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Cordycepin (3'-deoxyadenosine) Has an Anti-platelet Effect by Regulating the cGMP-Associated Pathway of Human Platelet Activation

  • Cho, Hyun-Jeong (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering, and Regional Research Center, Inje University) ;
  • Rhee, Man-Hee (Department of Physiology, College of Veterinary Medicine, Kyungpook National University) ;
  • Cho, Jae-Youl (School of Bioscience and Biotechnology, Kangwon National University) ;
  • Kim, Hyeong-Soo (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering, and Regional Research Center, Inje University) ;
  • Ok, Woo-Jeong (Department of Biomedical Laboratory Science, College of Biomedical Science and Engineering, and Regional Research Center, Inje University) ;
  • Kang, Hee-Jin (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)
  • Published : 2007.09.30

Abstract

Cordycepin (3'-deoxyadenosine), which comes from Cordyceps militaris, the Chinese medicinal fungal genus Cordyceps, is used in the treatment of various diseases such as cancer and chronic inflammation. We recently reported that cordycepin has a novel antiplatelet effect through the down regulation of $[Ca^{2+}]_{i}$ and the elevation of cGMP/cAMP production. In this study, we further investigated the effect of cordycepin on collagen-induced platelet aggregation in the presence of cGMP-dependent protein kinase (PKG)- or cAMP-dependent protein kinase (PKA)-inhibitor. PKG inhibitor Rp-8-pCPT-cGMPS potentiated the collagen-induced platelet aggregation, but PKA inhibitor Rp-8-Br-cAMPS did not. However, both Rp-8-pCPT-cGMPS and Rp-8-Br-cAMPS reduced inhibition by cordycepin of collagen-induced platelet aggregation. Moreover, cordycepin inhibited $Ca^{2+}-dependent$ phosphorylation of both 47 kDa- and 20 kDa-protein in the presence of both PKG inhibitor and PKA inhibitor. Taken altogether, these results suggest that the inhibitory effect of cordycepin on collagen-induced platelet aggregation is associated with cGMP/PKG- and cAMP/PKA-pathways, and thus cordycepin may be an efficacious intervention against platelet aggregation-mediated thrombotic disease.

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