Effect of dietary fish oil on tumor-induced hyperlipidemia and tumor growth in rats implanted with a methylcholanthrene-induced sarcoma.
Male Fischer 344 rats implanted with a methylcholanthrene-induced sarcoma (MCS), along with normal (or control) animals, were fed diets containing either 10% com oil (CO) or 2% CO + 8% fish oil (FO), designated as diets CO and FO, respectively, in a study designed to determine the effect of dietary FO on serum lipids (in the presence or absence of a tumor) and the growth and fatty acid composition of the MCS. For both diets, MCS-bearing rats had significantly (p < 0.05) higher serum levels of triglycerides, cholesterol, phospholipids, and total lipids than controls. For both controls and tumor-bearers, serum levels of all these lipids were, with the exception of cholesterol for the tumorbearers, significantly lower in rats receiving the FO diet than for the corresponding groups receiving the CO diet. Relative to rats fed the CO diet, those fed the FO diet had significantly higher serum levels of some fatty acids (e.g., 20:5n-3) but significantly lower levels of others (e.g., 18:2n-6), regardless of tumor status. For the tumor-bearers, differences in the levels of fatty acids in MCS tissue reflected differences in the fatty acid composition of total serum lipids. Sarcoma growth was unaffected by diet. Thus, feeding dietary FO resulted in changes in the lipid status of both control and tumor-bearing rats. Since sarcoma growth was unaffected by diet, the reduction in the severity of MCS-induced hyperlipidemia by FO appears to be due to an effect of the oil per se.
Radcliffe
J
J
Department of Nutrition and Food Sciences, Texas Woman's University, Houston 77030, USA.
Czajka Narins
D
D
Imrhan
V
V
Edwards
M
M
D000818:Animals; D001835:Body Weight; D003314:Corn Oil / Q000378:metabolism; D004041:Dietary Fats / Q000494:pharmacology*; D004435:Eating; D005227:Fatty Acids / Q000097:blood; D005395:Fish Oils / Q000494:pharmacology*; D006949:Hyperlipidemias / Q000150:complications*; D008055:Lipids / Q000097:blood; D008297:Male; D008748:Methylcholanthrene; D009368:Neoplasm Transplantation; D051381:Rats; D011916:Rats, Inbred F344; D012513:Sarcoma, Experimental / Q000139:chemically induced / Q000150:complications* / Q000473:pathology
D004041:Dietary Fats; D005227:Fatty Acids; D005395:Fish Oils; D008055:Lipids; D008748:Methylcholanthrene; D003314:Corn Oil