TY - JOUR
T1 - EPA, but not DHA, decreases mean platelet volume in normal subjects
AU - Parka, Yongsoon
AU - Harris, William
N1 - Funding Information:
The authors would like to thank Philip Jones for help with the statistical analysis, and Norberta Schoene for her technical advice. Grants from National Heart, Lung, and Blood Institute (HL-47468) and the Heartland Affiliate of the American Heart Association (postdoctoral fellowship for YP) supported this work.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - The first indication of platelet activation is an increase in mean platelet volume (MPV). n-3 FA are known to inhibit platelet function and to reduce the risk for coronary heart disease. The purpose of this study was to determine the effects of EPA and DHA on MPV. Healthy subjects received olive oil placebo for 4 wk and then were randomly assigned to receive 4 g of ethyl esters of either safflower oil (n = 11), EPA (n = 10), or DHA (n = 12) for 4 wk. At the end of placebo run-in and treatment periods, MPV (fL; mean ± SEM) and platelet count (PLT-CT; 103/μL blood) were measured in the basal state and after ex vivo stimulation with collagen (10 μ/mL), cold (4°C), and heat (37°C). Unlike DHA, EPA lowered MPV as compared with safflower oil (7.2 ± 0.1 vs. 7.5 ± 0.1 fL; P < 0.05) and raised PLT-CT (211 ± 18 vs.192 ± 18 103/μL; P < 0.05) in the fasting state. Collagen and cold significantly increased MPV whereas heat lowered MPV regardless of treatment. All stimuli decreased PLT-CT. EPA significantly increased platelet EPA (0.2 ± 0.1 vs. 3.3 ± 0.4%) and docosapentaenoic acid (DPA; 2.2 ± 0.3 vs. 2.9 ± 0.3%) concentrations, but not DHA. DHA treatment significantly increased DHA (1.4 ± 0.2 vs. 4.1 ± 0.5%) and DPA (2.0 ± 0.4 vs. 3.0 ± 0.4%) concentrations, but not EPA. In conclusion, EPA, but not DHA, reduces platelet activation, an early step in platelet aggregation.
AB - The first indication of platelet activation is an increase in mean platelet volume (MPV). n-3 FA are known to inhibit platelet function and to reduce the risk for coronary heart disease. The purpose of this study was to determine the effects of EPA and DHA on MPV. Healthy subjects received olive oil placebo for 4 wk and then were randomly assigned to receive 4 g of ethyl esters of either safflower oil (n = 11), EPA (n = 10), or DHA (n = 12) for 4 wk. At the end of placebo run-in and treatment periods, MPV (fL; mean ± SEM) and platelet count (PLT-CT; 103/μL blood) were measured in the basal state and after ex vivo stimulation with collagen (10 μ/mL), cold (4°C), and heat (37°C). Unlike DHA, EPA lowered MPV as compared with safflower oil (7.2 ± 0.1 vs. 7.5 ± 0.1 fL; P < 0.05) and raised PLT-CT (211 ± 18 vs.192 ± 18 103/μL; P < 0.05) in the fasting state. Collagen and cold significantly increased MPV whereas heat lowered MPV regardless of treatment. All stimuli decreased PLT-CT. EPA significantly increased platelet EPA (0.2 ± 0.1 vs. 3.3 ± 0.4%) and docosapentaenoic acid (DPA; 2.2 ± 0.3 vs. 2.9 ± 0.3%) concentrations, but not DHA. DHA treatment significantly increased DHA (1.4 ± 0.2 vs. 4.1 ± 0.5%) and DPA (2.0 ± 0.4 vs. 3.0 ± 0.4%) concentrations, but not EPA. In conclusion, EPA, but not DHA, reduces platelet activation, an early step in platelet aggregation.
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U2 - 10.1007/s11745-006-0984-1
DO - 10.1007/s11745-006-0984-1
M3 - Article
C2 - 12530552
AN - SCOPUS:0036819275
SN - 0024-4201
VL - 37
SP - 941
EP - 946
JO - Lipids
JF - Lipids
IS - 10
ER -