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Matrix Metalloproteinase-9 (279R/Q) Polymorphism is Associated with Clinical Severity and Airflow Limitation in Tunisian Patients with Chronic Obstructive Pulmonary Disease

Overview
Journal Mol Diagn Ther
Date 2015 Aug 26
PMID 26303146
Citations 4
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Abstract

Background: The aim of this study was to investigate the role of matrix metalloproteinase-9 (MMP-9) C-1562T and 279R/Q (836G>A) polymorphisms in the development of chronic obstructive pulmonary disease (COPD) in Tunisians and to determine their impact on disease progression and airflow obstruction.

Methods: Pulmonary functional tests were evaluated by body plethysmography. MMP-9 genotypes were determined in patients with COPD (n = 138) and healthy controls (n = 216) by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Serum MMP-9 and interleukin-6 (IL-6) levels were determined by enzyme-linked immunosorbent assays (ELISA) and activity of MMP-9 was evaluated by gelatin zymography.

Results: No significant association was found between genetic variations in MMP-9 C-1562T and 279R/Q polymorphisms and the risk of development of COPD. However, a significant correlation was retrieved between the 279 R/Q polymorphism and disease severity (P = 0.02). In addition, homozygous Q (A) genotype was associated with a poorer lung function with a fall in forced expiratory volume in 1 s (FEV1) (%) and forced vital capacity (FVC%) among COPD patients compared with both AG and GG individuals (52.06 ± 19.6 vs. 59.08 ± 17.19, P = 0.03 and 72.41 ± 21.42 vs. 82.98 ± 16.48, P = 0.002, respectively). Using ELISA, a higher level of MMP-9 was found in patients with the CT genotype (P = 0.03), while no significant impact of the 279R/Q polymorphism was observed (P = 0.48). In contrast, by using zymography gel analysis, MMP-9 activity was enhanced in individuals carrying the R(G) allele in comparison with those homozygous for the Q(A) variant (P = 0.02).

Conclusion: Our results support a role for the 279R/Q polymorphism in physiological alterations that may affect progression and severity of COPD. These findings could be related to the decreased activity of MMP-9 among COPD patients carrying the 279Q variant.

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