Abstract
Rabbits fed an atherogenic diet for 60 days resulted in high levels of plasma lipid peroxides as well as extreme hypercholesterolemia. Both levels stayed high until 35 days after the atherogenic diet stopped. At the same time, plasma PGI 2 level was remarkably decreased while TXA 2 and platelet aggregability were increased. Atherosclerotic aortas contain high levels of lipid peroxides associated with decreased PGI 2 and increased TXA 2 generation. Atherosclerotic plaques had the highest level of lipid peroxides and TXA 2 while PGI 2 production was the least, as compared with nonplaque tissue of the same artery and the normal arteries. The condition of normal arteries was just the reverse. There was a negative correlation between lipid peroxides and prostacyclin production, and a positive correlation between lipid peroxides and TXA 2, in both plasma and aorta of rabbits. These results suggest that there is a close correlation between atherosclerosis, elevated lipid peroxides, and disturbances in PGI 2 TXA 2 balances.
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