Auricularia auricula ("Kikurage" in Japan), a kind of mushrooms, has been taken as an ordinary food in East Asia. In the present study, we examined the inhibitory activity of several extracts from Auricularia auricula on rabbit platelet aggregation. We prepared four extracts of Auricularia auricula; water extract, methanol extract, butanol extract from methanol extract (MeOH-BuOH extract) and water extract from methanol extract (MeOH-water extract). Four extracts inhibited ADP-induced platelet aggregation. Since MeOH-BuOH and MeOH-water extracts showed a potent inhibitory activity, both extracts were used for further analysis. MeOH-BuOH and MeOH-water extracts inhibited ADP- or U46619-induced aggregation in a concentration-dependent manner. MeOH-BuOH extract was much more potent than MeOH-water extract. Since adenosine deaminase eliminated the inhibitory effects of both extracts on ADP- or U46619-induced aggregation, they seemed to contain adenosine that inhibits platelet aggregation. In fact, adenosine inhibited ADP- or U46619-induced aggregation in a concentration-dependent manner, and the content of adenosine in each fraction was almost compatible with the inhibitory activity. Furthermore, CGS15943, an adenosine A2A receptor antagonist, reversed the inhibitory effects of both extracts on ADP- or U46619-induced aggregation. These results suggest that Auricularia auricula has anti-platelet activity, and its constituent adenosine mainly exerts its inhibitory activity.
|出版ステータス||Published - 2004 12 1|
ASJC Scopus subject areas
- Pharmacology, Toxicology and Pharmaceutics(all)