Abstract
The ability of the neutrophil myeloperoxidase-hydrogen peroxide-halide system to induce the release of human platelet constituents was examined. Both lytic and nonlytic effects on platelets were assessed by comparison of the simultaneously measured release of a dense-granule marker, [3H]serotonin, and a cytoplasmic marker, [14C]adenine. Incubation of platelets with H2O2 alone (20 μM H2O2 for 10 min) resulted in a small, although significant, release of both serotonin and adenine, suggesting some platelet lysis. Substantial release of these markers was observed only with increased H2O2 concentrations (>0.1 mM) or prolonged incubation (1-2 h).
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