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Am J Physiol Lung Cell Mol Physiol 259: L506-L512, 1990;
1040-0605/90 $5.00
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AJP - Lung Cellular and Molecular Physiology, Vol 259, Issue 6 506-L512, Copyright © 1990 by American Physiological Society

ARTICLES

Molecular basis for tumor necrosis factor-induced increase in pulmonary superoxide dismutase activities

M. F. Tsan, J. E. White, C. Treanor and J. B. Shaffer
Research Service, Department of Veterans Affairs Medical Center, Albany, New York.

Tracheal insufflation of tumor necrosis factor (TNF) enhances pulmonary antioxidant enzyme activities and protects rats against oxygen toxicity (J. Appl. Physiol. 68: 1211-1219, 1990). We now report that tracheal insufflation of TNF selectively induced pulmonary Mn-superoxide dismutase (SOD) mRNA in normoxia- and hyperoxia-exposed rats, leading to increased amounts of Mn-SOD specific protein and enzyme activity. Tracheal insufflation of TNF had no effect on the levels of pulmonary Cu,Zn-SOD mRNA or specific protein. Hyperoxia alone also selectively induced pulmonary Mn-SOD mRNA. However, the hyperoxia-induced increase in Mn-SOD mRNA was not associated with an increase in Mn-SOD specific protein or enzyme activity. The results suggest that the increased pulmonary Mn-SOD in TNF-insufflated rats may contribute to the TNF-induced protection against oxygen toxicity.


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