Bioassay-guided isolation and identification of anti-platelet-active compounds from the root of Ashitaba (Angelica keiskei Koidz.)

Abstract

Platelet aggregation is fundamental to a wide range of physiological and pathological processes, including the induction of thrombosis and arteriosclerosis. Anti-platelet activity of a crude methanol extract and solvent fractions of Ashitaba roots (Angelica keiskei Koidz.) was evaluated using a turbidimetric method using washed rabbit platelets. We identified the anti-platelet activities of two chalcones, 4-hydroxyderricin and xanthoangelol, isolated from the ethyl acetate-soluble fraction of Ashitaba roots by using a bioassay-guided isolation method. 4-Hydroxyderricin and xanthoangelol effectively inhibited platelet aggregation induced by collagen (IC₅₀ of 41.9 and 35.9 μM, respectively), platelet-activating factor (IC₅₀ of 46.1 and 42.3 μM, respectively) and phorbol 12-myristate 13-acetate (IC₅₀ of 16.5 and 45.9 μM, respectively). These compounds did not inhibit thrombin-induced platelet aggregation (IC₅₀ of>80 μM). The results suggest that the chalcones 4-hydroxyderricin and xanthoangelol may be potent anti-thrombotic components of A. keiskei Koidz.

Keywords::

• Angelica keiskei Koidaz
• Ashitaba
• anti-platelet
• 4-hydroxyderricin
• xanthoangelol

Acknowledgement

This work was supported by the Soonchunhyang University Research Fund.

Notes

^1. These authors contributed equally to this article.