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pubmed-article:10839317pubmed:abstractTextPrevious studies demonstrated that elevation of hepatic glutathione (GSH) concentrations protect against acetaminophen (APAP) hepatotoxicity in mice. Employing transgenic mice overexpressing glutathione synthetase, this study was conducted to determine if sustained elevation of hepatic GSH concentrations could ameliorate or prevent APAP toxicity. International Cancer Research transgenic mouse males and matched (ie same strain, sex, and age) control nontransgenic mice were pretreated ip with GSH synthetase substrate gamma-glutamylcysteinyl ethyl ester (gamma-GCE) or with saline. After a 16-h fast, mice received a single dose of 500 mg APAP/kg bw in saline ip and were sacrificed 4 h later. Other mice similarly pretreated were killed without APAP challenge. The elevated GSH concentrations in transgenic mice livers did not lessen APAP hepatotoxicity. Instead higher degrees of hepatotoxicity and nephrotoxicity were observed in transgenic mice than in controls as indicated by higher serum alanine aminotransferase activity and more severe histopathological lesions in transgenic mice livers and kidneys. Pretreatment with gamma-GCE did not affect either initial or post-APAP treatment tissue GSH concentrations or observed degrees of toxicity. Detection of a higher level of serum APAP in transgenic mice and the histopathological lesions found in transgenic mice kidneys together with no observable nephrotoxicity in control mice indicated early kidney damage in transgenic mice. Our findings suggest that high levels of GSH-APAP conjugates resulting from increased GSH concentrations in the livers of transgenic mice caused rapid kidney damage. Compromised excretory ability may have caused retention of APAP, which, in effect, elicited higher hepatotoxicity than that observed in nontransgenic mice.lld:pubmed
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pubmed-article:10839317pubmed:pagination146-50lld:pubmed
pubmed-article:10839317pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:10839317pubmed:articleTitleAcute acetaminophen toxicity in transgenic mice with elevated hepatic glutathione.lld:pubmed
pubmed-article:10839317pubmed:affiliationDepartment of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens 30602, USA.lld:pubmed
pubmed-article:10839317pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10839317pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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