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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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Related Experiment Video

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MMP-9 affects dural cell composition and granulocyte accumulation during neuroinflammation.

Sheng-Hsiang Shen1, Hanna Gerwien2, Miriam Burmeister2

  • 1Department of Neurology, Medical Faculty, University Hospital Muenster, Münster, Germany.

Frontiers in Immunology
|December 29, 2025
PubMed
Summary
This summary is machine-generated.

Matrix metalloproteinase-9 (MMP-9) plays a key role in regulating dura mater immunity during neuroinflammation. While its absence delays disease onset, it increases neutrophil accumulation and inflammation at the central nervous system border.

Keywords:
dura materexperimental autoimmune encephalomyelitis (EAE)matrix metalloproteinase-9 (MMP-9)meningeal immunityneuroinflammationneutrophil granulocytessingle-nucleus RNA sequencing (snRNA-seq)

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Area of Science:

  • Neuroimmunology
  • Mesenchymal Stem Cell Biology
  • Blood-Brain Barrier Research

Background:

  • Matrix metalloproteinases (MMPs), specifically MMP-2 and MMP-9, are known to influence inflammatory processes at the blood-brain barrier (BBB).
  • However, their precise roles and presence within the dura mater, a critical interface during neuroinflammation, remain largely uncharacterized.

Purpose of the Study:

  • To investigate the contribution of MMP-2 and MMP-9 to immune regulation within the dura mater during experimental autoimmune encephalomyelitis (EAE), a model of neuroinflammation.
  • To define the expression, cellular sources, and functional impact of gelatinases in the dura mater.

Main Methods:

  • Analysis of dura mater from naive and EAE-induced wild-type (WT) and MMP-9 knockout (Mmp9-/-) mice.
  • Techniques included immunofluorescence, gelatin zymography, flow cytometry, and single-nucleus RNA sequencing (snRNA-seq).

Main Results:

  • MMP-2 and MMP-9 were detected in naive dura, with MMP-9 significantly upregulated during EAE.
  • Mmp9-/- mice exhibited delayed EAE onset but more severe disease.
  • MMP-9 deficiency altered endothelial cell gene expression and increased neutrophil populations in the dura mater.

Conclusions:

  • MMP-9 is a key regulator of immune cell dynamics and activation in the dura mater during neuroinflammation.
  • Despite delaying disease onset, MMP-9 deficiency exacerbates neutrophil infiltration and inflammation, suggesting a potentially protective role for MMP-9 in this CNS border tissue.