Elevated MMP-9 Is Associated With Accelerated Lung Function Decline and COPD Development: A Prospective Cohort Study...

Area of Science:

• Pulmonary Medicine
• Biochemistry
• Genetics

Background:

• Protease/antiprotease imbalance due to inflammation is implicated in COPD pathogenesis.
• Matrix metalloproteinase-9 (MMP-9) is a key enzyme potentially involved in COPD development.

Purpose of the Study:

• To investigate the association between MMP-9 levels and respiratory health outcomes.
• To evaluate the potential causal role of MMP-9 in COPD development and lung function decline.

Main Methods:

• A prospective cohort study assessed circulating MMP-9 in relation to respiratory symptoms, spirometry, CT scans, and exacerbations over 2 years.
• A two-sample Mendelian randomization (MR) study examined the causal effect of genetically predicted MMP-9 on lung function.

Main Results:

• Elevated plasma MMP-9 was associated with chronic respiratory symptoms, emphysema, and air trapping.
• Higher MMP-9 levels predicted accelerated decline in FEV1 and FVC, and increased exacerbation incidence.
• Mendelian randomization analysis supported a causal link between genetically predicted MMP-9 and reduced lung function (FEV1, FVC).

Conclusions:

• Longitudinal cohort and MR studies suggest MMP-9 plays a causative role in COPD development.
• MMP-9 is a potential therapeutic target for mitigating lung function decline and COPD progression.