Journal article
Heat-induced liver injury in old rats is associated with exaggerated oxidative stress and altered transcription factor activation
The FASEB journal, Vol.17(15), pp.2293-2295
12/2003
DOI: 10.1096/fj.03-0139fje
PMID: 14500545
Abstract
A decline in stress tolerance is a hallmark of aging. For instance, older organisms showed extensive hepatic damage, along with increased morbidity and mortality, after environmental heating. We hypothesized that hyperthermic challenge would produce exaggerated oxidative stress in old animals, leading to increased hepatic injury. After a heat-stress protocol, time-course changes in reactive oxygen species (ROS) levels, oxidative damage markers, glutathione (GSH)/glutathione disulfide (GSSG) ratios, and activation of stress-response transcription factors (AP-1 and NF-kappaB) were measured in young and old rats. A small, transient increase in hepatic oxidative damage, with minimal injury, was observed in young rats. However, old rats showed widespread hepatic injury that was manifested over a 24 h period after heating. This pathology was preceded by elevated steady-state levels of ROS, along with large increases in lipid peroxidation products, prolonged hepatic DNA oxidation damage, aberrant GSH/GSSG profiles, and altered activation patterns for AP-1. These data indicate that young animals have an effective oxidation-reduction buffering system in the liver that provides protection from oxidative damage to intracellular macromolecules under stress conditions. In sharp contrast, an environmental challenge in older animals produces exaggerated oxidative stress and alterations in signal transduction pathways, which can contribute to cellular dysfunction and age-related reductions in stress tolerance.
Details
- Title: Subtitle
- Heat-induced liver injury in old rats is associated with exaggerated oxidative stress and altered transcription factor activation
- Creators
- Hannah J Zhang - Integrative Physiology Laboratory, The University of Iowa, Iowa City, IA 52242, USALinjing XuVictoria J DrakeLitao XieLarry W OberleyKevin C Kregel
- Resource Type
- Journal article
- Publication Details
- The FASEB journal, Vol.17(15), pp.2293-2295
- DOI
- 10.1096/fj.03-0139fje
- PMID
- 14500545
- NLM abbreviation
- FASEB J
- ISSN
- 0892-6638
- eISSN
- 1530-6860
- Publisher
- United States
- Grant note
- DOI: 10.13039/100000002, name: National Institutes of Health, award: AG-12350, AG-14687, HL-61389
- Language
- English
- Date published
- 12/2003
- Academic Unit
- Radiation Oncology; Provost Office Administration; Otolaryngology; Health, Sport, and Human Physiology
- Record Identifier
- 9983980387202771
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