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Published on: February 21, 2011

Lung matrix metalloproteinase-9 correlates with cigarette smoking and obstruction of airflow

Min Jong Kang1, Yeon-Mok Oh, Jae Cheol Lee

  • 1Department of Internal Medicine, Hallym University Sacred Heart Hospital, College of Medicine, Hallym University, Anyang, Korea.

Journal of Korean Medical Science
|December 17, 2003
PubMed

Insights

Matrix metalloproteinases (MMPs), specifically MMP-9, increase with cigarette smoking and correlate with reduced lung function (FEV1). This suggests MMP-9 plays a role in COPD pathogenesis, particularly in smokers.

Area of Science:

  • Pulmonary Medicine
  • Biochemistry
  • Respiratory Research

Background:

  • Cigarette smoking is a primary risk factor for Chronic Obstructive Pulmonary Disease (COPD).
  • An imbalance in Matrix Metalloproteinases (MMPs) and Tissue Inhibitors of MMPs (TIMPs) is implicated in COPD pathogenesis.
  • MMP-9 and its inhibitor TIMP-1 are key players in tissue remodeling and inflammation.

Purpose of the Study:

  • To investigate the association between MMP expression, MMP-9/TIMP-1 imbalance, smoking amount, and airflow obstruction (FEV1) in lung parenchyma.
  • To determine the specific MMPs involved in the lung tissue of smokers versus non-smokers.

Main Methods:

  • Zymographic analysis to identify MMP profiles in lung parenchyma.
  • Enzyme immunoassay to quantify MMP-9 and TIMP-1 concentrations.
  • Correlation analysis to link MMP-9/TIMP-1 levels with smoking history and FEV1 values.

Main Results:

  • Zymography revealed MMP-9 as the predominant gelatinolytic enzyme in smokers' lung parenchyma.
  • MMP-9 concentrations and MMP-9/TIMP-1 ratios significantly correlated with the amount of cigarette smoking.
  • MMP-9 concentrations showed an inverse correlation with FEV1, indicating reduced airflow obstruction.

Conclusions:

  • MMP-9 expression in human lung parenchyma is significantly associated with cigarette smoking.
  • Elevated MMP-9 levels and altered MMP-9/TIMP-1 ratios are linked to airflow obstruction in COPD patients.
  • MMP-9 is suggested to be a key mediator in the pathogenesis of COPD induced by cigarette smoke.

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