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Matrix metalloproteinases MMP-7, MMP-9 and their tissue inhibitor TIMP-1: expression in chronic sinusitis vs nasal

J B Watelet1, C Bachert, C Claeys

  • 1Department of Otorhinolaryngology, University Hospital Ghent, Ghent, Belgium.

Allergy
|December 17, 2003
PubMed
Abstract

Insights

Chronic sinusitis (CS) and nasal polyps (NP) exhibit distinct patterns of matrix metalloproteinase-7 (MMP-7), MMP-9, and tissue inhibitor of metalloproteinase-1 (TIMP-1) expression. These differences in enzyme regulation are linked to the tissue remodeling observed in each condition.

Area of Science:

  • Biochemistry
  • Pathology
  • Otorhinolaryngology

Background:

  • Nasal polyps (NP) feature pseudocyst formation, unlike the edema seen in chronic sinusitis (CS).
  • Matrix metalloproteinases (MMPs) degrade extracellular matrix, and their expression may differ between CS and NP.
  • Tissue inhibitors of metalloproteinases (TIMPs) regulate MMP activity.

Purpose of the Study:

  • To compare the expression of MMP-7, MMP-9, and TIMP-1 proteins in NP and CS tissues versus normal nasal mucosa.
  • To investigate the role of MMPs and TIMPs in the distinct histological features of NP and CS.

Main Methods:

  • Immunohistochemistry and enzyme-linked immunosorbent assay (ELISA) were used to analyze nasal tissue samples.
  • Samples were obtained from control subjects (n=10), NP patients (n=8), and CS patients (n=10).

Main Results:

  • MMP-9 and MMP-7 staining was observed in blood vessels in NP tissues.
  • Increased MMP-9-positive inflammatory cells were found in NP pseudocysts.
  • MMP-9 and TIMP-1 protein concentrations were significantly elevated in both CS and NP compared to controls.
  • MMP-7 protein concentration was significantly higher in NP compared to controls and CS.

Conclusions:

  • Chronic sinusitis and nasal polyps display unique expression patterns for MMP-7, MMP-9, and TIMP-1.
  • Differential regulation of these enzymes likely contributes to the distinct tissue remodeling observed in CS and NP.

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