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Erschienen in: Acta Neuropathologica 6/2008

01.06.2008 | Original Paper

Decreased junctional adhesion molecule-A expression during blood–brain barrier breakdown

verfasst von: Dennis Yeung, Janet L. Manias, Duncan J. Stewart, Sukriti Nag

Erschienen in: Acta Neuropathologica | Ausgabe 6/2008

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Abstract

Tight junctions between brain endothelial cells are one of the specialized structural components of the blood–brain barrier (BBB) to proteins. Research in the last decade has demonstrated that the integral membrane proteins of cerebral endothelial tight junctions are claudin, occludin, and junctional adhesion molecule (JAM). Altered expression of these tight junction proteins could cause BBB breakdown following brain injury leading to edema. In this study, expression of JAM-A, was analyzed by immunostaining and immunoblotting in the rat cortical cold injury model, a well-characterized in vivo model of BBB breakdown. Temporal and spatial expression of JAM-A was examined at 12 hours, days 2, 4, and 6 post-lesion in cold-injured and control rats. Control rats showed punctate JAM-A immunoreactivity at intervals along the circumference of the endothelial layer at tight junctions where JAM-A colocalized with occludin. A significant decrease in JAM-A expression was noted at the lesion site by immunoblotting at 12 h only. At this time period, lesion vessels showed loss of endothelial JAM-A immunostaining while day 2 onwards, there was recovery of endothelial JAM-A immunoreactivity. Dual labelling for JAM-A and fibronectin showed that only lesion vessels with BBB breakdown to fibronectin at 12 h also showed lack of endothelial JAM-A immunoreactivity supporting the evidence that JAM-A contributes to tight junction integrity.
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Metadaten
Titel
Decreased junctional adhesion molecule-A expression during blood–brain barrier breakdown
verfasst von
Dennis Yeung
Janet L. Manias
Duncan J. Stewart
Sukriti Nag
Publikationsdatum
01.06.2008
Verlag
Springer-Verlag
Erschienen in
Acta Neuropathologica / Ausgabe 6/2008
Print ISSN: 0001-6322
Elektronische ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-008-0364-4

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