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- W2065697598 abstract "The mechanisms by which endothelin-1 (ET-1) acts on polymorphonuclear leukocytes (PMN) are insufficiently known. In this study, we assessed the hypotheses that ET-1 is a PMN-aggregating agent, and that platelet-activating factor (PAF) is the principal mediator of ET-1-induced PMN aggregation. ET-1 induced dose-related PMN aggregation, which started 1 min after ET-1 exposure. Two different specific PAF receptor antagonists blocked the effect of ET-1 on PMN aggregation. In addition, FT-1 induced a significant increase in the production of PAF by PMN after 2 to 5 min of FT-1 incubation. FT 1 induced PAF release from PMN rather than accumulation. This PAF production was dependent on intra- and extracellular Ca2+. In this regard, the PAF receptor antagonists significantly blunted the ET-1-induced peak in cytosolic free Ca2+ ([Ca2+ ]i). Our results, therefore, indicate that ET-1 is effective in causing aggregation of human PMN and that its action appears to be mediated by PAF production via a Ca2+-dependent mechanism." @default.
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- W2065697598 date "1992-12-01" @default.
- W2065697598 modified "2023-10-18" @default.
- W2065697598 title "Aggregation of human polymorphonuclear leukocytes by endothelin: role of platelet-activating factor" @default.
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- W2065697598 doi "https://doi.org/10.1016/0014-2999(92)90801-a" @default.
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