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Genotypes in matrix metalloproteinase 9 are a risk factor for COPD
Yohannes Tesfaigzi1, Orrin B Myers, Christine A Stidley
1Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive, SE, Albuquerque, NM 87108, USA. ytesfaig@lrri.org
International Journal of Chronic Obstructive Pulmonary Disease
|December 1, 2007
Summary
Genetic variants in the matrix metalloproteinase-9 (MMP-9) gene are linked to chronic obstructive pulmonary disease (COPD) risk in male smokers. Specifically, the MMP-9 279Arg variant increases COPD risk, but not pulmonary function decline.
Area of Science:
- Genetics
- Pulmonary Medicine
- Molecular Biology
Background:
- Matrix metalloproteinases (MMPs) are implicated in the pathogenesis of chronic obstructive pulmonary disease (COPD).
- Genetic variations in MMP genes may influence susceptibility to COPD.
- MMP-9, in particular, has been studied for its role in lung tissue remodeling.
Purpose of the Study:
- To investigate the association between polymorphisms in MMP-1, MMP-2, and MMP-9 genes and COPD.
- To examine the role of specific MMP-9 variants, including promoter polymorphisms and the Gln279Arg variant, in COPD development.
- To assess the relationship between these genetic variants and the decline of pulmonary function.
Main Methods:
- A candidate gene association study was performed on 385 male veterans with a significant smoking history (>20 pack-years).
- COPD status was determined using spirometry.
- Four promoter polymorphisms in MMP-1, MMP-2, and MMP-9, and the MMP-9 Gln279Arg exon 6 polymorphism were analyzed.
- Haplotype analysis was conducted for MMP-9 variants.
Main Results:
- The MMP-9 279Arg variant was significantly more prevalent in participants with COPD.
- Homozygosity for the 279Arg variant was associated with a threefold increased risk of developing COPD.
- A specific MMP-9 haplotype (comprising 249Arg and CA promoter polymorphism) was also associated with COPD risk.
- No significant association was found between the studied MMP-9 polymorphisms and the decline in pulmonary function.
Conclusions:
- Genetic variants within the MMP-9 gene are associated with the risk of developing COPD in this cohort of male smokers.
- The MMP-9 279Arg variant appears to be a key genetic factor contributing to COPD susceptibility.
- Further research is warranted to elucidate the precise mechanisms linking MMP-9 variants to COPD pathogenesis.
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