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Isolation of Primary Murine Brain Microvascular Endothelial Cells
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Isolation of Primary Murine Brain Microvascular Endothelial Cells

Published on: November 14, 2014

Production of MMPs in human cerebral endothelial cells and their role in shedding adhesion molecules

V Hummel1, B A Kallmann, S Wagner

  • 1Department of Neurology, Julius-Maximilians-Universität, Würzburg, Germany.

Journal of Neuropathology and Experimental Neurology
|April 18, 2001
PubMed

Insights

Matrix metalloproteinases (MMPs) are key enzymes in central nervous system inflammation. This study shows TNF-alpha upregulates MMP-3 in brain endothelial cells, contributing to soluble VCAM-1 release at the blood-brain barrier.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Immunology

Background:

  • Matrix metalloproteinases (MMPs) are implicated in central nervous system (CNS) inflammatory diseases.
  • MMPs contribute to blood-brain barrier (BBB) disruption and myelin damage.
  • The role of MMPs in CNS inflammation requires further elucidation.

Purpose of the Study:

  • To investigate the effect of tumor necrosis factor-alpha (TNF-alpha) on MMP expression and activation in human cerebral endothelial cells (HCEC).
  • To determine the role of MMPs in the release of soluble adhesion molecules, specifically soluble VCAM-1 (sVCAM-1), from HCEC.

Main Methods:

  • HCEC were stimulated with TNF-alpha.
  • Messenger RNA (mRNA) and protein levels of MMPs (MMP-2, MMP-3, MMP-9, MMP-12) were analyzed.
  • The effect of MMP inhibitors (marimastat, aprotinin, leupeptin) on TNF-alpha-induced sVCAM-1 release was assessed.
  • Western blotting was used to confirm sVCAM-1 shedding.

Main Results:

  • HCEC constitutively express MMP-2 and MMP-3 mRNA.
  • TNF-alpha stimulation upregulated MMP-3 mRNA and protein levels.
  • MMP-9 and MMP-12 mRNA were detected only under inflammatory conditions.
  • Marimastat, but not other protease inhibitors, blocked TNF-alpha-mediated sVCAM-1 release.
  • Western blots confirmed the release of VCAM-1.

Conclusions:

  • MMPs, particularly MMP-3, are upregulated by TNF-alpha in HCEC.
  • MMPs produced by HCEC contribute to the shedding of soluble adhesion molecules like sVCAM-1 at the BBB.
  • These findings highlight the role of MMPs in inflammatory processes at the blood-brain barrier.

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