Cited by 298Angiogenesis and VEGF in CancerBarrier Structure and Function StudiesMesenchymal stem cell research

Angiopoietin1/Tie2 and VEGF/Flk1 induced by MSC treatment amplifies angiogenesis and vascular stabilization after stroke

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Zacharek, Alex, Chen, Jieli, Li, Ang, Cui, Xu, Li, Yi, Roberts, Cynthia, Feng, Yifan, Gao, Qi +1 more·2007·Journal of Cerebral Blood Flow & Metabolism

Abstract

Bone marrow stromal cells (MSCs) increase vascular endothelial growth factor (VEGF) expression and promote angiogenesis after stroke. Angiopoietin-1 (Ang1) and its receptor Tie2 mediate vascular integrity and angiogenesis as does VEGF and its receptors. In this study, we tested whether MSC treatment of stroke increases Ang1/Tie2 expression, and whether Ang1/Tie2 with VEGF / vascular endothelial growth factor receptor 2 (VEGFR2) (Flk1), in combination, induced by MSCs enhances angiogenesis and vascular integrity. Male Wistar rats were subjected to middle cerebral artery occlusion (MCAo) and treated with or without MSCs. Marrow stromal cell treatment significantly decreased blood—brain barrier (BBB) leakage and increased Ang1, Tie2, and occludin (a tight junction protein) expression in the ischemic border compared with MCAo control. To further test the mechanisms of MSC-induced angiogenesis and vascular stabilization, cocultures of MSCs with mouse brain endothelial cells (MBECs) or astrocytes were performed. Supernatant derived from MSCs cocultured with MBECs significantly increased MBEC expression of Ang1/Tie2 and Flk1 compared with MBEC alone. Marrow stromal cells cocultured with astrocytes also significantly increased astrocyte VEGF and Ang1/Tie2 expression compared with astrocyte culture alone. Conditioned media from MSCs alone, and media from cocultures of MSCs with astrocytes or MBECs, all significantly increased capillary tube-like formation of MBEC compared with control Dulbecco's modified Eagle's medium media. Inhibition of Flk1 and/or Ang1 significantly decreased MSC-induced MBEC tube formation. Knockdown of Tie2 expression in MBECs significantly inhibited MSC-induced tube formation. Our data indicate MSC treatment of stroke promotes angiogenesis and vascular stabilization, which is at least partially mediated by VEGF/Flk1 and Ang1/Tie2.

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Crossref · 10.1038/sj.jcbfm.9600475

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  • After focal cerebral ischaemia, astrocytes de novo express neurotrophic factors such as GDNF and VEGF, and serine proteases such as tPA, in parallel with downregulation of growth-repulsive proteoglycans.

    “Subsequent to focal cerebral ischaemia, and in parallel to the downregulation of growth-repulsive proteoglycans, astrocytes de novo express neurotrophic factors, such as glial-cell-line-derived neurotrophic factor (GDNF)66 and VEGF,67 and serine proteases, namely tissue plasminogen activator (tPA).68”
  • Despite robust evidence for specific time windows in which neuronal plasticity and angiogenesis are most active, neurorestorative treatments were still successful in animals once brain remodelling was induced months after stroke.

    “Despite the robust evidence for specific time windows in which neuronal plasticity and angiogenesis are most active,64,66,67 neurorestorative treatments were still successful in animals once brain remodelling was induced months after the stroke.18,20”

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Authors
Zacharek, A., Chen, J., Li, A., Cui, X., Li, Y., Roberts, C., Feng, Y., Gao, Q., & Chopp, M.
Affiliations
Henry Ford Health (US)
Corresponding author
Chopp, Michael
Venue
Journal of Cerebral Blood Flow & Metabolism
Published
2007-10
Volume
27
Issue
10
Pages
1684-1691
ISSN
  • 0271-678X (ISSN-L)
  • 1559-7016
OpenAlex
W1974547403
Cited by
297
References
36
Citations by year
2026: 7 · 2025: 11 · 2024: 15 · 2023: 10 · 2022: 8 · 2021: 23 · 2020: 13 · 2019: 13 · 2018: 13 · 2017: 27 · 2016: 20 · 2015: 18 · 2014: 21 · 2013: 16 · 2012: 22
FWCI
5.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Cerebral Blood Flow & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Neurological Disorders and Stroke (R01NS047682, P01NS23393, P01NS023393)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
mesenchymal stem cells, stroke, angiogenesis, angiopoietin-1, Tie2, vascular endothelial growth factor, Flk-1, vascular stabilization, blood-brain barrier disruption, occludin, tight junctions, brain endothelial cells, astrocytes, middle cerebral artery occlusion, capillary tube formation, cell therapy
MeSH terms
Animals, Astrocytes, Blood-Brain Barrier, Bone Marrow Cells, Cells, Cultured, Gene Expression Regulation, Male, Neovascularization, Pathologic, Stromal Cells, Rats, Wistar, Mice, Knockout, Coculture Techniques, Stroke, Vascular Endothelial Growth Factor Receptor-2, Vascular Endothelial Growth Factor A, Angiopoietin-1, Endothelial Cells, Receptor, TIE-2, Mice, Rats

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