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Research ArticleArticle

HEPATIC AND EXTRAHEPATIC SYNTHESIS AND DISPOSITION OF DINITROPHENYL-S-GLUTATHIONE IN BILE DUCT-LIGATED RATS

Silvina S. M. Villanueva, María L. Ruiz, Carol J. Soroka, Shi-Ying Cai, Marcelo G. Luquita, Adriana M. Torres, Enrique J. Sánchez Pozzi, José M. Pellegrino, James L. Boyer, Viviana A. Catania and Aldo D. Mottino
Drug Metabolism and Disposition August 2006, 34 (8) 1301-1309; DOI: https://doi.org/10.1124/dmd.106.009415
Silvina S. M. Villanueva
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María L. Ruiz
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Carol J. Soroka
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Shi-Ying Cai
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Marcelo G. Luquita
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Adriana M. Torres
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Enrique J. Sánchez Pozzi
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José M. Pellegrino
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James L. Boyer
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Viviana A. Catania
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Aldo D. Mottino
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Abstract

The ability of the kidney and small intestine to synthesize and subsequently eliminate dinitrophenyl-S-glutathione (DNP-SG), a substrate for the multidrug resistance-associated proteins (Mrps), was assessed in bile duct-ligated (BDL) rats 1, 7, and 14 days after surgery, using an in vivo perfused jejunum model with simultaneous urine collection. A single i.v. dose of 30 μmol/kg b.wt. of 1-chloro-2,4-dinitrobenzene (CDNB) was administered, and its glutathione conjugate DNP-SG and dinitrophenyl cysteinyl glycine derivative, which is the result of γ-glutamyl-transferase action on DNP-SG, were determined in urine and intestinal perfusate by high-performance liquid chromatography. Intestinal excretion of these metabolites was unchanged at day 1, and decreased at days 7 and 14 (–39% and –33%, respectively) after surgery with respect to shams. In contrast, renal excretion was increased by 114%, 150%, and 128% at days 1, 7, and 14. Western blot studies revealed decreased levels of apical Mrp2 in liver and jejunum but increased levels in renal cortex from BDL animals, these changes being maximal between days 7 and 14. Assessment of expression of basolateral Mrp3 at day 14 postsurgery indicated preserved levels in renal cortex, duodenum, jejunum, distal ileum, and colon. Analysis of expression of glutathione-S-transferases α, μ, and π, as well as activity toward CDNB, indicates that formation of DNP-SG was impaired in liver, preserved in intestine, and increased in renal cortex. In conclusion, increased renal tubular conversion of CDNB to DNP-SG followed by subsequent Mrp2-mediated secretion into urine partially compensates for altered liver function in experimental obstructive cholestasis.

Footnotes

  • This work was supported by grants from Agencia Nacional de Promoción Científica y Tecnológica, Consejo Nacional de Investigaciones Científicas y Técnicas, and Universidad Nacional de Rosario to A.D.M., and by National Institutes of Health Grants DK 25636 to J.L.B. and the Yale Liver Center DK P30 34989.

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.106.009415.

  • ABBREVIATIONS: CDNB, 1-chloro-2,4-dinitrobenzene; DNP-SG, dinitrophenyl-S-glutathione; DNP-CG, dinitrophenyl cysteinyl glycine; Mrp1, Mrp2, and Mrp3, multidrug resistance-associated proteins 1, 2, and 3; GST, glutathione S-transferase; GSH, reduced glutathione; GSSG, oxidized glutathione.

    • Received January 19, 2006.
    • Accepted May 3, 2006.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 34 (8)
Drug Metabolism and Disposition
Vol. 34, Issue 8
1 Aug 2006
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Research ArticleArticle

HEPATIC AND EXTRAHEPATIC SYNTHESIS AND DISPOSITION OF DINITROPHENYL-S-GLUTATHIONE IN BILE DUCT-LIGATED RATS

Silvina S. M. Villanueva, María L. Ruiz, Carol J. Soroka, Shi-Ying Cai, Marcelo G. Luquita, Adriana M. Torres, Enrique J. Sánchez Pozzi, José M. Pellegrino, James L. Boyer, Viviana A. Catania and Aldo D. Mottino
Drug Metabolism and Disposition August 1, 2006, 34 (8) 1301-1309; DOI: https://doi.org/10.1124/dmd.106.009415

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Research ArticleArticle

HEPATIC AND EXTRAHEPATIC SYNTHESIS AND DISPOSITION OF DINITROPHENYL-S-GLUTATHIONE IN BILE DUCT-LIGATED RATS

Silvina S. M. Villanueva, María L. Ruiz, Carol J. Soroka, Shi-Ying Cai, Marcelo G. Luquita, Adriana M. Torres, Enrique J. Sánchez Pozzi, José M. Pellegrino, James L. Boyer, Viviana A. Catania and Aldo D. Mottino
Drug Metabolism and Disposition August 1, 2006, 34 (8) 1301-1309; DOI: https://doi.org/10.1124/dmd.106.009415
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