Journal
JOURNAL OF APPLIED PHYSIOLOGY
Volume 93, Issue 4, Pages 1550-1560Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00007.2002
Keywords
lung edema; apoptosis; lipid peroxidation; breathing pattern; vitamin E delivery
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The aim of this study is to examine the antioxidant and antiapoptotic activity of liposomal alpha-tocopherol (LAT) in anesthetized rats exposed to severe hypoxia. It was shown that intratracheal application of LAT normalized lung phospholipid composition and inhibited lipid peroxidation in lung tissues, which in turn decreased lung edema and damage and improved breathing pattern, oxygen diffusion, and lung gas exchange. LAT also limited the overexpression of genes encoding hypoxia inducible factor-1alpha and both studied forms of phospholipase A(2), and it increased the power of cellular antioxidant and antiapoptotic defense by overexpressing genes encoding Mn- and Cu-Zn-cofactored superoxide dismutases, Bcl-2, and heat shock 70 proteins. The overexpression of studied caspases and their activity were downregulated, which significantly (1.6-2 times) limited apoptosis in lung cells. Finally, all these positive changes decreased mortality during hypoxia from similar to60% in untreated animals to similar to30% in the group of rats treated with LAT. The data obtained indicate that LAT may be useful for the correction of hypoxic lung injury.
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