Cycloolivil

Blood Cell. Mol. Dis., 2009, 42(3):279-85.

Olive tree wood phenolic compounds with human platelet antiaggregant properties.[Pubmed: 19195914]

Oleuropein and (+)-Cycloolivil are natural polyphenolic compounds with a significant radical scavenging activity present in olive tree. We have investigated the antiaggregant effects of oleuropein and (+)-Cycloolivil isolated from an ethyl acetate extract of olive tree wood.
METHODS AND RESULTS:
Oleuropein and (+)-Cycloolivil reduced the ability of thrombin to stimulate platelet aggregation. Both compounds reduced thrombin-evoked Ca(2+) release and entry to a similar extent to hydroxytyrosol. This effect was greater in platelets from patients with type 2 diabetes mellitus than in controls. Thrombin-, thapsigargin- and 2,5-di-(tert-butyl)-1,4-hydroquinone (TBHQ)-evoked protein tyrosine phosphorylation, which is involved in Ca(2+) signalling and platelet aggregation, is inhibited by oleuropein and (+)-Cycloolivil. oleuropein and (+)-Cycloolivil are natural oxygen radical scavengers that reduce thrombin-induced protein tyrosine phosphorylation, Ca(2+) signalling and platelet aggregation.
CONCLUSIONS:
These observations suggest that oleuropein and (+)-Cycloolivil may prevent thrombotic complications associated to platelet hyperaggregability and be the base for the development of antiaggregant therapeutic strategies.