Brain endothelial hemostasis regulation by pericytes

Pericytes are known to regulate brain capillary endothelial functions. The purpose of this study was to define the hemostatic regulatory role of human brain pericytes. We used blood–brain barrier models consisting of human pericytes grown on transwell membrane inserts and cocultured with human brain...

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Veröffentlicht in:Journal of cerebral blood flow and metabolism 2006-02, Vol.26 (2), p.209-217
Hauptverfasser: Kim, Jeong Ai, Tran, Nam D, Li, Zhen, Yang, Fan, Zhou, Weilin, Fisher, Mark J
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container_issue 2
container_start_page 209
container_title Journal of cerebral blood flow and metabolism
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creator Kim, Jeong Ai
Tran, Nam D
Li, Zhen
Yang, Fan
Zhou, Weilin
Fisher, Mark J
description Pericytes are known to regulate brain capillary endothelial functions. The purpose of this study was to define the hemostatic regulatory role of human brain pericytes. We used blood–brain barrier models consisting of human pericytes grown on transwell membrane inserts and cocultured with human brain microvascular endothelial cells (HBEC), or pericytes grown in direct contact with HBEC. When grown in cocultures in which pericytes were physically separated from endothelial cells, pericytes induced significant changes in endothelial tissue plasminogen activator (tPA) messenger ribonucleic acid (mRNA) and protein: tPA mRNA level was decreased in pericyte cocultures (52% ± 25% of monocultures, P < 0.05) and tPA protein level was decreased (66% ± 23% of monocultures, P < 0.05). Pericyte effects on endothelial fibrinolysis were enhanced when the two cell types were cocultured in direct contact, with tPA protein reduced in cocultures compared with monocultures (25% ± 15% of monocultures, P < 0.05). Endotoxin (lipopolysaccharide (LPS)), used as a standardized stimulus to define brain-specific inflammation-induced change, amplified pericyteinduced enhanced release of the tPA inhibitor plasminogen activator inhibitor-1 (PAI-1); the latter was released by endothelial cells first cocultured with pericytes and then incubated with LPS in the absence of pericytes. Pericytes (in contrast to endothelial cells and astrocytes) were found to be the principal in vitro source of the serpin protease nexin-1 (PN-1), known to have primarily antithrombin effects. These in vitro findings suggest that pericytes negatively regulate brain endothelial cell fibrinolysis, while pericyte expression of PN-1 may provide endogenous anticoagulant activity.
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The purpose of this study was to define the hemostatic regulatory role of human brain pericytes. We used blood–brain barrier models consisting of human pericytes grown on transwell membrane inserts and cocultured with human brain microvascular endothelial cells (HBEC), or pericytes grown in direct contact with HBEC. When grown in cocultures in which pericytes were physically separated from endothelial cells, pericytes induced significant changes in endothelial tissue plasminogen activator (tPA) messenger ribonucleic acid (mRNA) and protein: tPA mRNA level was decreased in pericyte cocultures (52% ± 25% of monocultures, P &lt; 0.05) and tPA protein level was decreased (66% ± 23% of monocultures, P &lt; 0.05). Pericyte effects on endothelial fibrinolysis were enhanced when the two cell types were cocultured in direct contact, with tPA protein reduced in cocultures compared with monocultures (25% ± 15% of monocultures, P &lt; 0.05). 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Endotoxin (lipopolysaccharide (LPS)), used as a standardized stimulus to define brain-specific inflammation-induced change, amplified pericyteinduced enhanced release of the tPA inhibitor plasminogen activator inhibitor-1 (PAI-1); the latter was released by endothelial cells first cocultured with pericytes and then incubated with LPS in the absence of pericytes. Pericytes (in contrast to endothelial cells and astrocytes) were found to be the principal in vitro source of the serpin protease nexin-1 (PN-1), known to have primarily antithrombin effects. 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Endotoxin (lipopolysaccharide (LPS)), used as a standardized stimulus to define brain-specific inflammation-induced change, amplified pericyteinduced enhanced release of the tPA inhibitor plasminogen activator inhibitor-1 (PAI-1); the latter was released by endothelial cells first cocultured with pericytes and then incubated with LPS in the absence of pericytes. Pericytes (in contrast to endothelial cells and astrocytes) were found to be the principal in vitro source of the serpin protease nexin-1 (PN-1), known to have primarily antithrombin effects. These in vitro findings suggest that pericytes negatively regulate brain endothelial cell fibrinolysis, while pericyte expression of PN-1 may provide endogenous anticoagulant activity.</abstract><cop>London, England</cop><pub>SAGE Publications</pub><pmid>16015279</pmid><doi>10.1038/sj.jcbfm.9600181</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Amyloid beta-Protein Precursor - genetics
Amyloid beta-Protein Precursor - metabolism
Biological and medical sciences
Brain - blood supply
Brain - metabolism
Cells, Cultured
Cerebral circulation. Blood-brain barrier. Choroid plexus. Cerebrospinal fluid. Circumventricular organ. Meninges
Coculture Techniques - methods
Endothelial Cells - cytology
Endothelial Cells - physiology
Fibrinolysis - physiology
Fundamental and applied biological sciences. Psychology
Hemostasis - physiology
Humans
Investigative techniques, diagnostic techniques (general aspects)
Lipopolysaccharides - pharmacology
Medical sciences
Nervous system
Neurology
Pericytes - cytology
Pericytes - enzymology
Pericytes - physiology
Plasminogen Activator Inhibitor 1 - metabolism
Protease Nexins
Receptors, Cell Surface - genetics
Receptors, Cell Surface - metabolism
RNA, Messenger - antagonists & inhibitors
RNA, Messenger - genetics
RNA, Messenger - metabolism
Serpin E2
Serpins - genetics
Serpins - metabolism
Tissue Plasminogen Activator - antagonists & inhibitors
Tissue Plasminogen Activator - genetics
Tissue Plasminogen Activator - metabolism
Ultrasonic investigative techniques
Vascular diseases and vascular malformations of the nervous system
Vertebrates: nervous system and sense organs
title Brain endothelial hemostasis regulation by pericytes
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