Hepatoma, host liver, and normal rat liver phospholipids as affected by diet
- Randall Wood
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Individual phospholipid classes derived from hepatoma, host liver, and normal liver of rats maintained on chow and fat free diets were examined in detail and the sphingomyelin and phosphoglyceride structures compared. The concentration of hepatoma sphingomyelin was higher while phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylserine, and diphosphatidylglycerol were only one-fourth to one-half normal liver concentrations, irrespective of diet. Hepatoma phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol contained higher percentages of 18∶1 and, except phosphatidylinositol, much lower percentages of most polyunsaturated fatty acids than liver. The 1-position of host liver phosphatidylcholine and phosphatidylethanolamine, normal liver phosphatidylcholine and phosphatidylethanolamine, and hepatoma phosphatidylcholine from animals on both diets had the same approximate fatty acid composition, but the percentage of 16∶0 in hepatoma phosphatidylethanolamine was reduced dramatically. The low percentage of 16∶0 at the 1-position of both phosphatidylethanolamine and triglycerides suggests that the 1-position fatty acids of these two classes may have a similar origin. The fat free diet reduced the percentage of 18∶2 in liver diphosphatidylglycerol 3-fold and the decrease was offset by increased percentages of 16∶1 and 18∶1; whereas the very low percentage of 18∶2 in hepatoma diphosphatidylglycerol was offset by increased percentages of 18∶0 and 16∶0. Liver phosphatidylinositol and phosphatidylcholine from the animals fed the fat free diet contained the highest percentage of 20∶3, which replaced 20∶4. Hepatoma sphingomyelin contained a much higher concentration of 24∶0 and 24∶1 than liver. The hepatoma sphingomyelin also contained a C-24 dienoic acid, which was not detected in host and normal liver. Host liver contained a higher percentage of 22∶6 than normal liver. The diglycerides derived from host liver PC contained a significantly higher percentage of carbon number 38 than normal liver. Diglycerides derived from hepatoma phosphatidylcholine and phosphatidylethanolamine exhibited a 1-random-2-random distribution of fatty acids, whereas diglycerides from liver phosphatidylcholine and phosphatidylethanolamine showed pairing of specific fatty acids.
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- Hepatoma, host liver, and normal rat liver phospholipids as affected by diet
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- 1. Division of Gastroenterology, Departments of Medicine and Biochemistry, University of Missouri School of Medicine, 65201, Columbia, Missouri