Dietary soy containing phytoestrogens does not activate the hemostatic system in postmenopausal women.
The soybean is rich in isoflavone phytoestrogens, which are ligands for estrogen receptors, but it is unknown whether soy/phytoestrogens have similar procoagulant effects to estrogen. In this randomized double-blind trial, 40 healthy postmenopausal women of age 50-75 yr received soy protein isolate (40 g soy protein, 118 mg isoflavones) (n = 19) or casein placebo (n = 21). Plasma markers of coagulation, fibrinolysis, and endothelial dysfunction were measured at baseline and 3 months. The baseline characteristics of the two groups were similar. Compared with casein placebo, soy decreased triglycerides (P < 0.005) and low-density lipoprotein/high-density lipoprotein ratio (P < 0.001) and increased lipoprotein (a) (P < 0.05). Activity of coagulation factor VII (VIIc) decreased similarly in both groups (P < 0.005). Prothrombin fragments 1 + 2 (a marker of thrombin generation) decreased in the soy group (P < 0.005), but the change was not different from the casein group. There was no effect of soy on soluble fibrin (a marker of fibrin production), plasminogen activator inhibitor-1 (a marker of fibrinolytic inhibitory potential), D-dimer (a marker of fibrin turnover), or von Willebrand factor (a marker of endothelial damage). In conclusion, the results of the current study do not support biologically significant estrogenic effects of soy/phytoestrogens on coagulation, fibrinolysis, or endothelial function.
Teede
Helena J
HJ
Cardiology Unit, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, Australia.
Dalais
Fabien S
FS
Kotsopoulos
Dimitra
D
McGrath
Barry P
BP
Malan
Erica
E
Gan
T Eng
TE
Peverill
Roger E
RE
D000368:Aged; D004032:Diet; D005260:Female; D006487:Hemostasis; D006801:Humans; D007529:Isoflavones / Q000652:urine; D008055:Lipids / Q000097:blood; D008875:Middle Aged; D010446:Peptide Fragments / Q000032:analysis; D048789:Phytoestrogens / Q000494:pharmacology*; D017698:Postmenopause / Q000097:blood*; D011498:Protein Precursors / Q000032:analysis; D011516:Prothrombin / Q000032:analysis; D013025:Glycine max; D014841:von Willebrand Factor / Q000032:analysis
D007529:Isoflavones; D008055:Lipids; D010446:Peptide Fragments; D048789:Phytoestrogens; D011498:Protein Precursors; D014841:von Willebrand Factor; C029733:prothrombin fragment 1; C044183:prothrombin fragment 2; D011516:Prothrombin