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Research ArticleArticle

Induction of Hepatobiliary Efflux Transporters in Acetaminophen-Induced Acute Liver Failure Cases

Sarah N. Barnes, Lauren M. Aleksunes, Lisa Augustine, George L. Scheffer, Michael J. Goedken, Amy B. Jakowski, Ingrid M. Pruimboom-Brees, Nathan J. Cherrington and José E. Manautou
Drug Metabolism and Disposition October 2007, 35 (10) 1963-1969; DOI: https://doi.org/10.1124/dmd.107.016170
Sarah N. Barnes
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Lauren M. Aleksunes
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Lisa Augustine
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George L. Scheffer
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Michael J. Goedken
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Amy B. Jakowski
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Ingrid M. Pruimboom-Brees
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Nathan J. Cherrington
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José E. Manautou
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Abstract

Alterations in transporter expression may represent a compensatory mechanism of damaged hepatocytes to reduce accumulation of potentially toxic compounds. The present study was conducted to investigate the expression of hepatobiliary efflux transporters in livers from patients after toxic acetaminophen (APAP) ingestion, with livers from patients with primary biliary cirrhosis (PBC) serving as positive controls. mRNA and protein expression of multidrug resistance-associated protein (MRP) 1-6, multidrug resistance protein (MDR) 1-3/P-glycoprotein (P-gp), and breast cancer resistance protein (BCRP) in normal (n = 6), APAP overdose (n = 5), and PBC (n = 6) human liver samples were determined by branched DNA and Western blot analysis, respectively. Double immunohistochemical staining of P-gp and proliferating cell nuclear antigen (PCNA), a marker of proliferation, was performed on paraffin-embedded tissue sections. Compared with normal liver specimens, MRP1 and MRP4 mRNA levels were elevated after APAP overdose and in PBC. Up-regulation of MRP5, MDR1, and BCRP mRNA occurred in PBC livers. Protein levels of MRP4, MRP5, BCRP, and P-gp were increased in both disease states, with MRP1 and MRP3 protein also being induced in PBC. Increased P-gp protein was confirmed immunohistochemically and was found to localize to areas of PCNA-positive hepatocytes, which were detected in APAP overdose and PBC livers. The findings from this study demonstrate that hepatic efflux transporter expression is up-regulated in cases of APAP-induced liver failure and PBC. This adaptation may aid in reducing retention of byproducts of cellular injury and bile constituents within hepatocytes. The close proximity of P-gp and PCNA-positive hepatocytes during liver injury suggests that along with cell regeneration, increased efflux transporter expression is a critical response to hepatic damage to protect the liver from additional insult.

Footnotes

  • This work was supported in part by Pfizer Global Research and Development and by National Institutes of Health Grants DK069557 (J.E.M.) and DK068039 (N.J.C.). L.M.A. is a Howard Hughes Medical Institute Predoctoral Fellow and S.N.B. is a PhRMA Foundation Predoctoral Fellow. Human liver specimens were obtained from the Liver Tissue Procurement and Distribution System at the University of Minnesota, which is funded by National Institutes of Health Contract N01-DK-9-2310.

  • S.N.B. and L.M.A. contributed equally to this work.

  • Portions of this work were presented at the 2006 Annual Meeting of the Society of Toxicology (Barnes et al., 2006a), and at the 14th North American ISSX Meeting (Barnes et al., 2006b).

  • doi:10.1124/dmd.107.016170.

  • ABBREVIATIONS: APAP, acetaminophen; MRP (Mrp), multidrug resistance-associated protein; PBC, primary biliary cirrhosis; bDNA, branched DNA; MDR, multidrug resistance protein; BCRP, breast cancer resistance protein; BSEP, bile salt export pump; P-gp, P-glycoprotein; PCNA, proliferating cell nuclear antigen.

    • Received April 5, 2007.
    • Accepted July 9, 2007.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 35 (10)
Drug Metabolism and Disposition
Vol. 35, Issue 10
1 Oct 2007
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Research ArticleArticle

Induction of Hepatobiliary Efflux Transporters in Acetaminophen-Induced Acute Liver Failure Cases

Sarah N. Barnes, Lauren M. Aleksunes, Lisa Augustine, George L. Scheffer, Michael J. Goedken, Amy B. Jakowski, Ingrid M. Pruimboom-Brees, Nathan J. Cherrington and José E. Manautou
Drug Metabolism and Disposition October 1, 2007, 35 (10) 1963-1969; DOI: https://doi.org/10.1124/dmd.107.016170

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Research ArticleArticle

Induction of Hepatobiliary Efflux Transporters in Acetaminophen-Induced Acute Liver Failure Cases

Sarah N. Barnes, Lauren M. Aleksunes, Lisa Augustine, George L. Scheffer, Michael J. Goedken, Amy B. Jakowski, Ingrid M. Pruimboom-Brees, Nathan J. Cherrington and José E. Manautou
Drug Metabolism and Disposition October 1, 2007, 35 (10) 1963-1969; DOI: https://doi.org/10.1124/dmd.107.016170
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