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Glycosphingolipids from rabbit aorta, plasma, and red blood cells: effects of high cholesterol-high fat diets on fatty acid distribution and quantity of glycosphingolipids.

Four glycosphingolipids were isolated from rabbit aorta, plasma, and red blood cells. They were identified, by thin-layer chromatography and by quantitative analysis of hexose and fatty acid, as cerebroside, diglycosyl ceramide, triglycosyl ceramide, and globoside. The rabbits had been maintained on a normal diet or on one of three high cholesterol diets for 180 days. The quantities of the glycosphingolipids and their fatty acid distributions were determined, and comparisons were made between the control and experimental animals. Aorta and plasma glycosphingolipids were more affected by the high cholesterol diets than were those from red blood cells. The effects on aorta and plasma glycosphingolipids were similar. The amount of cerebroside was increased in aorta and plasma in all animals in the experimental groups. The amount was also increased in red blood cells in rabbits from two of the experimental groups. The average fatty acid chain length was greater in the lipids from the experimental animals than in those from the control animals for all measured glycosphingolipids from aorta. The average chain length was also greater in cerebrosides from the experimental animals from all three tissues. Probably the most notable differences in the experimental animals were the increased 24:1/24:0 ratios and the increased concentrations of 24:2. These increases occurred in nearly all samples from plasma and aorta, but not in red blood cells. There was also an increase of total unsaturated fatty acids in aorta cerebrosides from the experimental animals. Except for the increase in 24:2, lard generally caused more deviation from normal than did cottonseed oil when the level of cholesterol in the diet was 1%.