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- W2127221366 abstract "The intracellular mechanisms underlying oxidized low-density lipoprotein (oxLDL)-signaling pathways in platelets are not yet completely understood. Therefore, the aim of this study was to further examine the effects of oxLDL in prevention of platelet aggregation. In this study, oxLDL concentration-dependently (40–120 $upmu$ g/ml) inhibited platelet aggregation in human platelet-rich plasma stimulated by agonists. Moreover, oxLDL (40 and 80 $upmu$ g/ml) markedly decreased the fluorescence intensity of platelet membranes tagged with diphenylhexatriene. Rapid phosphorylation of a protein of Mr 47,000 (P47), a marker of protein kinase C activation, was triggered by PDBu (150 nM). This phosphorylation was markedly inhibited by oxLDL (40 and 80 $upmu$ g/ml) in phosphorus-32-labeled platelets. In addition, oxLDL (40 and 80 $upmu$ g/ml) markedly increased levels of cyclic AMP and cyclic AMP-induced vasodilator-stimulated phosphoprotein (VASP) Ser157 phosphorylation. The thrombin-evoked increase in pHi was inhibited in the presence of oxLDL (40 and 80 $upmu$ g/ml). These results indicate that the antiplatelet activity of oxLDL may involve the following pathways. (1) oxLDL may initially induce conformational changes in platelet membranes, leading to inhibition of the activation of protein kinase C, followed by inhibition of P47 protein phosphorylation, and intracellular Ca2+ mobilization. (2) oxLDL also activated formation of cyclic AMP and cyclic AMP-induced VASP Ser157 phosphorylation, resulting in inhibition of the Na+/H+exchanger; this leads to reduced intracellular Ca2+ mobilization, and ultimately to inhibition of platelet aggregation. This study further provides new insights concerning the effects of low concentrations of oxLDL on platelet aggregation." @default.
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- W2127221366 date "2005-11-09" @default.
- W2127221366 modified "2023-10-13" @default.
- W2127221366 title "Inhibitory mechanisms of low concentrations of oxidized low-density lipoprotein on platelet aggregation" @default.
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- W2127221366 doi "https://doi.org/10.1007/s11373-005-9042-x" @default.
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