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- W157060742 abstract "The combined presence of platelets (PLTS) and neutrophils (PMN) at inflammatory sites has led to examination of the hypothesis that interaction of these cells modulates their responses to stimuli. Gel-filtered human PLTS (GFP) were found to inhibit N-formyl-met-leu-phe (FMLP) and phorbol myristate acetate (PMA) stimulated PMN O/sub 2//sup -/ generation in a concentration-dependent fashion. The heat-stable inhibitory activity was present in the supernatants of GFP after incubation with FMLP (10/sup -7/M), thrombin (0.5 U/ml) or ADP (20 ..mu..M), suggesting a role for PLT release products. PLT lysates added to PMN produced up to 80% inhibition of O/sub 2//sup -/ generation for PMA and 40% for FMLP. Like GFP, lysates failed to scavenge O/sub 2/..pi.. produced by xanthine oxidase-hypoxanthine. The inhibitory activity could not be ascribed to serotonin or adenosine. PLT lysates failed to compete with /sup 3/H-FMLP for binding to PMN. Sephadex G-200 fractionation of PLT lysates releaved two peaks of inhibitory activity with apparent Mr > 200,000 and < 14,000 Daltons. Pretreatment of PMN with PLT lysates also results in a concentration-dependent inhibition of degranulation provoked by FMLP (2 x 10/sup -7/M) or PMA (2 ng/ml) and PMN chemotaxis to FMLP (10/sup -8/M). These studies indicate that preformed PLTmore » mediator(s) released in response to physiological stimuli may limit tissue damage by PMN at sites of inflammation.« less" @default.
- W157060742 created "2016-06-24" @default.
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- W157060742 date "1986-03-01" @default.
- W157060742 modified "2023-09-24" @default.
- W157060742 title "Platelet modulation of human neutrophil functions" @default.
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