The epithelial membrane protein 1 is a novel tight junction protein of the blood-brain barrier

In the central nervous system, a constant microenvironment required for neuronal cell activity is maintained by the blood—brain barrier (BBB). The BBB is formed by the brain microvascular endothelial cells (BMEC), which are sealed by tight junctions (TJ). To identify genes that are differentially ex...

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Veröffentlicht in:Journal of cerebral blood flow and metabolism 2008-06, Vol.28 (6), p.1249-1260
Hauptverfasser: Bangsow, Thorsten, Baumann, Ewa, Bangsow, Carmen, Jaeger, Martina H, Pelzer, Bernhard, Gruhn, Petra, Wolf, Sabine, von Melchner, Harald, Stanimirovic, Danica B
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container_end_page 1260
container_issue 6
container_start_page 1249
container_title Journal of cerebral blood flow and metabolism
container_volume 28
creator Bangsow, Thorsten
Baumann, Ewa
Bangsow, Carmen
Jaeger, Martina H
Pelzer, Bernhard
Gruhn, Petra
Wolf, Sabine
von Melchner, Harald
Stanimirovic, Danica B
description In the central nervous system, a constant microenvironment required for neuronal cell activity is maintained by the blood—brain barrier (BBB). The BBB is formed by the brain microvascular endothelial cells (BMEC), which are sealed by tight junctions (TJ). To identify genes that are differentially expressed in BMEC compared with peripheral endothelial cells, we constructed a subtractive cDNA library from porcine BMEC (pBMEC) and aortic endothelial cells (AOEC). Screening the library for differentially expressed genes yielded 26 BMEC-specific transcripts, such as solute carrier family 35 member F2 (SLC35F2), ADP-ribosylation factor-like 5B (ARL5B), TSC22 domain family member 1 (TSC22D1), integral membrane protein 2A (ITM2A), and epithelial membrane protein 1 (EMP1). In this study, we show that EMP1 transcript is enriched in pBMEC compared with brain tissue and that EMP1 protein colocalizes with the TJ protein occludin in mouse BMEC by coimmunoprecipitation and in rat brain vessels by immunohistochemistry. Epithelial membrane protein 1 expression was transiently induced in laser-capture microdissected rat brain vessels after a 20-min global cerebral ischemia, in parallel with the loss of occludin immunoreactivity. The study identifies EMP1 as a novel TJ-associated protein of the BBB and suggests its potential role in the regulation of the BBB function in cerebral ischemia.
doi_str_mv 10.1038/jcbfm.2008.19
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subjects Amino Acid Sequence
Animals
Biological and medical sciences
Blood-Brain Barrier - metabolism
Brain Ischemia - genetics
Brain Ischemia - metabolism
Cells, Cultured
Conserved Sequence
Gene Expression Regulation
Humans
Injuries of the nervous system and the skull. Diseases due to physical agents
Medical sciences
Molecular Sequence Data
Neoplasm Proteins - chemistry
Neoplasm Proteins - genetics
Neoplasm Proteins - metabolism
Neurology
Receptors, Cell Surface - chemistry
Receptors, Cell Surface - genetics
Receptors, Cell Surface - metabolism
Sequence Alignment
Swine
Tight Junctions - metabolism
Traumas. Diseases due to physical agents
Vascular diseases and vascular malformations of the nervous system
title The epithelial membrane protein 1 is a novel tight junction protein of the blood-brain barrier
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