title: Polymorphisms of antioxidant enzymes, blood pressure and risk of hypertension.
abstract: OBJECTIVE
  To assess the association of single-nucleotide polymorphisms (SNPs) in genes codifying for antioxidant enzymes to blood pressure (BP) values and risk of hypertension.
  
  
  METHODS
  Population-based study including 1388 participants (704 women) older than 18 years in which 300 were untreated hypertensive patients. In 335 untreated hypertensive patients referred to one hypertension clinic, the study was replicated. Thirty-five SNP throughout 13 genes were analyzed using SNPlex. In a subgroup of hypertensive patients, the amount of 8-oxo-deoxyguanosine and GPX activity levels was measured in mononuclear cells.
  
  
  RESULTS
  In the general population, genotypes with the G allele of the c.172G>A polymorphism in the SOD3 gene and those with the T allele of the c.-20C>T polymorphism in the CAT gene were associated with significant lower values of BP. Likewise, these genotypes were associated with less risk for hypertension after adjusting for confounder variables. Haplotypes in both genes increased the strength of associations. In the hypertensive patients, the same alleles of the two polymorphisms were associated with lower BP values too. In addition, two others, the CT-TT genotypes of the c.891C>T polymorphism in the GPX1 gene and the CT-CC genotypes of the c.-793T>C polymorphism of the TXN gene were also significantly associated to lower BP values. Furthermore, the CC genotype of the c.891C>T polymorphism in the GPX1 gene was associated with higher values of 8-oxo-dG and GPX activity levels as compared to those for the CT-TT genotype.
  
  
  CONCLUSIONS
  The results of the present study support the influence of antioxidant enzyme genes in BP values and hypertension risk.
authors.affiliation: Genotyping and Genetic Diagnosis Unit, Hospital Clínico Research Foundation and INCLIVA, Valencia, Spain. m.luisa.mansego@uv.es
authors.forename: María L
authors.initials: ML
authors.lastname: Mansego
authors.forename: Griselda De Marco
authors.initials: Gde M
authors.lastname: Solar
authors.forename: Mónica Pineda
authors.initials: MP
authors.lastname: Alonso
authors.forename: Fernando
authors.initials: F
authors.lastname: Martínez
authors.forename: Guillermo T
authors.initials: GT
authors.lastname: Sáez
authors.forename: Juan C Martin
authors.initials: JC
authors.lastname: Escudero
authors.forename: Josep
authors.initials: J
authors.lastname: Redón
authors.forename: Felipe J
authors.initials: FJ
authors.lastname: Chaves
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000328:Adult; D000368:Aged; D001794:Blood Pressure; D002374:Catalase / Q000235:genetics*; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000032:analysis; D005260:Female; D005979:Glutathione Peroxidase / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D006973:Hypertension / Q000209:etiology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress; D020641:Polymorphism, Single Nucleotide; D012306:Risk; D013482:Superoxide Dismutase / Q000235:genetics*; D000094765:Glutathione Peroxidase GPX1
chemical_list: D000080242:8-Hydroxy-2'-Deoxyguanosine; D002374:Catalase; D005979:Glutathione Peroxidase; C441642:SOD3 protein, human; D013482:Superoxide Dismutase; D003849:Deoxyguanosine; D000094765:Glutathione Peroxidase GPX1; C000722067:GPX1 protein, human