title: Analysis of functional polymorphisms of metalloproteinase genes in persons with vascular dementia and Alzheimer's disease.
abstract: BACKGROUND
  Vascular dementia (VAD) and Alzheimer's disease (AD) may share common neuropathological mechanisms. Matrix metalloproteinases (MMPs) may induce destruction of the extracellular matrix, neuronal dysfunction, and death. Increased expression of these molecules has been found in a number of neurological diseases, including cerebral ischemia and AD. Expression and activity of MMPs may be genetically influenced by common polymorphisms in the promoter regions of the corresponding genes. The purpose of this study was to evaluate whether functional polymorphisms of MMP genes are associated with dementia.
  
  
  METHODS
  This is a cross-sectional study including a total of 599 individuals: 193 with VAD, 183 with AD, and 223 controls. Polymorphisms of the MMP-1, MMP-3, and MMP-9 genes were studied.
  
  
  RESULTS
  MMP-1 2G2G, MMP-1 1G2G, MMP-3 5A5A, and MMP-9 TT genotypes were significantly and independently associated with VAD (odds ratio [OR] 2.5, 95% confidence interval [CI] 1.4-4.4, OR = 1.7, 95% CI, 1.0-2.7, OR = 2.9, 95% CI, 1.5-5.9, and OR = 6.8, 95% CI, 1.3-35.1, respectively). MMP-1 2G2G and MMP-3 5A5A genotypes were associated with increased risk of AD only in persons who carry the apolipoprotein E (APOE) epsilon4 allele (OR = 6.0, 95% CI, 2.3-15.5, and OR = 14.3, 95% CI, 3.2-63.0, respectively). Interestingly, the odds of VAD and AD was further increased in persons concomitantly carrying more than one MMP gene variation, compared to individuals that only had one high-risk genotype.
  
  
  CONCLUSIONS
  Our study suggests that MMP gene polymorphisms are associated with VAD and AD, although these results need to be treated with caution until replicated. MMP genotypes may influence the risk of dementia and merit further investigation as potential genetic markers of disease.
authors.affiliation: Istituto di Medicina Interna e Geriatria, Policlinico A. Gemelli, Università Cattolica del Sacro Cuore, L.go A. Gemelli 8, 00168 Rome, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Flex
authors.forename: Eleonora
authors.initials: E
authors.lastname: Gaetani
authors.forename: Anna S
authors.initials: AS
authors.lastname: Proia
authors.forename: Giovanni
authors.initials: G
authors.lastname: Pecorini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Straface
authors.forename: Federico
authors.initials: F
authors.lastname: Biscetti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Fioroni
authors.forename: Alexandra
authors.initials: A
authors.lastname: Sabusco
authors.forename: Roberto
authors.initials: R
authors.lastname: Flore
authors.forename: Paolo
authors.initials: P
authors.lastname: Tondi
authors.forename: Paolo
authors.initials: P
authors.lastname: Pola
authors.forename: Roberto
authors.initials: R
authors.lastname: Pola
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000209:etiology / Q000235:genetics*; D001057:Apolipoproteins E / Q000235:genetics; D003430:Cross-Sectional Studies; D015140:Dementia, Vascular / Q000209:etiology / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D020782:Matrix Metalloproteinases / Q000235:genetics*; D011110:Polymorphism, Genetic
chemical_list: D001057:Apolipoproteins E; D020782:Matrix Metalloproteinases