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• W2003264244 abstract "The anticoagulant factor protein S (PS) has direct cellular activities. Lack of PS in mice causes lethal coagulopathy, ischemic/thrombotic injuries, vascular dysgenesis, and blood-brain barrier (BBB) disruption with intracerebral hemorrhages. Thus, we hypothesized that PS maintains and/or enhances the BBB integrity. Using a BBB model with human brain endothelial cells, we show PS inhibits time- and dose-dependently (half maximal effective concentration [EC(50)] = 27 +/- 3 nM) oxygen/glucose deprivation-induced BBB breakdown, as demonstrated by measurements of the transmonolayer electrical resistance, permeability of endothelial monolayers to dextran (40 kDa), and rearrangement of F-actin toward the cortical cytoskeletal ring. Using Tyro-3, Axl, and Mer (TAM) receptor, tyrosine kinase silencing through RNA interference, specific N-terminus-blocking antibodies, Tyro3 phosphorylation, and Tyro3-, Axl- and Mer-deficient mouse brain endothelial cells, we show that Tyro3 mediates PS vasculoprotection. After Tyro3 ligation, PS activated sphingosine 1-phosphate receptor (S1P(1)), resulting in Rac1-dependent BBB protection. Using 2-photon in vivo imaging, we show that PS blocks postischemic BBB disruption in Tyro3(+/+), Axl(-/-), and Mer(-/-) mice, but not in Tyro3(-/-) mice or Tyro3(+/+) mice receiving low-dose W146, a S1P(1)-specific antagonist. Our findings indicate that PS protects the BBB integrity via Tyro3 and S1P(1), suggesting potentially novel treatments for neurovascular dysfunction resulting from hypoxic/ischemic BBB damage." @default.
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• W2003264244 date "2010-06-10" @default.
• W2003264244 modified "2023-10-18" @default.
• W2003264244 title "Protein S controls hypoxic/ischemic blood-brain barrier disruption through the TAM receptor Tyro3 and sphingosine 1-phosphate receptor" @default.
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• W2003264244 doi "https://doi.org/10.1182/blood-2010-01-262386" @default.
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