title: Genetic polymorphism in matrix metalloproteinase-9 and the susceptibility to chronic obstructive pulmonary disease in Han population of south China.
abstract: BACKGROUND
  There are many candidate genes for chronic obstructive pulmonary disease (COPD). Matrix metalloproteinase-9 (MMP-9) plays an essential role in tissue remodeling and repair associated with development of COPD. In this study we investigated the correlation between MMP-9 gene polymorphism and COPD susceptibility in the Han population of South China.
  
  
  METHODS
  We examined the frequency of polymorphic genotypes of the MMP-9 promoter (-1562C/T) in 100 COPD patients and 98 healthy smokers by restriction fragment length polymorphism.
  
  
  RESULTS
  The frequencies of polymorphic genotypes in promoters of MMP-9 were C/C 86%, C/T 14% in COPD group; and C/C 98%, C/T 2% in the control group. There were significant differences between the two groups (P < 0.01). The allele frequencies were also significantly different between the COPD group and the control group (C allele frequency: 93% vs 99%, T allele frequency: 7% vs 1%, P < 0.05 respectively).
  
  
  CONCLUSIONS
  The genetic polymorphism in promoters of MMP-9 gene is associated with the susceptibility to COPD in the Han population of South China.
authors.affiliation: Department of Pulmonary Medicine, Ruijin Hospital, Shanghai Second Medical University, Shanghai 200025, China. doctor_zhou_99@yahoo.com.cn
authors.forename: Min
authors.initials: M
authors.lastname: Zhou
authors.forename: Shao-guang
authors.initials: SG
authors.lastname: Huang
authors.forename: Huan-ying
authors.initials: HY
authors.lastname: Wan
authors.forename: Biao
authors.initials: B
authors.lastname: Li
authors.forename: Wei-wu
authors.initials: WW
authors.lastname: Deng
authors.forename: Min
authors.initials: M
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D002681:China / Q000208:ethnology; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000235:genetics*; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic; D029424:Pulmonary Disease, Chronic Obstructive / Q000235:genetics*
chemical_list: D020780:Matrix Metalloproteinase 9