protection by vitamin E against endothelial cell injury by linoleic acid hydroperoxides

Exposure to 90 μM albumin-bound linoleic acid (18:2) for 24 hours significantly increased the rate of albumin transfer across cultured endothelial monolayers. Linoleic acid hydroperoxides (18:2-OOH) further accelerated the rate of albumin transfer over that of 18:2. Cells exposed to 18:2-OOH but not 18:2 caused a marked release of lactate dehydrogenase (LDH) into the media. Prior cellular incubation with media containing 25 μM vitamin E for 24 hours protected endothelial cells from injury by 18:2 and 18:2-OOH, as evidenced by a decreased rate of albumin transfer across the endothelium as well as reduced release of LDH into the media. These results suggest that vitamin E may provide protection against endothelial cell injury resulting from expusure to fatty acid hydroperoxides