 2412-2418.

Research output: Contribution to journalArticle

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T1 - Glucuronidation of PhIP and N-OH-PhIP by UDP-glucuronosyltransferase 1A10

AU - Dellinger, Ryan W.

AU - Chen, Gang

AU - Blevins-Primeau, Andrea S.

AU - Krzeminski, Jacek

AU - Amin, Shantu

AU - Lazarus, Philip

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