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• W2140751449 abstract "Mice bearing the Ehrlich ascites tumor were fed diets rich in either coconut oil or sunflower oil. From 20 to 40% less lipid was present in the ascites tumor fluid when the mice were fed the sunflower oil diet. This was associ- ated with a reduction in the amount of very low density lipoproteins (VLDL) and high density lipoproteins (HDL), the main lipoprotein fractions present in the ascites tumor fluid. The VLDL from the mice fed sunflower oil contained more cholesteryl esters and a lower free to esterified cho- lesterol ratio than those from the mice fed coconut oil. Very little change occurred in the composition of the HDL. All of the lipids contained in both lipoprotein fractions ex- hibited appreciable differences in fatty acid composition. Much more monoenoic and less polyenoic fatty acid were present in the lipids from the mice fed the coconut oil diet, but no appreciable change in saturated fatty acid content occurred. Similar changes in fatty acid composition were observed in the blood plasma of the tumor-bearing mice. There was no qualitative difference in the apolipoprotein patterns of either the ascites fluid VLDL or HDL. Pyrene fluorescence studies indicated that the fluidity of the VLDL was increased when the mice were fed the sunflower oil diets. No difference in HDL fluidity, however, was observed by this technique. These results indicate that the amount, composition, and physical properties of certain of the lipo- proteins contained in the ascites tumor fluid can be modi- fied by changing the composition of the dietary fat fed to mice bearing the Ehrlich ascites tumor. high density lipoprotein (HDL) fraction contains about 75% of the ascites apolipoprotein content and 30% of the lipoprotein lipids (2). Although conclu- sive evidence concerning the origin of the ascites fluid lipoproteins has not as yet been obtained, all of the available data suggest that they are derived from the blood of the tumor-bearing mouse and not from the tumor cells themselves (1, 2). Recent studies indicate that the fatty acid composi- tion of the Ehrlich ascites tumor cell lipids can be modified extensively by feeding the tumor-bearing mice different dietary fats (3, 4). This is associated with a change in the cholesteryl ester content of the cells (5). As part of a continuing study of the inter- action between the ascites lipids and the tumor cells (6), we wished to determine whether these diet-in- duced cellular changes might be associated with sim- ilar changes in the structure and properties of the as- cites fluid lipoproteins. The present results indicate that the amount and lipid composition of certain of the ascites tumor fluid lipoproteins can be altered by changing the composition of the fat fed to the tumor- bearing mice. In the case of the VLDL, these changes are associated with differences in fluidity as estimated" @default.
• W2140751449 created "2016-06-24" @default.
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• W2140751449 date "1978-05-01" @default.
• W2140751449 modified "2023-09-24" @default.
• W2140751449 title "Effects of dietary fat composition on the Ehrlich ascites tumor fluid lipoproteins." @default.
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• W2140751449 doi "https://doi.org/10.1016/s0022-2275(20)40717-5" @default.
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