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• W4234286586 endingPage "2522" @default.
• W4234286586 startingPage "2514" @default.
• W4234286586 abstract "The effects of thrombopoietic stimulation on megakaryocytopoiesis, platelet production, and platelet viability and function were examined in normal volunteers randomized to receive single bolus subcutaneous injections of 3 μg/kg pegylated recombinant megakaryocyte growth and development factor (PEG-rHuMGDF) or placebo in a 3:1 ratio. PEG-rHuMGDF transiently doubled circulating platelet counts, from 237 ± 41 × 103/μL to 522 ± 90 × 103/μL (P< .0001), peaking on day 12. Baseline and day-12 samples showed no differences in responsiveness of platelets to adenosine diphosphate or thrombin receptor agonist peptide (P > .4 in all cases); expression of platelet ligand-induced binding sites or annexin V binding sites (P > .6 in both cases); or density of platelet TPO-receptors (P > .5). Platelet counts normalized by day 28. The life span of autologous 111In-labeled platelets increased from 205 ± 18 hours (baseline) to 226 ± 22 hours (P < .01) on day 8. Platelet life span decreased from 226 ± 22 hours (day 8) to 178 ± 53 hours (P < .05) on day 18. The theoretical basis for senescent changes in mean platelet life span was illustrated by biomathematical modeling. Platelet turnover increased from 43.9 ± 11.9 × 103 platelets/μL/d (baseline) to 101 ± 27.6 × 103 platelets/μL/d (P = .0009), and marrow megakaryocyte mass expanded from 37.4 ± 18.5 fL/kg to 62 ± 17 × 1010 fL/kg (P = .015). Although PEG-rHuMGDF initially increased megakaryocyte volume and ploidy, subsequently ploidy showed a transient reciprocal decrease when the platelet counts exceeded placebo values. In healthy human volunteers PEG-rHuMGDF transiently increases megakaryocytopoiesis 2-fold. Additionally, peripheral platelets expand correspondingly and exhibit normal function and viability during the ensuing 10 days. The induced perturbation in steady state thrombopoiesis resolves by 4 weeks." @default.
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• W4234286586 date "2000-04-15" @default.
• W4234286586 modified "2023-09-27" @default.
• W4234286586 title "Effects of megakaryocyte growth and development factor on platelet production, platelet life span, and platelet function in healthy human volunteers" @default.
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• W4234286586 doi "https://doi.org/10.1182/blood.v95.8.2514.008k25_2514_2522" @default.
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