Cited by 728Drug-Induced Hepatotoxicity and ProtectionGenomics, phytochemicals, and oxidative stressPharmacogenetics and Drug Metabolism

High Sensitivity of Nrf2 Knockout Mice to Acetaminophen Hepatotoxicity Associated with Decreased Expression of ARE-Regulated Drug Metabolizing Enzymes and Antioxidant Genes

Enomoto, A.·2001·Toxicological Sciences

Abstract

Nrf2, which belongs to the basic leucine zipper (bZip) transcription factor family, has been implicated as a key molecule involved in antioxidant-responsive element (ARE)-mediated gene expression. In order to examine the role of Nrf2 in protection against xenobiotic toxicity, the sensitivity of nrf2 knockout mice to acetaminophen (N-acetyl-4-aminophenol (APAP)) was analyzed. The saturation of detoxification pathways after high levels of exposure to APAP is known to induce hepatotoxicity. Two factors important in its detoxification are UDP-glucuronosyltransferase (UDP-GT), an ARE-regulated phase-II drug-metabolizing enzyme, and glutathione (GSH), an antioxidant molecule whose synthesis depends on ARE-regulated gamma-glutamylcysteine synthetase (gammaGCS). Two- to 4-month-old male mice were orally administered a single dose of APAP at 0, 150, 300, or 600 mg/kg. Doses of 300 mg/kg APAP or greater caused death in the homozygous knockout mice only, and those that survived showed a greater severity in hepatic damage than the wild-type mice, as demonstrated by increased plasma alanine aminotransferase activity, decreased hepatic non-protein sulfhydryl (NPSH) content, and centrilobular hepatocellular necrosis. The high sensitivity of Nrf2-deficient mice was confirmed from observations made at 0, 2, 8, and 24 h after dosing with 300 mg/kg APAP; increased anti-APAP immunoreactivity was also noted in their livers at 2 h. Untreated homozygous knockout mice showed both a lower UDP-GT activity and NPSH content, which corresponded to decreased mRNA levels of UDP-GT (Ugt1a6) and the heavy chain of gammaGCS, respectively. These results show that Nrf2 plays a protective role against APAP hepatotoxicity by regulating both drug metabolizing enzymes and antioxidant genes through the ARE.

Integrity signals

Registry

Crossref · 10.1093/toxsci/59.1.169

Cites

42 of 42 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Enomoto, A.
Affiliations
The Institute of Environmental Toxicology (JP)
Corresponding author
Enomoto, A.
Venue
Toxicological Sciences
Published
2001-01-01
Volume
59
Issue
1
Pages
169-177
ISSN
1096-0929 (ISSN-L)
OpenAlex
W2003867270
Cited by
728
References
42
Citations by year
2026: 5 · 2025: 11 · 2024: 15 · 2023: 23 · 2022: 34 · 2021: 20 · 2020: 35 · 2019: 24 · 2018: 36 · 2017: 33 · 2016: 38 · 2015: 37 · 2014: 40 · 2013: 48 · 2012: 41
FWCI
22.39
Type
journal article
Language
en
Open access
closed
Locations
  • Toxicological Sciences (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
Keywords
Nrf2, acetaminophen hepatotoxicity, antioxidant response element, UDP-glucuronosyltransferase, gamma-glutamylcysteine synthetase, glutathione, drug-metabolizing enzymes, antioxidant genes, xenobiotic detoxification, liver necrosis, non-protein sulfhydryl groups, Nrf2 knockout mice, phase II metabolism
MeSH terms
Acetaminophen, Alanine Transaminase, Animals, DNA-Binding Proteins, Dose-Response Relationship, Drug, Glutamate-Cysteine Ligase, Glutathione, Heterozygote, Homozygote, Male, Mice, Inbred ICR, Microsomes, Liver, RNA, Messenger, Glucuronosyltransferase, Trans-Activators, Gene Expression Regulation, Enzymologic, Mice, Knockout, Fluorescent Antibody Technique, Indirect, Reverse Transcriptase Polymerase Chain Reaction, NF-E2-Related Factor 2, Mice, Chemical and Drug Induced Liver Injury

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review