Effects of vitamin E on the platelet aggregation induced by combined adenosine diphosphate and hydrogen peroxide.

Hydrogen peroxide can either induce or inhibit or enhance the platelet aggregation in vitro depending upon the experimental conditions. Vitamin E and vitamin E-nicotinate are found to be effective to inhibit, to some extent, the platelet aggregation induced by combined adenosine diphosphate (ADP) and hydrogen peroxide (H2O2), added simultaneously, to the platelet rich plasma (PRP). Vitamin E and vitamin E-nicotinate seemed, however, to be unable to prevent the reduction of platelet response to ADP, which was brought about by the pretreatment of PRP with H2O2 of a lower concentration.