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ToxSci Advance Access published online on April 14, 2004
Toxicological Sciences, doi:10.1093/toxsci/kfh145
Toxicological Sciences © Society of Toxicology 2004; all rights reserved
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Received January 29, 2004; accepted April 2, 2004
© 2004 Toxicological Sciences © Society of Toxicology 2004; all rights reserved.

Systems Evaluation

Gene Expression Profiling of Rat Livers Reveals Indicators of Potential Adverse Effects

Alexandra N. Heinloth 1, Richard D. Irwin 2, Gary A. Boorman 2, Paul Nettesheim 1, Rickie D. Fannin 1, Stella O. Sieber 1, Michael L. Snell 3, Charles J. Tucker 1, Leping Li 4, Gregory S. Travlos 5, Gordon Vansant 6, Pamela E. Blackshear 7, Raymond W. Tennant 1, Michael L. Cunningham 3, and Richard S. Paules 1*

1 National Center for Toxicogenomics, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709, USA
2 Environmental Toxicology Program, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709, USA
3 Laboratory of Pharmacology and Chemistry, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709, USA
4 Biostatistics Branch, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709, USA
5 Laboratory for Experimental Pathology, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709, USA
6 Althea Technologies, Inc., 11040 Roselle Street, San Diego, CA 92121
7 Integrated Laboratory Systems, Inc., P.O. Box 13501, Research Triangle Park, NC 27709

* To whom correspondence should be addressed. E-mail: paules{at}niehs.nih.gov.


  Abstract

This study tested the hypothesis that gene expression profiling can reveal indicators of subtle injury to the liver induced by a low dose of a substance that does not cause overt toxicity as defined by conventional criteria of toxicology (e.g. abnormal clinical chemistry and histopathology). For the purpose of this study we defined this low dose as sub-toxic, i.e. a dose that elicits effects which are below the detection of conventional toxicological parameters. Acetaminophen (APAP) was selected as a model hepatotoxicant because 1) considerable information exists concerning the mechanism of APAP hepatotoxicity that can occur following high doses, 2) intoxication with APAP is the leading cause of emergency room visits involving acute liver failure within the United States and 3) conventional clinical markers have poor predictive value.

Rats treated with a single dose of 0, 50, 150 or 1500 mg/kg APAP were examined at 6, 24 or 48 h after exposure for conventional toxicological parameters and for gene expression alterations. Patterns of gene expression were found which indicated cellular energy loss as a consequence of APAP toxicity. Elements of these patterns were apparent even after exposure to sub-toxic doses. With increasing dose, the magnitude of changes increased and additional members of the same biological pathways were differentially expressed. The energy loss suggested by gene expression changes was confirmed at the 1500 mg/kg dose exposure by measuring ATP levels. Only by ultrastructural examination could any indication of toxicity be identified after exposure to a sub-toxic dose of APAP and that was occasional mitochondrial damage.

In conclusion, this study provides evidence that supports the hypothesis that gene expression profiling may be a sensitive means of identifying indicators of potential adverse effects in the absence of the occurrence of overt toxicity.

Key Words: Toxicogenomics, Mitochondrial Toxicity, Hepatotoxicity, Acetaminophen .


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