Hsiao G |
------>authors3_c=None ------>paper_class1=1 ------>Impact_Factor=2.327 ------>paper_class3=2 ------>paper_class2=1 ------>vol=53 ------>confirm_bywho=sheujr ------>insert_bywho=geohsiao ------>Jurnal_Rank=8.6 ------>authors4_c=None ------>comm_author= ------>patent_EDate=None ------>authors5_c=None ------>publish_day=None ------>paper_class2Letter=None ------>page2=7740 ------>medlineContent= ------>unit=E1000 ------>insert_date=20051219 ------>iam=1 ------>update_date=None ------>author=??? ------>change_event=4 ------>ISSN=None ------>authors_c=None ------>score=500 ------>journal_name=J Agric Food Chem ------>paper_name=C-phycocyanin, a very potent and novel platelet aggregation inhibitor from Spirulina platensis. ------>confirm_date=20051219 ------>tch_id=088002 ------>pmid=16190625 ------>page1=7734 ------>fullAbstract=The aim of this study was to systematically examine the inhibitory mechanisms of C-phycocyanin (C-PC), one of the major phycobiliproteins of Spirulina platensis (a blue-green alga), in platelet activation. In this study, C-PC concentration-dependently (0.5-10 nM) inhibited platelet aggregation stimulated by agonists. C-PC (4 and 8 nM) inhibited intracellular Ca2+ mobilization and thromboxane A2 formation but not phosphoinositide breakdown stimulated by collagen (1 microg/mL) in human platelets. In addition, C-PC (4 and 8 nM) markedly increased levels of cyclic GMP and cyclic GMP-induced vasodilator-stimulated phosphoprotein (VASP) Ser(157) phosphorylation. Rapid phosphorylation of a platelet protein of Mw 47,000 (P47), a marker of protein kinase C activation, was triggered by phorbol-12,13-dibutyrate (150 nM). This phosphorylation was markedly inhibited by C-PC (4 and 8 nM). In addition, C-PC (4 and 8 nM) markedly reduced the electron spin resonance (ESR) signal intensity of hydroxyl radicals in collagen (1 microg/mL)-activated platelets. The present study reports on a novel and very potent (in nanomolar concentrations) antiplatelet agent, C-PC, which is involved in the following inhibitory pathways: (1) C-phycocyanin increases cyclic GMP/VASP Ser157 phosphorylation and subsequently inhibits protein kinase C activity, resulting in inhibition of both P47 phosphorylation and intracellular Ca2+ mobilization, and (2) C-PC may inhibit free radicals (such as hydroxyl radicals) released from activated platelets, which ultimately inhibits platelet aggregation. These results strongly indicate that C-PC appears to represent a novel and potential antiplatelet agent for treatment of arterial thromboembolism. ------>tmu_sno=None ------>sno=12332 ------>authors2=Chou PH ------>authors3=Shen MY ------>authors4=Chou DS ------>authors5=Lin CH ------>authors6=Sheu JR ------>authors6_c=None ------>authors=Hsiao G ------>delete_flag=0 ------>SCI_JNo=None ------>authors2_c=None ------>publish_area=None ------>updateTitle=C-phycocyanin, a very potent and novel platelet aggregation inhibitor from Spirulina platensis. ------>language=2 ------>check_flag=None ------>submit_date=None ------>country=None ------>no=20 ------>patent_SDate=None ------>update_bywho=None ------>publish_year=2005 ------>submit_flag=None ------>publish_month=None |