Cited by 85Redox biology and oxidative stressAlcohol Consumption and Health EffectsMitochondrial Function and Pathology

Oxidative modification of hepatic mitochondria protein thiols: effect of chronic alcohol consumption

Venkatraman, Aparna, Landar, Aimee, Davis, Ashley J., Ulasova, Elena, Page, Grier, Murphy, Michael P., Darley-Usmar, Victor, Bailey, Shannon M.·2004·American Journal of Physiology-Gastrointestinal and Liver Physiology

Abstract

Redox modification of mitochondrial proteins is thought to play a key role in regulating cellular function, although direct evidence to support this hypothesis is limited. Using an in vivo model of mitochondrial redox stress, ethanol hepatotoxicity, the modification of mitochondrial protein thiols was examined using a proteomics approach. Specific labeling of reduced thiols in the mitochondrion from the livers of control and ethanol-fed rats was achieved by using the thiol reactive compound (4-iodobutyl)triphenylphosphonium (IBTP). This molecule selectively accumulates in the organelle and can be used to identify thiol-containing proteins. Mitochondrial proteins that have been modified are identified by decreased labeling with IBTP using two-dimensional SDS-PAGE followed by immunoblotting with an antibody directed against the triphenylphosphonium moiety of the IBTP molecule. Analyses of these data showed a significant decrease in IBTP labeling of thiols present in specific mitochondria matrix proteins from ethanol-fed rats compared with their corresponding controls. These proteins were identified as the low-K(m) aldehyde dehydrogenase and glucose-regulated protein 78. The decrease in IBTP labeling in aldehyde dehydrogenase was accompanied by a decrease in specific activity of the enzyme. These data demonstrate that mitochondrial protein thiol modification is associated with chronic alcohol intake and might contribute to the pathophysiology associated with hepatic injury. Taken together, we have developed a protocol to chemically tag and select thiol-modified proteins that will greatly enhance efforts to establish posttranslational redox modification of mitochondrial protein in in vivo models of oxidative or nitrosative stress.

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Crossref · 10.1152/ajpgi.00399.2003

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Authors
Venkatraman, A., Landar, A., Davis, A. J., Ulasova, E., Page, G., Murphy, M. P., Darley-Usmar, V., & Bailey, S. M.
Affiliations
University of Alabama at Birmingham (US)
Venue
American Journal of Physiology-Gastrointestinal and Liver Physiology
Published
2004-04
Volume
286
Issue
4
Pages
G521-G527
ISSN
  • 0193-1857 (ISSN-L)
  • 1522-1547
OpenAlex
W2131656539
Cited by
85
References
32
Citations by year
2026: 1 · 2025: 1 · 2023: 3 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 5 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 4 · 2013: 3 · 2012: 3
FWCI
2.00
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Gastrointestinal and Liver Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r21aa013682-03)
  • National Institute on Alcohol Abuse and Alcoholism (AA13682, R01AA013395, AA-13395)
  • National Cancer Institute (P30CA013148)
  • National Center for Research Resources (S10RR011329)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Alcohol Consumption and Health Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
redox modification, chronic alcohol consumption, ethanol-induced hepatotoxicity, oxidative stress, mitochondrial matrix proteins, aldehyde dehydrogenase, GRP78, thiol labeling, liver injury
MeSH terms
Ethanol, Aldehyde Dehydrogenase, Animals, Central Nervous System Depressants, Chronic Disease, Electrophoresis, Polyacrylamide Gel, Energy Metabolism, Image Processing, Computer-Assisted, Male, Mitochondria, Liver, Molecular Weight, Oxidation-Reduction, Proteins, Sulfhydryl Compounds, Immunoblotting, Rats, Sprague-Dawley, Reactive Oxygen Species, Reactive Nitrogen Species, Rats, In Vitro Techniques

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