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Decreased oxidative metabolism in neonatal rat lung exposed to hyperoxia

Decreased oxidative metabolism in neonatal rat lung exposed to hyperoxia

Journal of Applied Physiology: Respiratory Environmental and Exercise Physiology 55(5): 1501-1505

The effect of exposure to high O2 concentration on neonatal rat lung oxidative function was determined. The water content of lungs from neonatal rats exposed to 100% O2 for the first 6 days of life was 3% greater than room-air control, indicating minimal pulmonary edema. Since neonatal rat lungs exposed to O2 have minimal pulmonary edema, they provide a model to determine the direct effect of O2 on mitochondrial oxidative function. After 6 days of exposure to 100% O2, lactate production by lung slices of neonatal rats was twofold greater than room-air controls. Lactate production by lung slices of neonatal rats exposed to six days of O2 and then 3 days of room air was equal to controls. Total pyruvate dehydrogenase activity was 45% lower in O2-exposed lung compared with control, and active pyruvate dehydrogenase activity was 20% lower. The oxidation of lauric acid, acetate, and beta-hydroxybutyrate was 40% lower in the O2-exposed lung compared with controls. These data suggest that there is a toxic effect of O2 on mitochondrial oxidative function in the absence of severe pulmonary edema and that these toxic effects are reversible within 72 h.

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Accession: 042741245

Download citation: RISBibTeXText

PMID: 6643186

DOI: 10.1152/jappl.1983.55.5.1501

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