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Inhibition of Rat Platelet Aggregation by Urtica dioica Leaves Extracts
Author(s) -
El Haouari Mohammed,
Bnouham Mohamed,
Bendahou Mourad,
Aziz Mohammed,
Ziyyat Abderrahim,
Legssyer Abdelkhaleq,
Mekhfi Hassane
Publication year - 2006
Publication title -
phytotherapy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 129
eISSN - 1099-1573
pISSN - 0951-418X
DOI - 10.1002/ptr.1906
Subject(s) - urtica dioica , thrombin , platelet , chemistry , pharmacognosy , ethyl acetate , epinephrine , in vitro , pharmacology , biochemistry , biological activity , traditional medicine , botany , biology , medicine , endocrinology
Abstract Platelet hyperactivity plays an important role in arterial thrombosis and atherosclerosis. The present study was undertaken to investigate the effects of different extracts of Urtica dioica leaves on platelet aggregation. Rat platelets were prepared and incubated in vitro with different concentrations of the tested extracts and aggregation was induced by different agonists including thrombin (0.5 U/mL), ADP (10 µ m ), epinephrine (100 µ m ) and collagen (5 mg/mL). The crude aqueous extract inhibited thrombin‐induced platelet aggregation in a dose‐dependent manner. At 1 mg/mL, the percent inhibition was 17.1 ± 4.2%. Soxhlet extraction of the plant leaves with different successive solvents showed that the ethyl acetate extract exhibited the most antiaggregant effect with an inhibition of 76.8 ± 6.1% at 1 mg/mL. Flavonoids isolated from the plant leaves, produced a strong inhibitory effect on thrombin‐induced platelet aggregation with an IC 50 of 0.25 ± 0.05 and 0.40 ± 0.04 mg/mL for genins and heterosidic flavonoids, respectively. Flavonoids also markedly inhibited platelet aggregation induced by ADP, collagen and epinephrine. It is concluded that Urtica dioica has an antiplatelet action in which flavonoids are mainly implicated. These results support the traditional use of Urtica dioica in the treatment and/or prevention of cardiovascular disease. Copyright © 2006 John Wiley & Sons, Ltd.