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- W2229929454 abstract "We examined the mechanisms of platelet uptake in the lungs after alpha-thrombin-induced pulmonary microembolism. Platelets labeled with 111In-oxine were reinfused into chronically prepared sheep. Pulmonary microembolism resulted in an increase in lung platelet radioactivity (95.5 +/- 15.3%; n = 4), which was followed by an exponential washout (half-life = 115 +/- 4 min). Platelet uptake in the lungs was more sustained after prior fibrinolytic inhibition with tranexamic acid (half-life = 178 +/- 11 min), although the initial increase was similar (90.7 +/- 9.6%; n = 7). Prior depletion of fibrinogen with ancrod (Arvin), blunted the initial increase in lung platelet uptake after alpha-thrombin challenge (31.7 +/- 11.3%, n = 5), indicating that the effect of thrombin was markedly dependent on fibrinogen. We examined the role of circulating granulocytes, since platelets may bind to subendothelial matrix exposed after granulocyte-mediated lung vascular injury. Maximal pulmonary platelet uptake after thrombin in granulocytopenic sheep was not different from control (71.7 +/- 14.4%; n = 4). The results indicate that pulmonary microembolism results in lung platelet sequestration. Platelet uptake is not dependent on granulocyte-mediated vascular injury but requires fibrin deposition and is sustained if fibrinolysis is inhibited." @default.
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- W2229929454 date "1988-10-01" @default.
- W2229929454 modified "2023-09-27" @default.
- W2229929454 title "Determinants of platelet kinetics: effects of pulmonary microembolism" @default.
- W2229929454 doi "https://doi.org/10.1152/jappl.1988.65.4.1716" @default.
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