title: The effects of polyunsaturated:saturated fatty acids ratios and peroxidisability index values of dietary fats on serum lipid profiles and hepatic enzyme activities in rats.
abstract: Raising the dietary PUFA:saturated fatty acids (SFA) ratio has been recommended for the prevention of CVD. However, a high PUFA:SFA (P:S) ratio diet enhances oxidative stress because PUFA are highly susceptible to lipid peroxidation. Thus, we focused on the role of the dietary P:S ratio and peroxidisability index (PI) value on serum and liver tissue and investigated the effects of dietary P:S ratios (0.4, 1.0, and 4.8) with a fixed PI value (81) on serum lipid parameters and hepatic enzyme activities (experiment 1). To elucidate whether those phenomena were unique to the P:S ratio, we examined the effects of dietary PI values (36, 81, 126, and 217) with a constant P:S ratio (1.0) (experiment 2). Female Sprague-Dawley rats weighing 240-280 g were fed experimental diets for 4 weeks. When dietary PI value was maintained at 81, serum HDL-cholesterol (HDL-C) increased with increasing dietary P:S ratio. When the P:S ratio was fixed at 1.0, HDL-C was the lowest with mid-low PI (MLPI) (PI value of 81). In both experiments, serum LDL-cholesterol:HDL-C ratio kept in the range of 0-2. The hepatic superoxide dismutase, catalase, and glutathione peroxidase (GSH-Px) activities and thiobarbituric acid reactive substance (TBARS) concentrations were the highest in the lowest dietary P:S ratio group (experiment 1). GSH-Px, glutathione-S-transferase, and TBARS were the lowest in rats fed the MLPI diet (experiment 2). In conclusion, these results indicate that a P:S ratio of 1.0-1.5 and a PI value of 80-90 in the diet are within a favourable range to reduce the risk of CVD.
authors.affiliation: Department of Food and Nutrition, Hanyang University, Seoul 133-791, South Korea.
authors.forename: Min Jeong
authors.initials: MJ
authors.lastname: Kang
authors.forename: Myoung Suk
authors.initials: MS
authors.lastname: Shin
authors.forename: Jung Nan
authors.initials: JN
authors.lastname: Park
authors.forename: Sang Sun
authors.initials: SS
authors.lastname: Lee
mesh_terms: D000818:Animals; D002374:Catalase / Q000378:metabolism; D008076:Cholesterol, HDL / Q000097:blood; D004041:Dietary Fats / Q000494:pharmacology*; D005227:Fatty Acids / Q000494:pharmacology; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology; D005260:Female; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation; D008055:Lipids / Q000097:blood*; D008099:Liver / Q000201:enzymology; D008111:Liver Function Tests; D010743:Phospholipids / Q000097:blood; D051381:Rats; D017207:Rats, Sprague-Dawley; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014280:Triglycerides / Q000097:blood
chemical_list: D008076:Cholesterol, HDL; D004041:Dietary Fats; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D008055:Lipids; D010743:Phospholipids; D017392:Thiobarbituric Acid Reactive Substances; D014280:Triglycerides; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase