Effect of Cyclooxygenase Inhibition on Brain Cell Membrane Lipid Peroxidation during Hypoxia in Newborn Piglets

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Abstract
To test the hypothesis that indomethacin, an inhibitor of cyclooxygenase, reduces free radical-induced brain cell membrane changes during cerebral hypoxia, we determined levels of brain cell membrane lipid peroxidation products and Na+, K+-ATPase activity as indicators of free radical production and membrane function, respectively, in 29 newborn piglets divided into 4 groups. Eight saline- and 4 indomethacin-treated normoxic animals served as controls; 8 saline-pretreated piglets and 9 piglets pretreated with indomethacin were exposed to hypoxic hypoxia for 60 min. Cerebral hypoxia was documented using 31P-NMR spectroscopy. In saline-pre-treated hypoxic animals Na+, K+-ATPase activity decreased significantly and levels of membrane lipid peroxidation products increased significantly compared to normoxic controls. Indomethacin pretreatment prevented the hypoxia-induced increase in membrane lipid peroxidation products but had no effect on the decrease in Na+, K+-ATPase activity. Thus the apparent reduction in free radical production by indomethacin pretreatment did not prevent the hypoxia-induced change in Na+, K+-ATPase activity.

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