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Hypobaric hypoxia induces oxidative stress in rat brain
Panchanan Maiti1, Shashi B Singh, Alpesh K Sharma
1Applied Physiology Division, Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organization, Ministry of Defence, Government of India, Lucknow Road, Timarpur, Delhi 54, India.
Neurochemistry International
|August 17, 2006
Summary
High altitude exposure causes oxidative stress in the brain, decreasing antioxidant defenses. The hippocampus is more vulnerable to hypoxic stress than the cortex and striatum.
Area of Science:
- Neuroscience
- Environmental Physiology
- Biochemistry
Background:
- High altitude exposure decreases oxygen availability, increasing reactive oxygen and nitrogen species (RONS).
- This oxidative stress damages lipids, proteins, and DNA, while impairing the antioxidant enzyme system, particularly in the brain.
- Brain tissue has a limited antioxidant system, making it highly susceptible to hypoxic stress.
Purpose of the Study:
- To investigate time-dependent and region-specific changes in oxidative stress markers.
- To assess the impact of chronic hypobaric hypoxia on antioxidant defense systems in rat brain regions.
Main Methods:
- Rats were exposed to simulated high altitude (6100 m) for 3 and 7 days.
- Oxidative stress markers (free radicals, nitric oxide, lipid peroxidation, lactate dehydrogenase) were measured.
- Antioxidant defense system components (glutathione, glutathione peroxidase, glutathione reductase, superoxide dismutase, GSH/GSSG ratio) were quantified.
Main Results:
- Oxidative stress significantly increased with duration of exposure, with greater effects at 7 days versus 3 days.
- Levels of free radicals, nitric oxide, lipid peroxidation, and lactate dehydrogenase were elevated across all measured brain regions.
- Key antioxidant markers, including reduced glutathione (GSH), glutathione peroxidase (GPx), glutathione reductase (GR), superoxide dismutase (SOD), and the GSH/GSSG ratio, were significantly decreased.
Conclusions:
- Chronic hypobaric hypoxia induces significant oxidative stress and depletes antioxidant defenses in the rat brain.
- The hippocampus exhibits greater susceptibility to hypoxic-induced oxidative stress compared to the cortex and striatum.
- Hypoxia differentially impacts the antioxidant status across different brain regions, highlighting regional vulnerabilities.
