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Pulmonary oxygen toxicity in chickens and rabbits
Undersea Biomedical Research
|March 1, 1978
Summary
Chickens exhibit remarkable resistance to oxygen toxicity, even under hyperbaric conditions. This resilience is likely due to their lack of oxidant-sensitive ciliated cells in the bronchi, unlike rabbits.
Area of Science:
- Comparative physiology
- Oxygen toxicity research
- Pulmonary medicine
Background:
- Prolonged exposure to oxygen, especially at elevated pressures, can cause pulmonary damage.
- Cellular mechanisms underlying oxygen toxicity vary across species.
- Oxidative stress is a key factor in oxygen-induced lung injury.
Purpose of the Study:
- To investigate the pulmonary response of chickens to hyperbaric and high-concentration oxygen.
- To compare the effects of oxygen exposure on chickens and rabbits.
- To identify cellular factors contributing to species-specific resistance to oxygen toxicity.
Main Methods:
- Chickens were exposed to hyperbaric oxygen (3-5 ATA) or 100% oxygen at atmospheric pressure.
- Rabbits were also exposed to oxygen, with lung lavage and blood cell analysis performed.
- Measurements included pulmonary pathology, hydrogen peroxide levels, superoxide dismutase activity, and glucose oxidation rates.
Main Results:
- Chickens showed no pulmonary damage despite hydrogen peroxide accumulation.
- Chickens exposed to hyperbaric oxygen exhibited increased superoxide dismutase and glucose oxidation.
- Rabbits showed increased superoxide dismutase in lung lavage and blood cells, but unchanged glucose oxidation.
Conclusions:
- Chickens possess significant resistance to oxygen-induced pulmonary damage.
- The absence of oxidant-sensitive ciliated cells in chicken bronchi likely confers this resistance.
- Differences in airway cellular composition explain species variations in oxygen toxicity.