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Effect of hypobaric hypoxia on immune function in albino rats
M SaiRam1, S K Sharma, P Dipti
1Defence Institute of Physiology and Allied Sciences, Delhi, India.
International Journal of Biometeorology
|October 22, 1998
Summary
Hypoxia, a state of low oxygen, boosts macrophage activity but impairs T-cell function. This study suggests hypoxia causes oxidative stress, impacting immune responses.
Area of Science:
- Immunology
- Physiology
- Oxidative Stress Research
Background:
- Hypoxia (low oxygen) is a condition affecting various physiological processes.
- Immune cell function, particularly macrophages and lymphocytes, may be sensitive to oxygen levels.
- Oxidative stress is implicated in numerous disease states and cellular dysfunctions.
Purpose of the Study:
- To investigate the impact of hypoxia on macrophage activity.
- To assess the effect of hypoxia on lymphocyte function, specifically T-cell responses.
- To determine if hypoxia induces oxidative stress in the investigated model.
Main Methods:
- Exposure of subjects to hypoxic conditions.
- Measurement of peritoneal macrophage phagocytosis and free radical production.
- Assessment of T-cell activity via delayed-type hypersensitivity response.
- Quantification of blood glutathione (reduced) and plasma malondialdehyde levels.
Main Results:
- Hypoxia significantly enhanced peritoneal macrophage activity, including phagocytosis and free radical production.
- A considerable reduction in the delayed-type hypersensitivity response was observed, indicating impaired T-cell activity.
- Blood glutathione levels decreased, while plasma malondialdehyde levels approximately doubled, suggesting oxidative stress.
Conclusions:
- Hypoxia enhances innate immune cell (macrophage) activity.
- Hypoxia impairs adaptive immune cell (T-cell) function.
- The findings suggest that hypoxia-induced oxidative stress contributes to decreased T-cell activity.