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Molecular Pharmacology

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Research ArticleArticle

Human and Rat Liver UDP-Glucuronosyltransferases Are Targets of Ketoprofen Acylglucuronide

Nadège Terrier, Etienne Benoit, Claire Senay, Françoise Lapicque, Anna Radominska-Pandya, Jacques Magdalou and Sylvie Fournel-Gigleux
Molecular Pharmacology July 1999, 56 (1) 226-234; DOI: https://doi.org/10.1124/mol.56.1.226
Nadège Terrier
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Etienne Benoit
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Claire Senay
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Françoise Lapicque
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Anna Radominska-Pandya
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Jacques Magdalou
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Sylvie Fournel-Gigleux
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Abstract

Acylglucuronides formed from carboxylic acids by UDP-glucuronosyltransferases (UGTs) are electrophilic metabolites able to covalently bind proteins. In this study, we demonstrate the reactivity of the acylglucuronide from the nonsteroidal anti-inflammatory drug, ketoprofen, toward human and rat liver UGTs. Ketoprofen acylglucuronide irreversibly inhibited the glucuronidation of 1-naphthol and 2-naphthol catalyzed by human liver microsomes or by the recombinant rat liver isoform, UGT2B1, which is the main isoform involved in the glucuronidation of the drug. A decrease of about 35% in the glucuronidation of 2-naphthol was observed when ketoprofen acylglucuronide was produced in situ in cultured V79 cells expressing UGT2B1. Inhibition was always associated with the formation of microsomal protein-ketoprofen adducts. The presence of these covalent adducts within the endoplasmic reticulum of cells expressing UGT2B1 was demonstrated following addition of ketoprofen to culture medium by immunofluorescence microscopy with antiketoprofen antibodies. Immunoblots of liver microsomes incubated with ketoprofen acylglucuronide and probed with antiketoprofen antibodies revealed the presence of several protein adducts; among those was a major immunoreactive protein at 56 kDa, in the range of the apparent molecular mass of UGTs. The adduct formation partially prevented the photoincorporation of the UDP-glucuronic acid (UDP-GlcUA) analog, [β-32P]5N3UDP-GlcUA, on the UGTs, suggesting that ketoprofen glucuronide covalently reacted with the UDP-GlcUA binding domain. Finally, UGT purification from rat liver microsomes incubated with ketoprofen glucuronide led to the isolation of UGT adducts recognized by both anti-UGT and antiketoprofen antibodies, providing strong evidence that UGTs are targets of this metabolite.

Footnotes

    • Received February 18, 1999.
    • Accepted April 20, 1999.
  • Send reprint requests to: Dr. S. Fournel-Gigleux, Unité Mixte de Recherche 7561 Centre National de la Recherche Scientifique-Université Henri Poincaré Nancy 1, Faculty of Medicine, BP 184 54505 Vandoeuvre-lès-Nancy, France. E-mail:sfg{at}facmed.u-nancy.fr

  • This work was supported by the Région Lorraine, the Ministère des Affaires Etrangères, and the Association de Recherche sur la Polyarthrite. It is in partial fulfillment of the doctoral thesis of N.T.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 56 (1)
Molecular Pharmacology
Vol. 56, Issue 1
1 Jul 1999
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Research ArticleArticle

Human and Rat Liver UDP-Glucuronosyltransferases Are Targets of Ketoprofen Acylglucuronide

Nadège Terrier, Etienne Benoit, Claire Senay, Françoise Lapicque, Anna Radominska-Pandya, Jacques Magdalou and Sylvie Fournel-Gigleux
Molecular Pharmacology July 1, 1999, 56 (1) 226-234; DOI: https://doi.org/10.1124/mol.56.1.226

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Research ArticleArticle

Human and Rat Liver UDP-Glucuronosyltransferases Are Targets of Ketoprofen Acylglucuronide

Nadège Terrier, Etienne Benoit, Claire Senay, Françoise Lapicque, Anna Radominska-Pandya, Jacques Magdalou and Sylvie Fournel-Gigleux
Molecular Pharmacology July 1, 1999, 56 (1) 226-234; DOI: https://doi.org/10.1124/mol.56.1.226
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