ATP increases the migration of microglia across the brain endothelial cell monolayer

The cerebral microcapillary endothelium, known as the blood-brain barrier (BBB), acts as a barrier between the blood and the interstitial fluid of the brain. The BBB therefore controls the passage of nutrients into the central nervous system (CNS). Microglia show a specific affinity for migration in...

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Bibliographic Details
Published in:Bioscience reports 2016-04, Vol.36 (2)
Main Authors: Maeda, Tomoji, Inagaki, Manato, Fujita, Yu, Kimoto, Takehiro, Tanabe-Fujimura, Chiaki, Zou, Kun, Liu, Junjun, Liu, Shuyu, Komano, Hiroto
Format: Article
Language:English
Subjects:
Adenosine Triphosphate - pharmacology
Animals
Blood-Brain Barrier - metabolism
Cell Line
Endothelial Cells - metabolism
Matrix Metalloproteinase 2 - metabolism
Mice
Microglia - metabolism
Original Paper
Original Papers
Transendothelial and Transepithelial Migration - drug effects
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Summary:The cerebral microcapillary endothelium, known as the blood-brain barrier (BBB), acts as a barrier between the blood and the interstitial fluid of the brain. The BBB therefore controls the passage of nutrients into the central nervous system (CNS). Microglia show a specific affinity for migration into the CNS, and this migration appears to occur independently of BBB integrity. To study the migration of microglia across the BBB, we developed an in vitro co-culture system of mouse brain endothelial cells (MBECs) and Ra2 microglia using Transwell inserts. We first investigated the influence of microglia or ATP, a microglial chemotactic factor, on MBEC barrier integrity. The addition of microglia or ATP led to the disruption of the MBEC monolayer and significantly decreased barrier function as measured by trans-endothelial electrical resistance (TEER) and electric cell-substrate impedance sensing (ECIS). Furthermore, ATP promoted the migration of microglia but not macrophages across the MBEC monolayer. An inhibitor of matrix metalloproteinases (MMPs) decreased the transmigration of microglia in our system, indicating that MMPs play a role in microglial chemotaxis. We specifically identify a role for microglia-derived MMP-2. In conclusion, we offer evidence that microglia migration across the brain endothelial cell monolayer is increased in the presence of ATP in a manner that involves MMP secretion.
ISSN:0144-8463
1573-4935
DOI:10.1042/bsr20160054