Dabigatran Abrogates Brain Endothelial Cell Permeability in Response to Thrombin

Atrial fibrillation (AF) increases the risk and severity of thromboembolic stroke. Generally, antithrombotic agents increase the hemorrhagic risk of thromboembolic stroke. However, significant reductions in thromboembolism and intracerebral hemorrhage have been shown with the antithrombin dabigatran...

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Veröffentlicht in:Journal of cerebral blood flow and metabolism 2015-06, Vol.35 (6), p.985-992
Hauptverfasser: Hawkins, Brian Thomas, Gu, Yu-Huan, Izawa, Yoshikane, del Zoppo, Gregory John
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container_issue 6
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creator Hawkins, Brian Thomas
Gu, Yu-Huan
Izawa, Yoshikane
del Zoppo, Gregory John
description Atrial fibrillation (AF) increases the risk and severity of thromboembolic stroke. Generally, antithrombotic agents increase the hemorrhagic risk of thromboembolic stroke. However, significant reductions in thromboembolism and intracerebral hemorrhage have been shown with the antithrombin dabigatran compared with warfarin. As thrombin has been implicated in microvessel injury during cerebral ischemia, we hypothesized that dabigatran decreases the risk of intracerebral hemorrhage by direct inhibition of the thrombin-mediated increase in cerebral endothelial cell permeability. Primary murine brain endothelial cells (mBECs) were exposed to murine thrombin before measuring permeability to 4-kDa fluorescein isothiocyanate-dextran. Thrombin increased mBEC permeability in a concentration-dependent manner, without significant endothelial cell death. Pretreatment of mBECs with dabigatran completely abrogated the effect of thrombin on permeability. Neither the expressions of the endothelial cell β1-integrins nor the tight junction protein claudin-5 were affected by thrombin exposure. Oxygen-glucose deprivation (OGD) also increased permeability; this effect was abrogated by treatment with dabigatran, as was the additive effect of thrombin and OGD on permeability. Taken together, these results indicate that dabigatran could contribute to a lower risk of intracerebral hemorrhage during embolism-associated ischemia from AF by protection of the microvessel permeability barrier from local thrombin challenge.
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Neither the expressions of the endothelial cell β1-integrins nor the tight junction protein claudin-5 were affected by thrombin exposure. Oxygen-glucose deprivation (OGD) also increased permeability; this effect was abrogated by treatment with dabigatran, as was the additive effect of thrombin and OGD on permeability. 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subjects Animals
Antithrombins - pharmacology
Benzimidazoles - pharmacology
beta-Alanine - analogs & derivatives
beta-Alanine - pharmacology
Brain - cytology
Brain - drug effects
Brain - metabolism
Cell Survival - drug effects
Cells, Cultured
Claudin-5 - analysis
Dabigatran
Endothelial Cells - cytology
Endothelial Cells - drug effects
Endothelial Cells - metabolism
Glucose - metabolism
Integrin beta1 - analysis
Male
Mice
Mice, Inbred C57BL
Original
Oxygen - metabolism
Permeability - drug effects
Thrombin - metabolism
title Dabigatran Abrogates Brain Endothelial Cell Permeability in Response to Thrombin
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