The aim of the current study was to explore the possible association of the polymorphism of C(-735)T in MMP-2 with the vulnerable plaque risk in ultrasound-confirmed carotid atherosclerosis cases. Serum MMP-2 levels were measured to investigate the relationship between the MMP-2 level and the genetic variability. The MMP-2 polymorphism was detected by PCR-RFLP in the 243 cases with stable plaque and 221 cases with vulnerable plaque. Serum MMP-2 levels were measured with ELISA. The results showed that MMP-2 was significantly higher in the cases with vulnerable plaque than in the cases with stable plaque. A statistical difference was found between the genotype distributions in the vulnerable plaque cases and that in the stable cases. T-allele frequency was also found to be over-represented in the stable plaque cases than in the vulnerable plaque cases, which might partially explain the observed difference in the serum MMP-2 levels in the different plaque cases. The current results also suggested that MMP-2 was a risk factor in the cases with vulnerable plaques, whereas TT genotype and T allele might be protective factors in the cases with vulnerable plaques.
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