Treatment of human blood platelets with the thiol-oxidizing agent, diamide, causes rapid oxidation of glutathione and alterations in aggregation and release reaction. Moreover, cross-linking of proteins was observed. Three high molecular weight bands of 200 – 240 × 103 daltons and a band of 66 × 103 daltons were involved in this process. After reduction with dithiotreitol the normal pattern was received. In contrast to the erythrocyte, the cross-linking of platelet proteins was not accompanied by a reorientation of phosphatidylethanolamine in the membrane. Also a considerably smaller effect of diamide on platelet protein sulfhydryl group content was measured.

Keywords:
Diamide, Human blood platelets, Phosphatidylethanolamine labeling, SDS electrophoresis, Sulfhydryl groups
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© 1982 S. Karger AG, Basel
1982
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