Replacement of dietary saturated by unsaturated fatty acids: effects of platelet protein kinase C activity, urinary content of 2,3-dinor-TXB2 and in vitro platelet aggregation in healthy man.
The present study was conducted to compare the effects of oleic (OA) and linoleic acids (LA) on platelet function in healthy subjects. After a 4-week period on a diet rich in saturated fatty acids (SAFA), 38 volunteers (20 female, 18 male) had a high OA (18.0 en%) diet or a high LA diet (11.5 en%) for four weeks in a controlled manner. A control group of 13 subjects consumed their habitual diet throughout the study. Replacing the SAFA diet by the OA or LA diet did not affect the membrane-associated activity of platelet protein kinase C (PKC). However, both diets tended to increase the cytosolic activity to a comparable extent. Both the OA and the LA diets increased urinary excretion of 2.3-dinor-TXB2, as compared to the SAFA diet, whereas the urinary excretion of beta-thromboglobulin remained unchanged. As compared to the initial SAFA diet, platelet aggregation to collagen increased after both diets, while ADP induced aggregation showed no diet-induced changes. The results indicate increased platelet activity after both oil diets with no differences between the OA and LA diet and confirm in vitro findings that cis-unsaturated fatty acids have a distinct effect on cytosolic PKC, in particular.
Turpeinen
A M
AM
Department of Applied Chemistry and Microbiology (Nutrition), University of Helsinki, Finland. anu.turpeinen@helsinki.fi
Pajari
A M
AM
Freese
R
R
Sauer
R
R
Mutanen
M
M
D000328:Adult; D001792:Blood Platelets / Q000187:drug effects* / Q000502:physiology; D004042:Dietary Fats, Unsaturated / Q000494:pharmacology*; D005227:Fatty Acids / Q000494:pharmacology*; D005260:Female; D006801:Humans; D019787:Linoleic Acid / Q000494:pharmacology*; D008297:Male; D019301:Oleic Acid / Q000494:pharmacology*; D010974:Platelet Aggregation / Q000187:drug effects*; D011493:Protein Kinase C / Q000378:metabolism*; D013929:Thromboxane B2 / Q000031:analogs & derivatives* / Q000652:urine
D004042:Dietary Fats, Unsaturated; D005227:Fatty Acids; D019301:Oleic Acid; D013929:Thromboxane B2; C028965:2,3-dinor-thromboxane B2; D019787:Linoleic Acid; D011493:Protein Kinase C