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Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays
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Mast cell-fibroblast interactions induce matrix metalloproteinase-9 release from fibroblasts: role for IgE-mediated

Melanie Abel1, Harissios Vliagoftis

  • 1Pulmonary Research Group, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|February 23, 2008
PubMed

Insights

Mast cell and fibroblast interactions promote tissue remodeling by releasing matrix metalloproteinases (MMP-9). This process is amplified by IgE, suggesting a role in allergic conditions.

Area of Science:

  • Immunology
  • Cell Biology
  • Tissue Remodeling

Background:

  • Mast cells adhere to fibroblasts, but the biological significance of this interaction is not fully understood.
  • Tissue remodeling is a complex process involving the degradation and synthesis of extracellular matrix components.
  • Matrix metalloproteinases (MMPs) are key enzymes involved in tissue remodeling.

Purpose of the Study:

  • To investigate the biological effects of mast cell-fibroblast adhesion on tissue remodeling.
  • To determine the role of mast cell-fibroblast interactions in the release of matrix metalloproteinases (MMP-9).
  • To explore the influence of IgE and tumor necrosis factor (TNF) in this process.

Main Methods:

  • Co-culturing murine bone marrow-derived mast cells (BMCMC) with NIH-3T3 or murine lung fibroblasts (CCL-206).
  • Analyzing supernatants for MMP-9 release using gelatin zymography.
  • Investigating the dependence of MMP-9 release on TNF, IgE, and adhesive interactions.
  • Examining the role of p44/42 MAPK signaling pathway.
  • Assessing MMP-9 content in mouse ear tissue after IgE injection.

Main Results:

  • Co-culturing BMCMC with fibroblasts significantly increased MMP-9 release from fibroblasts.
  • The presence of IgE further enhanced MMP-9 release, dependent on TNF and cell adhesion.
  • MMP-9 release and up-regulation were dependent on the p44/42 signaling pathway.
  • IgE injection in mice increased ear tissue MMP-9 content, even without antigen exposure.

Conclusions:

  • Mast cell-fibroblast interactions induce the release of MMP-9, a protease crucial for tissue remodeling.
  • IgE-mediated mast cell activation potentiates MMP-9 release, highlighting a potential mechanism in atopic conditions.
  • These findings suggest that mast cell-fibroblast interactions contribute to pathological tissue remodeling in allergic diseases.

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