Structural and biochemical changes in rat lungs occurring during exposures to lethal and adaptive doses of oxygen.
The lungs of rats exposed to 100% O2 until death and to 85% O2 for as long as 14 days were studied using morphometric and biochemical techniques. The primary injury leading to death in rats exposed to 100% O2 was injury to the pulmonary capillary endothelium, where 44% of the endothelial cells were destroyed; there was a corresponding decrease in capillary surface area and in capillary lumen volume. Animals exposed to 85% O2 had proliferation and hypertrophy of alveolar Type II epithelial cells. In addition, 41% of the capillary endothelial cells were destroyed, but the endothelial cells that survived 7 days in 85% O2 were hypertrophied, and after this point no further destruction of the pulmonary capillary bed took place. Exposures to 85% O2 led to enhanced activity of the copper-zinc and manganese superoxide dismutases, which might be related to the apparently adaptive structural changes that occurred in the alveolar Type II epithelium and in the capillary endothelial cells.
D000222:Adaptation, Physiological; D000818:Animals; D002196:Capillaries / Q000473:pathology; D004727:Endothelium / Q000473:pathology; D004848:Epithelium / Q000473:pathology; D005110:Extracellular Space / Q000166:cytology; D008168:Lung / Q000098:blood supply / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008297:Male; D010100:Oxygen / Q000506:poisoning*; D011650:Pulmonary Alveoli / Q000473:pathology; D051381:Rats; D013997:Time Factors
D010100:Oxygen