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  • Title: Astrocyte-conditioned medium induces blood-brain barrier properties in endothelial cells.
    Author: Yamagata K, Tagami M, Nara Y, Mitani M, Kubota A, Fujino H, Numano F, Kato T, Yamori Y.
    Journal: Clin Exp Pharmacol Physiol; 1997; 24(9-10):710-3. PubMed ID: 9315374.
    Abstract:
    1. We evaluated the induction of endothelial barrier functions by the type 1 astrocyte-derived supernatant in culture using horseradish peroxidase (HRP) as a parameter. 2. A gel filtration fraction (molecular weight 16-20 kDa) of type 1 astrocyte-derived supernatant reduced plasmalemmal vesicles and induced tight junctions in endothelial cells. 3. In addition, this fraction promoted the uptake of [3H]-glucosamine by endothelial cells. This cell activity disappeared after heating at 95 degrees C for 10 min and was sensitive to trypsin. 4. These results suggest that a type 1 astrocyte-derived protein factor(s) promotes proteoglycan synthesis with a resultant increase in charge selectivity in endothelial cells and plays an important role in the induction of blood-brain barrier functions.
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