Cited by 277Pharmacogenetics and Drug MetabolismDrug-Induced Hepatotoxicity and ProtectionMetal-Catalyzed Oxygenation Mechanisms

Induction of Rat Hepatic N-Nitrosodimethylamine Demethylase by Acetone Is Due to Protein Stabilization

Open access
Song, B J, Veech, R L, Park, S S, Gelboin, H V, Gonzalez, F J·1989·Journal of Biological Chemistry

Abstract

The N-nitrosodimethylamine demethylase (P450I-IE1) is induced severalfold in liver by giving rats ethanol, acetone, pyrazole, and other related small molecular weight compounds. This induction is not the result of an increase in IIE1 mRNA, but could be due to either an increase in translation rate or a decrease in protein degradation. To determine the mechanism of induction, we measured IIE1 synthesis and degradation rates in untreated and acetone-treated rats. This was accomplished by immunopurification of radiolabeled IIE1 protein using a specific monoclonal antibody subsequent to in vivo labeling of total cellular protein with either NaH14CO3 or [3H]leucine. We found that in rats fed acetone, the rate of IIE1 synthesis was not changed; however, IIE1 degradation was markedly altered. In untreated rats, IIE1 protein was degraded via a biphasic pathway consisting of both a rapid and slow component with approximate half-lives of 7 and 37 h, respectively. However, in acetone-treated rats, only a monophasic curve with a half-life of 37 h was observed. The abolition of the rapid degradation component of the IIE1 turnover cycle indicates that induction of IIE1 by acetone is primarily due to specific stabilization of IIE1 protein. Since acetone is also metabolized by IIE1, we believe that this may be a substrate-induced enzyme stabilization.

Integrity signals

Registry

Crossref · 10.1016/s0021-9258(18)94103-7

Cites

25 of 25 references verified0 citation errors · 0 not checkable

Statistics

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

Claims the paper makes

We couldn’t retrieve this paper’s full text, 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?

  • Formation of adduct proteins can prolong protein half-lives and accumulate as aggregated proteins; AA adduct formation and ubiquitin conjugation may compete for common lysine residues, so when lysine residues are occupied by reactive acetaldehyde, lipid aldehydes, AGEs, or AA, adducts persist and may aggregate due to lack of free lysine for ubiquitin conjugation and proteolysis.

    “The formation of adduct proteins can prolong protein half-lives and accumulate as aggregated proteins.”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Song, B. J., Veech, R. L., Park, S. S., Gelboin, H. V., & Gonzalez, F. J.
Affiliations
National Institutes of Health (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1989-02
Volume
264
Issue
6
Pages
3568-3572
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1577117187
Cited by
277
References
25
Citations by year
2025: 2 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 4 · 2017: 4 · 2016: 2 · 2015: 4 · 2014: 6 · 2013: 5 · 2012: 9
FWCI
19.95
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
CYP1A1, acetone, enzyme induction, protein stabilization, protein degradation, protein synthesis, enzyme turnover, hepatic cytochrome P450, rat liver
MeSH terms
Acetone, Animals, Autoradiography, Electrophoresis, Polyacrylamide Gel, Enzyme Induction, Kinetics, Leucine, Male, Microsomes, Liver, Oxidoreductases, N-Demethylating, Pyrazoles, Rats, Inbred Strains, Protein Biosynthesis, Cytochrome P-450 CYP2E1, Rats

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