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- W2149632020 abstract "Modulation of the biosynthesis of the vasoconstrictor peptide endothelin was studied in cultured endothelial cells. Immunoreactive endothelin (irET) levels were significantly elevated in conditioned medium from bovine pulmonary artery endothelial (BPAE) or human umbilical vein endothelial cells when coincubated with washed human platelets. Platelets (approximately 200,000 cells/microliters) enhanced irET levels approximately 250% over basal levels. Stimulation of irET levels in BPAE cell-conditioned medium by platelets was time and platelet number dependent. Platelets, as well as thrombin and transforming growth factor-beta 1, stimulated the expression of preproendothelin-1 mRNA in a time-dependent manner. Coincubation of low doses of thrombin (0.1 unit/ml) and subthreshold concentrations of platelets with BPAE cells resulted in a further enhancement of irET levels in conditioned medium. Platelet-mediated stimulation of irET production was not significantly affected by indomethacin (1 microM) or the platelet-activating factor receptor antagonist WEB 2086 (1 microM); however, coincubation of endotoxin (100 ng/ml) with platelets and BPAE cells resulted in significantly higher levels of irET. Whether direct contact or adhesion between platelets and endothelial cells is necessary for stimulating irET release was studied by separating platelets from BPAE cells with a 0.4 microns permeable membrane. Under these conditions, platelets still produced significant elevations (approximately 190% over basal levels) in irET levels in BPAE cell-conditioned medium. In addition, platelet-free buffer from agonist-induced platelet aggregation also significantly enhanced irET production (200% over basal values). These data indicate that a platelet-derived regulatory factor can induce the biosynthesis of endothelin from cultured endothelial cells and also suggest that platelets might play a role in vasomotor regulation via a novel intercellular interaction with the endothelium." @default.
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- W2149632020 date "1991-09-01" @default.
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- W2149632020 title "Platelets stimulate expression of endothelin mRNA and endothelin biosynthesis in cultured endothelial cells." @default.
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- W2149632020 doi "https://doi.org/10.1161/01.res.69.3.832" @default.
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