Abstract
In order to study the response of a poorly differentiated tumor to nutritional manipulation, the Yoshida ascites hepatoma (AH 130) was grown in rats fed an essential fatty acid (EFA)-deficient diet and in rats fed a control diet. Hepatomas, livers, and blood plasma from host rats and normal rats were studied as to the effects of EFA deficiency on the lipid composition. Normal rats fed an EFA-deficient diet showed an increased concentration of triglycerides and cholesteryl esters in the liver and a reduced level of total phospholipids in plasma. Host rats fed the EFA-deficient diet showed a lower concentration of triglycerides in the liver when compared with the host rats fed a control diet. In addition, EFA-deficient host rats had reduced levels of plasma free fatty acids and triglycerides. These latter were markedly high in host rats under normal dietetic conditions. As compared to the livers of either host rats or normal rats fed the control diet, the Yoshida hepatoma cells had a lower content of total phospholipids and free fatty acids as well as a higher level of free cholesterol; they also showed a typical fatty acid pattern in their phospholipids. The main characteristics of this pattern were a high content of oleic and palmitoleic acids and a low level of C20 and C22 polyunsaturated fatty acids. Exposure of Yoshida hepatoma cells to an EFA-deficient environment resulted in a decrease in the concentration of total phospholipids and free fatty acids and in changes in the fatty acid composition similar to those observed in the livers of normal and host rats. These changes suggest that, under the experimental conditions used, the Yoshida hepatoma cells are responsive to EFA deficiency.
Highlights
In order to study the response of a poorly differentiated tumor to nutritional manipulation, the Yoshida ascites hepatoma (AH 130) was grown in rats fed an essential fatty acid (EFA)-deficient diet and in rats fed a control diet
Yoshida hepatoma cells grown in rats fed the control diet contained more water and a lower conceniration of total lipids than livers from normal and host rats fed the same diet
In inoculated EFA-deficient diet (EFA-)deficient rats there was no increase of liver lipids, but the water content increased slightly compared with the host liver from control rats
Summary
The EFA-deficient diet used throughout these experiments contained 60% sucrose, 16%fat-free casein, 4% a-cellulose, 1% choline chloride, vitamins, 4% Wesson salt mixture, and 3% hydrogenated beef fat. Male Wistar rats at twenty-one days of age were separated into two groups and fed, respectively, the EFA-deficient or the control diet (rich in linoleic acid) for seven weeks. Groups of 3-4 rats (fed either the EFA-deficient diet or control diet) that had not been inoculated with Yoshida hepatoma, were processed as the host rats These animals are referred to as “normal rats” and they received the dietetic treatment for the same length of time as the host rats. Fallani, and Tombaccini EFA deficiency and lipids of hepatoma, liver, and plasma 457 double hydrogen flame detector and fitted with 6 t't x 1/8 in stainless steel columns packed with 15%) EGSS-X on 100-200 mesh Gas-Chrorn P (Applied Science Laboratories Inc., State College, Pa.).
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