RESUMO
Objective To investigate the relationship between acute cerebral infarction(CI)and matrix metalloproteinase-9(MMP-9)serum level and polymorphism(C-1562T)in Han population.Methods One hundred and one patients with acute CI from the department of neurology of Taizhou Hospital were included and 114 healthy persons were selected from physical examination as the control group.Serum MMP-9 level was measured by enzyme-linked immunosorbent assay(ELISA).At the same time.genotype was determined by polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP)for the common C-1562T functional promoter polymorphism of the MMP-9 gene.The serum MMP-9 level and genotype frequencies of the MMP-9 gene between the patients and the control group were analyzed.Results The genotype frequencies of the MMP-9 gene C-1562T polymorphism of the two groups were in Hardy-Weinberg equilibrium.The results of individual polymorphisms analysis showed that the frequencies of CT and TT genotypes in the C-1562T polyporphismin were of no significant difference between the patients group with CI(13.9%)and the control group(13.2%).The frequencies of-1562T allele was of no statistical difference between the CI group(6.9%)and the control group(7.5%).But serum levels of MMP-9 in CI patients group((138.9±121.8)ng/ml)were significantly higher than in the control group((18.4±4.6)ng/ml,t=9.93,P=0.00).Conclusions Serum level of MMP-9 obviously is increased after ischemic stroke in 48 hours.But genetic polymorphism in MMP-9 promoter(C-1562T)has no definite relationship with MMP-9 genetic expression and CI in the Han population of China.Therefore,the relationship between genetic polymorphism in MMP-9 promoter(C-1562T)and ischemic stroke needs further investigation.