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- W1992184562 abstract "Summary. Background: Unusually large von Willebrand factor (VWF) multimers have been observed in patients with thrombotic microangiopathies (TMA), and absence of the VWF cleaving protease ADAMTS-13 activity is considered to be involved in the etiology of TMA. Increased amounts of large multimers of VWF have also been identified in neonates. Objective: We assessed ADAMTS-13 activity in healthy neonates, children and adults to establish baseline levels. Patients and methods: Cord blood was collected from 38 full-term newborns; venous samples were taken from 15 neonates on day 2–3 of life. Seventeen children, 24 healthy adults and seven patients with TMA were studied as well. ADAMTS-13 activity was quantified by the binding of the subjects' plasma VWF to collagen before and after enzyme activation. The multimer distribution of VWF was also determined. Results: Neonates and children had percentage ADAMTS-13 activity similar to adults. However, two groups were apparent in the cord blood samples: while 28/38 newborns had percentage activity within the normal range of healthy adults (102 ± 3.0%), 10 had significantly lower percentage activity (53 ± 1.1%; P < 0.0001) that normalized by day 2–3. The VWF multimer distribution was the same in all cord blood samples and was not different compared with children and adults. High-molecular-weight VWF multimers were significantly increased in the 2–3-day-old neonates and in TMA patients. Conclusions: Although ADAMTS-13 activity was similar in neonates compared with adults, 26% of neonates had mildly reduced activity. Further studies are needed to investigate the complex interaction of VWF production and secretion with its size control by ADAMTS-13 in different age groups." @default.
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- W1992184562 date "2004-02-01" @default.
- W1992184562 modified "2023-10-12" @default.
- W1992184562 title "The activity of the von Willebrand factor cleaving protease ADAMTS‐13 in newborn infants" @default.
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- W1992184562 doi "https://doi.org/10.1046/j.1538-7933.2003.00575.x" @default.
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