Neonatal excitotoxicity modifies blood-brain barrier properties increasing its susceptibility to hypertonic shock in adulthood.

08:00 EDT 21st March 2020 | BioPortfolio

Summary of "Neonatal excitotoxicity modifies blood-brain barrier properties increasing its susceptibility to hypertonic shock in adulthood."

Early responses to a neurological excitotoxic process include blood-brain barrier (BBB) impairment and overexpression of vascular endothelial growth factor (VEGF), but the long-term effects of excitotoxicity on the BBB properties remain unknown. To assess this, we induced an excitotoxic process on male rats by neonatal monosodium glutamate (MSG) treatment. At postnatal day 60, we measured the expression level of structural proteins of the BBB and the VEGF type-2 receptor (VEGFR-2) protein in the cerebral motor cortex (CMC), striatum, hippocampus, entorhinal cortex, and hypothalamus. We also measured BBB permeability in the same cerebral regions. Neonatal MSG treatment significantly reduced the protein expression level of claudin-5 in the CMC, and of ZO-1 in the CMC and hippocampus and increased the expression level of PV1 (plasmalemmal vesicle-associated protein) in the CMC and of VEGFR-2 in all regions except for the hypothalamus. BBB permeability was significantly higher in all studied regions of MSG-treated animals after hypertonic shock (HS). The increased BBB permeability observed in the MSG-treated animals after HS was reversed by VEGFR-2 inhibition with SU5416. We conclude that neonatal excitotoxicity leads to lasting impairment on BBB properties in adulthood, increasing its susceptibility to HS that could be regulated by VEGFR-2 activity inhibition.


Journal Details

This article was published in the following journal.

Name: International journal of developmental neuroscience : the official journal of the International Society for Developmental Neuroscience
ISSN: 1873-474X


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The property of blood capillary ENDOTHELIUM that allows for the selective exchange of substances between the blood and surrounding tissues and through membranous barriers such as the BLOOD-AIR BARRIER; BLOOD-AQUEOUS BARRIER; BLOOD-BRAIN BARRIER; BLOOD-NERVE BARRIER; BLOOD-RETINAL BARRIER; and BLOOD-TESTIS BARRIER. Small lipid-soluble molecules such as carbon dioxide and oxygen move freely by diffusion. Water and water-soluble molecules cannot pass through the endothelial walls and are dependent on microscopic pores. These pores show narrow areas (TIGHT JUNCTIONS) which may limit large molecule movement.

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Specialized non-fenestrated tightly-joined ENDOTHELIAL CELLS with TIGHT JUNCTIONS that form a transport barrier for certain substances between the cerebral capillaries and the BRAIN tissue.

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