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Inhibitory effects of total saponin from Korean red ginseng via vasodilator-stimulated phosphoprotein-Ser157 phosphorylation on thrombin-induced platelet aggregation

  • Lee, Dong-Ha (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering and Regional Research Center, Inje University) ;
  • Cho, Hyun-Jeong (Department of Biomedical Laboratory Science, College of Medical Science, Konyang University) ;
  • Kim, Hyun-Hong (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering and Regional Research Center, Inje University) ;
  • Rhee, Man Hee (Laboratory of Veterinary Physiology & Signaling, College of Veterinary Medicine, Kyungpook National University) ;
  • Ryu, Jin-Hyeob (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering and Regional Research Center, Inje University) ;
  • Park, Hwa-Jin (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering and Regional Research Center, Inje University)
  • Received : 2012.09.04
  • Accepted : 2012.12.05
  • Published : 2013.04.15

Abstract

In this study, we have investigated the effects of total saponin from Korean red ginseng (TSKRG) on thrombin-induced platelet aggregation. TSKRG dose-dependently inhibited thrombin-induced platelet aggregation with $IC_{50}$ value of about 81.1 ${\mu}g/mL$. In addition, TSKRG dose-dependently decreased thrombin-elevated the level of cytosolic-free $Ca^{2+}$ ($[Ca^{2+}]_i$), one of aggregation-inducing molecules. Of two $Ca^{2+}$-antagonistic cyclic nucleotides as aggregation-inhibiting molecules, cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP), TSKRG significantly dose-dependently elevated intracellular level of cAMP, but not cGMP. In addition, TSKRG dose-dependently inhibited thrombin-elevated adenosine triphosphate (ATP) release from platelets. These results suggest that the suppression of $[Ca^{2+}]_i$ elevation, and of ATP release by TSKRG are associated with upregulation of cAMP. TSKRG elevated the phosphorylation of vasodilator-stimulated phosphoprotein (VASP)-$Ser^{157}$, a cAMP-dependent protein kinase (A-kinase) substrate, but not the phosphorylation of VASP-$Ser^{239}$, a cGMP-dependent protein kinase substrate, in thrombin-activated platelets. We demonstrate that TSKRG involves in increase of cAMP level and subsequent elevation of VASP-$Ser^{157}$ phosphorylation through A-kinase activation to inhibit $[Ca^{2+}]_i$ mobilization and ATP release in thrombin-induced platelet aggregation. These results strongly indicate that TSKRG is a beneficial herbal substance elevating cAMP level in thrombin-platelet interaction, which may result in preventing of platelet aggregation-mediated thrombotic diseases.

Keywords

References

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