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논문 기본 정보

자료유형
학술저널
저자정보
Dong-Ha Lee (Korea Nazarene University)
저널정보
대한의생명과학회 대한의생명과학회지 대한의생명과학회지 제23권 제3호
발행연도
2017.9
수록면
251 - 260 (10page)

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초록· 키워드

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Platelet activation is essential at the sites of vascular injury, which leads to hemostasis through adhesion, aggregation, and secretion process. However, potent and continuous platelet activation may be an important reason of circulatory disorders. Therefore, proper regulation of platelet activation may be an effective treatment for vascular diseases. In this research, inhibitory effects of cordycepin (3"-deoxyadenosine) on platelet activation were determined. As the results, cordycepin increased cAMP and cGMP, which are intracellular Ca<SUP>2+</SUP>-antagonists. In addition, cordycepin reduced collagenelevated [Ca<SUP>2+</SUP>]i mobilization, which was increased by a cAMP-dependent protein kinase (PKA) inhibitor (Rp-8-BrcAMPS), but not a cGMP-protein kinase (PKG) inhibitor (Rp-8-Br-cGMPS). Furthermore, cordycepin increased IP<SUB>3</SUB>RI (Ser1756) phosphorylation, indicating inhibition of IP<SUB>3</SUB>-mediated Ca<SUP>2+</SUP> release from internal store via the IP<SUB>3</SUB>RI, which was strongly inhibited by Rp-8-Br-cAMPS, but was not so much inhibited by Rp-8-Br-cGMPS. These results suggest that the reduction of [Ca<SUP>2+</SUP><SUP></SUP>]i mobilization is caused by the cAMP/A-kinase-dependent IP<SUB>3</SUB>RI (Ser<SUP>1756</SUP>) phosphorylation. In addition, cordycepin increased the phosphorylation of VASP (Ser<SUP>157</SUP>) known as PKA substrate, but not VASP (Ser<SUP>239</SUP>) known as PKG substrate. Cordycepin-induced VASP (Ser<SUP>157</SUP>) phosphorylation was inhibited by Rp-8-Br-cAMPS, but was not inhibited by Rp-8-Br-cGMPS, and cordycepin inhibited collagen-induced fibrinogen binding to αIIb/β3, which was increased by Rp-8-Br-cAMPS, but was not inhibited by Rp-8-Br-cGMPS. These results suggest that the inhibition of αIIb/β<SUB>3</SUB> activation is caused by the cAMP/A-kinase-dependent VASP (Ser<SUP>157</SUP>) phosphorylation. In conclusion, these results demonstrate that inhibitory effects of cordycepin on platelet activation were due to inhibition of [Ca<SUP>2+</SUP>]i mobilization through cAMP-dependent IP<SUB>3</SUB>RI (Ser<SUP>1756</SUP>) phosphorylation and suppression of αIIb/β<SUB>3</SUB> activation through cAMP-dependent VASP (Ser<SUP>157</SUP>) phosphorylation. These results strongly indicated that cordycepin might have therapeutic or preventive potential for platelet activation-mediated disorders including thrombosis, atherosclerosis, myocardial infarction, or cardiovascular disease.

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS & DISCUSSION
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2018-510-001347548