Abstract
Dysregulation of hepatic iron with aging: implications for heat stress-induced oxidative liver injury
American journal of physiology. Regulatory, integrative and comparative physiology, Vol.294(4), pp.R1165-1174
04/2008
DOI: 10.1152/ajpregu.00719.2007
PMID: 18272664
Abstract
Environmental heat stress is associated with an age-related increase in hepatic oxidative damage and an exaggerated state of oxidative stress. The purpose of this investigation was to evaluate the regulation of hepatic iron after heat stress. A secondary aim was to determine a potential role for iron in heat stress-induced liver injury. Hyperthermia-induced alterations in hepatic iron were evaluated in young (6 mo) and old (24 mo) Fischer 344 rats by exposing them to a two-heat stress protocol. Livers were harvested at several time points after the second heating and assayed for labile and nonheme iron. In the control condition, there was no difference in labile iron between age groups. Both labile iron and storage iron were not altered by hyperthermia in young rats, but both were increased immediately after heating in old rats. To evaluate a role for iron in liver injury, hepatic iron content was manipulated in young and old rats, and then both groups were exposed to heat stress. Iron administration to young rats significantly increased hepatic iron content and ferritin but did not affect markers of lipid peroxidation under control conditions or after heat stress. In old rats, iron chelation with deferoxamine prevented the increase in nonheme iron, labile iron, ferritin, and lipid peroxidation after heat stress. These results suggest that iron may play a role in hepatic injury after hyperthermia. Thus, dysregulation of iron may contribute to the gradual decline in cellular and physiological function that occurs with aging.
Details
- Title: Subtitle
- Dysregulation of hepatic iron with aging: implications for heat stress-induced oxidative liver injury
- Creators
- Steven A Bloomer - Department of Integrative Physiology, The University of Iowa, Iowa City, IA, USAKyle E BrownGarry R BuettnerKevin C Kregel
- Resource Type
- Abstract
- Publication Details
- American journal of physiology. Regulatory, integrative and comparative physiology, Vol.294(4), pp.R1165-1174
- Publisher
- United States
- DOI
- 10.1152/ajpregu.00719.2007
- PMID
- 18272664
- ISSN
- 0363-6119
- eISSN
- 1522-1490
- Grant note
- AG-12350 / NIA NIH HHS
- Language
- English
- Date published
- 04/2008
- Academic Unit
- Gastroenterology and Hepatology; Radiation Oncology; Provost Office Administration; Health and Human Physiology; Internal Medicine
- Record Identifier
- 9984047744602771
Metrics
12 Record Views