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Permeable Endothelium and the Interstitial Space of Brain

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Abstract

1. Fenestrated vessels can be reversibly induced in brain by agents that stimulate urokinase production. This plasminogen activator, like vascular endothelial growth factor and metalloproteinases, is secreted by tumor cells and may account for induction of fenestrated vessels. Why only some of the brain's barrier vessels are converted to fenestrated vessels is unknown.

2. The structures responsible for the filtering of solutes by fenestrated vessels may be the same as those of continuous, less permeable vessels: the glycocalyx on the surfaces of the endothelial cells and the subendothelial basal lamina.

3. Solutes leaving the cerebral ventricles immediately enter the interstitial clefts between the cells lining the ventricles. A fraction of a variety of solutes, injected into CSF compartments, is retained by subendothelial basal lamina, from which the solutes may be released in a regulated way.

4. The brain's CSF and interstitial clefts are the conduits for nonsynaptic volume transmission of diffusible signals, e.g., ions, neurotransmitters, and hormones. This type of transmission could be abetted by a parallel, cell-to-cell volume transmission mediated by gap junctions between astrocytes bordering CSF compartments and parenchymal astrocytes.

5. The width and contents of the interstitial clefts in fetal brain permit cell migration and outgrowth of neurites. The contents of the narrower and different interstitial clefts of mature brain permit solute convection but must be enzymatically degraded in order for cells to migrate through it.

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  1. Laboratory of Neurobiology, National Institutes of Health, Bethesda, Maryland, 20892-4062

    Milton W. Brightman & Mehmet Kaya

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  1. Milton W. Brightman
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Brightman, M.W., Kaya, M. Permeable Endothelium and the Interstitial Space of Brain. Cell Mol Neurobiol 20, 111–130 (2000). https://doi.org/10.1023/A:1006944203934

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