Background: Circulating concentrations of matrix metalloproteinase 9 (MMP-9) are associated with cardiovascular disease mortality in patients with coronary artery disease. We investigated the determinants of MMP-9 concentrations by analyzing MMP-9 genotypes and risk factors for cardiovascular disease.
Methods: A total of 596 individuals were recruited for this study. Six single nucleotide polymorphisms (SNP) with coverage of the MMP-9 gene region were analyzed; and two genotypes, rs3918242-TT and rs2274756-AA, which were in nearly complete linkage disequilibrium, were associated with higher MMP-9 values (p=0.007 and p=0.008, respectively). In age- and gender-adjusted regression models, MMP-9 concentrations were positively associated with the homeostasis model assessment of insulin resistance (HOMA-IR) index and triglyceride concentrations, fasting serum insulin, fasting plasma glucose, C-reactive protein, fibrinogen, and serum amyloid A. By multivariate analysis, rs2274756 genotypes, age, smoking status, fibrinogen and fasting plasma glucose concentrations were all independently associated with MMP-9 (p=0.007, p=0.033, p=0.003, p=0.013, and p=0.012, respectively).
Conclusions: The rs2274756-AA and rs3918242-TT genotypes, younger age, current smoking status and increased fasting plasma glucose, and fibrinogen concentrations were independently associated with high serum MMP-9 concentrations in Taiwanese individuals.
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