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Departments of 1 Anesthesiology and Intensive Care, 2 Molecular Cell Biology, and 3 Experimental Cardiology, Max Planck Institute for Physiological and Clinical Research, 61231 Bad Nauheim, Germany
In this study, an in vitro model of the blood-brain barrier,
consisting of porcine brain-derived microvascular endothelial cells
(BMEC), was used to evaluate the mechanism of hypoxia-induced hyperpermeability. We show that hypoxia-induced permeability in BMEC
was completely abolished by a neutralizing antibody to vascular endothelial growth factor (VEGF). In contrast, under normoxic conditions, addition of VEGF up to 100 ng/ml did not alter monolayer barrier function. Treatment with either hypoxia or VEGF under normoxic
conditions induced a twofold increase in VEGF binding sites and VEGF
receptor 1 (Flt-1) mRNA expression in BMEC. Hypoxia-induced permeability also was prevented by the nitric oxide (NO) synthase inhibitor NG-monomethyl-L-arginine,
suggesting that NO is involved in hypoxia-induced permeability changes,
which was confirmed by measurements of the cGMP level. During normoxia,
treatment with VEGF (5 ng/ml) increased permeability as well as cGMP
content in the presence of several antioxidants. These results suggest
that hypoxia-induced permeability in vitro is mediated by the VEGF/VEGF
receptor system in an autocrine manner and is essentially dependent on
reducing conditions stabilizing the second messenger NO as the mediator
of changes in barrier function of BMEC.
blood-brain barrier; endothelial barrier function; hyperpermeability; nitric oxide; vascular endothelial growth factor
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