Background: Vascular endothelial growth factor (VEGF) and its receptors regulate angiogenesis (formation of blood vessels). The soluble VEGF receptor 1 (sFlt-1) binds VEGF as a potent antagonist.
Objective: The objective of this study was to compare VEGF and sFlt-1 levels in milk from mothers of preterm (n = 50) versus term (n = 49) infants in a longitudinal study.
Methods: Milk samples were collected on days 3 and 28 of lactation. Vascular endothelial growth factor and sFlt-1 were quantified by sandwich-type enzyme-linked immunosorbent assay.
Results: Vascular endothelial growth factor and sFlt-1 were found in high concentrations in early milk (lactation day 3) from mothers of preterm and term infants and were lower in mature milk (lactation day 28). On day 3, median VEGF concentration was lower in preterm than in term milk (37.1 vs 53.9 ng/mL, P < .01). Otherwise, VEGF (day 28) and sFlt-1 (days 3 and 28) did not differ in preterm versus term milk.
Conclusions: It was shown for the first time that sFlt-1 is present in human milk. Early human milk contains high concentrations of VEGF and sFlt-1, which decrease over the course of lactation.
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