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Membrane type-matrix metalloproteinases in idiopathic pulmonary fibrosis

Jorge García-Alvarez1, Remedios Ramirez, Clara L Sampieri

  • 1Facultad de Ciencias, Universidad Nacional Autónoma de México.

Sarcoidosis, Vasculitis, and Diffuse Lung Diseases : Official Journal of WASOG
|August 29, 2006
PubMed
Abstract

Insights

Membrane-type matrix metalloproteinases (MT-MMPs) are present in idiopathic pulmonary fibrosis (IPF) lungs, particularly MT3-MMP, which is upregulated by TGF-beta1 in fibroblasts. These findings suggest MT-MMPs play a role in IPF pathogenesis.

Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Biochemistry

Background:

  • Idiopathic pulmonary fibrosis (IPF) involves fibroblast proliferation and extracellular matrix deposition.
  • Matrix metalloproteinase-2 (MMP2) is elevated in IPF lungs, and membrane-type MMPs (MT-MMPs) are involved in its activation.
  • The role of MT-MMPs in IPF has not been previously investigated.

Purpose of the Study:

  • To investigate the expression and localization of MT-MMPs in IPF lungs.
  • To determine the effect of TGF-beta1 and IFN-gamma on MT-MMP expression in lung fibroblasts.

Main Methods:

  • Real-time PCR and immunohistochemistry were used to analyze MT1, MT2, MT3, and MT5-MMP expression in IPF and normal lung tissues.
  • MMP-2 localization and activity in bronchoalveolar lavage (BAL) fluids were assessed.
  • Lung fibroblasts were stimulated with TGF-beta1 and IFN-gamma, and MT-MMP expression was analyzed by real-time PCR.

Main Results:

  • MT1-MMP showed the highest expression, followed by MT2- and MT5-MMP, and moderate MT3-MMP expression in IPF lungs.
  • MT-MMPs were localized in various lung cells, including epithelial cells and fibroblasts in fibroblastic foci.
  • TGF-beta1 significantly upregulated MT3-MMP in lung fibroblasts, an effect partially inhibited by p38 MAP kinase inhibitors.

Conclusions:

  • MT-MMPs are expressed in IPF lungs, co-localizing with MMP2 in epithelial cells and fibroblasts.
  • MT3-MMP, found in fibroblastic foci, is upregulated by TGF-beta1, suggesting a role in the fibrotic process.
  • MT-MMPs may be key contributors to the aberrant lung remodeling observed in IPF.

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