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Acta Neuropathologica
Published in: Acta Neuropathologica 5/2010

01-05-2010 | Original Paper

Gene expression analysis of the microvascular compartment in multiple sclerosis using laser microdissected blood vessels

Authors: Paula Cunnea, Jill McMahon, Enda O’Connell, Kaveh Mashayekhi, Una Fitzgerald, Stephen McQuaid

Published in: Acta Neuropathologica | Issue 5/2010

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Abstract

The blood brain barrier (BBB) is formed by capillary endothelial cells with inter-endothelial cell tight junctions and other cells such as pericytes and astrocytes present. Previous studies have shown a role for tight junction abnormalities in BBB leakage in multiple sclerosis (MS) brain. This marks a key stage in the development of inflammatory demyelination in MS. The aim of this study was to identify aberrantly expressed genes involved in BBB changes in MS lesions. A focused endothelial cell biology microarray, capable of detecting changes in expression of 113 endothelial cell-specific genes, was employed to analyse endothelial cell mRNA extracted from post-mortem control white matter, MS normal appearing white matter (NAWM), chronic active or inactive lesions by laser capture microdissection. Microarray analysis found 52 genes out of 113 analysed, predominantly in the activation functional group, to be differentially expressed in lesions compared to control or NAWM (p < 0.01). The majority of the differentially expressed genes were validated by quantitative real time PCR. In addition, the protein expression profiles of ICAM2, MMP2, and VEGFR1 were examined by immunofluorescent staining of selected tissue blocks. ICAM-2 was expressed at a higher level in chronic inactive lesions than control or NAWM, corresponding with the increased mRNA measured by microarray and real time PCR. The data shown, presenting a number of differentially expressed genes in the microvascular compartment of MS lesions, may shed light on the molecular mechanisms that are involved in the breakdown of the BBB. This moves us a step closer to the identification of potential therapeutic targets for repair of the compromised BBB.
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Metadata
Title
Gene expression analysis of the microvascular compartment in multiple sclerosis using laser microdissected blood vessels
Authors
Paula Cunnea
Jill McMahon
Enda O’Connell
Kaveh Mashayekhi
Una Fitzgerald
Stephen McQuaid
Publication date
01-05-2010
Publisher
Springer-Verlag
Published in
Acta Neuropathologica / Issue 5/2010
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-009-0618-9

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