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Sputum matrix metalloproteases: comparison between chronic obstructive pulmonary disease and asthma

S V Culpitt1, D F Rogers, S L Traves

  • 1Department of Thoracic Medicine, National Heart and Lung Institute, Imperial College London, Dovehouse Street, London SW3 6LY, UK.

Respiratory Medicine
|May 10, 2005
PubMed

Insights

Matrix metalloproteases (MMPs) differ in chronic obstructive pulmonary disease (COPD) airways compared to asthma. COPD airways show higher MMP-1, -8, -9 levels and activity, potentially marking distinct disease paths.

Area of Science:

  • Pulmonary Medicine
  • Biochemistry

Background:

  • Asthma and COPD are distinct respiratory diseases with differing inflammatory pathways.
  • Matrix metalloproteases (MMPs) play a role in the pathology of both asthma and COPD.
  • Distinct MMP profiles in airways may reflect the unique pathophysiology of each condition.

Purpose of the Study:

  • To compare matrix metalloprotease (MMP) profiles in induced sputum from non-smokers, smokers, COPD patients, and asthma patients.
  • To investigate the relationship between MMP levels, lung function (FEV1), and sputum neutrophil percentage in COPD.

Main Methods:

  • Induced sputum was collected from four groups: non-smokers, non-symptomatic smokers, COPD patients, and asthma patients (n=15 per group).
  • Levels of MMP-1, -2, -3, -8, -9, and TIMP-1 were quantified using ELISA.
  • Gelatinase activity was assessed by zymography.
  • Spirometry (FEV1) and sputum differential cell counts were performed.

Main Results:

  • COPD patients exhibited significantly higher sputum levels of MMP-1, -8, and -9 (2-7 fold increase) compared to other groups.
  • MMP-9 activity was markedly elevated in COPD sputum (3-12 fold increase).
  • TIMP-1 levels were 3-fold higher in COPD patients than asthmatics or controls, but similar to smokers.
  • FEV1 negatively correlated with MMP-1, -8, -9, MMP-9 activity, and TIMP-1.
  • Sputum neutrophil percentage positively correlated with MMP-1, -8, -9, TIMP-1, and MMP-9 activity.

Conclusions:

  • The MMP profile in COPD airways is distinct from that observed in asthma and healthy smokers.
  • Elevated MMPs and TIMP-1 in COPD sputum may indicate specific pathophysiological mechanisms.
  • These MMP profiles could serve as biomarkers for differentiating the underlying pathologies of COPD and asthma.

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