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COMPARATIVE STUDY
IN VITRO
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The antiplatelet activity of Geiji-Bokryung-Hwan, Korean traditional formulation, is mediated through inhibition of phospholipase C and inhibition of TxB(2) synthetase activity.
International Immunopharmacology 2003 July
Geiji-Bokryung-Hwan (GBH), consisting of herbes of Cinnamomi ramulus (Geiji), Poria cocos (Bokryun), Mountan cortex radicis (Mokdanpi), Paeoniae radix (Jakyak), and Persicae semen (Doin), on antiplatelet activity in human platelet suspensions was studied. The mechanism involved in the antiplatelet activity of GBH in human platelet suspensions was investigated. GBH did not significantly affect the thromboxane synthetase activity of aspirin-treated platelet microsomes and GBH (15 and 30 microg/ml) significantly inhibited [3H]arachidonic acid released in collagen-activated platelets but not in unactivated-platelets. Nitric oxide (NO) production in human platelets was measured by a chemiluminesence detection method in this study. GBH did not significantly affect nitrate production in collagen (10 microg/ml)-induced human platelet aggregation. Various concentrations of GBH (0, 5, 10, 15, and 30 microg/ml) dose-dependently inhibited [3H]inositol monophosphate formation stimulated by collagen (10 microg/ml) in [3H]myoinositol-loaded platelets at different incubation times (1, 2, 3, and 5 min). These results indicated that the antiplatelet activity of GBH may possibly be due to the inhibition of phospholipase C (PLC) activity, leading to reduce phosphoinositide breakdown, followed by the inhibition of thromboxane A(2) formation, and then inhibition of [Ca(2+)](i) mobilization of platelet aggregation stimulated by agonists. In conclusion, GBH suppressed PLC in a dose-dependent manner, and may have pharmaceutical applications. These data suggest that GBH extracts merit investigation as a potential anti-atherosclerogenic agent in humans.
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