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Bronchoalveolar matrix metalloproteinase 9 relates to restrictive lung function impairment in systemic sclerosis

Grethe Neumann Andersen1, Kenneth Nilsson, Jamshid Pourazar

  • 1Department of Rheumatology, University Hospital of Umeå, Umeå, Sweden.

Respiratory Medicine
|July 24, 2007
PubMed

Insights

Matrix metalloproteinase 9 (MMP-9) is elevated in systemic sclerosis patients with interstitial lung disease (ILD), suggesting its role in lung fibrosis and potential as a therapeutic target.

Area of Science:

  • Pulmonary Medicine
  • Rheumatology
  • Biochemistry

Background:

  • Systemic sclerosis (SSc) commonly involves interstitial lung disease (ILD), often progressing to lung fibrosis.
  • Matrix metalloproteinase 9 (MMP-9) and its inhibitor, tissue inhibitor of matrix metalloproteinase 1 (TIMP-1), are implicated in tissue remodeling.

Purpose of the Study:

  • To investigate the association of MMP-9 and TIMP-1 with lung remodeling in SSc-ILD.
  • To determine if MMP-9 and TIMP-1 levels correlate with disease severity in SSc-ILD.

Main Methods:

  • Measurement of total MMP-9, pro-MMP-9, and TIMP-1 in bronchoalveolar lavage (BAL) fluid.
  • Comparison of levels between SSc patients with ILD, SSc patients without ILD, and healthy controls.
  • Correlation analysis with total lung capacity (TLC).

Main Results:

  • Significantly elevated total and pro-MMP-9 levels in SSc-ILD patients compared to other groups.
  • Higher active MMP-9 levels in SSc-ILD patients.
  • Elevated TIMP-1 levels in both SSc patient groups.
  • Inverse association between MMP-9/TIMP-1 levels/ratios and TLC.

Conclusions:

  • MMP-9 appears to play a significant role in the pathogenesis of lung remodeling and fibrosis in SSc-ILD.
  • MMP-9 may represent a potential therapeutic target for SSc-ILD.
  • TIMP-1 is also elevated, suggesting a complex interplay in disease progression.

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