Antiplatelet effects of Spatholobus suberectus via inhibition of the glycoprotein IIb/IIIa receptor

作者：Lee Beom Joon; Jo In Young; Bu Youngmin; Park Jae Woo; Maeng Sungho; Kang Hee; Jang Woochang; Hwang Deok Sang; Lee Wookyoung; Min Kyoungyoon; Kim Jong In; Yoo Hye Hyun; Lew Jae Hwan^*

来源：Journal of Ethnopharmacology, 2011, 134(2): 460-467.

DOI：10.1016/j.jep.2010.12.039

• Spatholobus suberectus
• Platelet aggregation
• Antiplatelet agent
• Glycoprotein IIb/IIIa
• Thromboxane A(2)

Ethnopharmacological relevance: The vine stem of Spatholobus suberectus is a widely used blood-activating and stasis-dispelling medicine for the treatment of diseases related to blood stasis syndrome in traditional medicine in Korea, Japan, and China.
Aim of the study: To demonstrate the clinical effects of Spatholobus suberectus against blood stasis syndromes using in vitro and in vivo platelet aggregation studies and to investigate its exact mechanisms. Materials and methods: We extracted vine stems of Spatholobus suberectus, using 95% EtOH (SSE) and investigated its antiplatelet activity on platelet aggregation induced by collagen and ADP in human platelet-rich plasma (PRP). For the mechanism study, a glycoprotein IIb/IIIa (GP IIb/IIIa) assay using flow cytometric analysis and a thromboxane A(2) (TXA(2)) assay were performed. In addition, we investigated the effects of SSE in a thromboembolic mouse model.
Results: SSE significantly inhibited ADP- and collagen-induced platelet aggregation in human PRP concentration-dependently without affecting plasma clotting time. It also significantly inhibited fibrinogen binding to the GP IIb/IIIa receptor and partly inhibited the formation of TXA(2). In the in vivo study, oral administration of SSE dose-dependently suppressed the death of thromboembolism model mice induced by intravenous injection of collagen plus epinephrine.
Conclusions: SSE showed antiplatelet activity without anticoagulant effects mainly through the inhibition of fibrinogen binding to the GP IIb/IIIa receptor. Our current results support the clinical usage of SSE in the East Asian region treating atherothrombotic diseases and may represent a new natural source to develop antiplatelet agents.

• 出版日期2011-3-24