Shear Stress-Induced Aggregation of Oxidized Platelets
Resource
THROMBOSIS RESEARCH v.105 n.4 pp.325-329
Journal
THROMBOSIS RESEARCH
Journal Volume
v.105
Journal Issue
n.4
Pages
325-329
Date Issued
2002
Date
2002
Author(s)
WANG, SHOEI-SHEN
Abstract
Although shear stress-induced platelet aggregation (SIPA) has been noted, the shear stress-induced aggregation of oxidized platelets (SIOPA) has not been investigated. To investigate SIOPA, small quantity of hemoglobin (Hb) Solution was first added to plasma to induce oxidation stress of platelets and then the plasma was sheared by a cone/plate viscometer at shear stress of 66 dyn/cm(2). In addition, to investigate the change in expression of the membrane receptors of glycoprotein lb (Gplb) for oxidized platelets, mean fluorescence intensity (MFI) for those platelets was detected by flow cytometric technique. The results showed that the level of the oxidation stress of platelets, as presented in malondialdehyde (MDA) values, was well correlated with the quantities of added Hb. Moreover, the aggregation of SIOPA corresponded with the levels of oxidation stress of platelets. Platelets pretreated with aspirin could only partially reduce the aggregation of SIOPA . Similarly, aspirin pretreatment could partially reduce the lowering of MFI value that indicated downexpression of Gplb receptors. Furthermore, the aggregations of SIOPA corresponded with the lowered percentage of those MF1 values for studied cases. We thereby suggested that the aggregation of SIOPA is related to both the level of oxidation stress and the downexpression of Gplb receptors for oxidized platelets. (C) 2002 Elsevier Science Ltd. All rights reserved.
Subjects
oxidation stress of platelets
the expression of GpIb receptors
SIOPA
VON-WILLEBRAND-FACTOR
HYDROXYL RADICALS
HYDROGEN-PEROXIDE
Type
journal article