title: Associations of catalase gene polymorphisms with bone mineral density and bone turnover markers in postmenopausal women.
abstract: BACKGROUND
  Oxidative stress has been recently suggested to play a part in the development of osteoporosis. Catalase is a major antioxidant enzyme that detoxifies hydrogen peroxide by converting it into water and oxygen, thereby preventing cellular injury by oxidative stress.
  
  
  OBJECTIVE
  To examine the associations between the catalase gene (CAT) polymorphisms and bone mineral density (BMD) and bone turnover markers in postmenopausal Korean women.
  
  
  METHODS
  All exons, their boundaries and the promoter region (approximately 1.5 kb) were directly sequenced in 24 individuals. Among 18 variants identified by a direct sequence method, four polymorphisms were selected and genotyped in all study participants (n = 560). BMD at the lumbar spine and proximal femur was measured using dual-energy x ray absorptiometry. Serum osteocalcin concentrations and bone-specific alkaline phosphatase activity were determined by an immunoradiometric assay and an immunoassay, respectively.
  
  
  RESULTS
  The mean (standard deviation) age of the participants was 59.4 (7.2) years. Multivariate analysis showed an association of the +22348C-->T polymorphism with BMD at the lumbar spine (p = 0.01 in the dominant model) and at femur neck (p = 0.05 in the dominant model), and with serum osteocalcin level (p = 0.008 in the dominant model). Haplotype analyses showed that HT4 (-20T, +144C, +22348T, +33078A) was significantly associated with higher BMD at various sites (p<0.001-0.03) and with lower serum osteocalcin levels (p = 0.01 in the codominant model).
  
  
  CONCLUSIONS
  These findings indicate that the +22348C-->T polymorphism and HT4 of CAT may be useful genetic markers for bone metabolism.
authors.forename: Bermseok
authors.initials: B
authors.lastname: Oh
authors.forename: Shin-Yoon
authors.initials: SY
authors.lastname: Kim
authors.forename: Duk Jae
authors.initials: DJ
authors.lastname: Kim
authors.forename: Jong Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Jong-Keuk
authors.initials: JK
authors.lastname: Lee
authors.forename: Kuchan
authors.initials: K
authors.lastname: Kimm
authors.forename: Byung Lae
authors.initials: BL
authors.lastname: Park
authors.forename: Hyoung Doo
authors.initials: HD
authors.lastname: Shin
authors.forename: Tae-Ho
authors.initials: TH
authors.lastname: Kim
authors.forename: Eui Kyun
authors.initials: EK
authors.lastname: Park
authors.forename: Jung-Min
authors.initials: JM
authors.lastname: Koh
authors.forename: Ghi Su
authors.initials: GS
authors.lastname: Kim
mesh_terms: D000368:Aged; D000469:Alkaline Phosphatase / Q000097:blood; D044466:Asian People / Q000235:genetics; D015519:Bone Density / Q000235:genetics*; D002374:Catalase / Q000235:genetics*; D005260:Female; D005819:Genetic Markers; D006239:Haplotypes; D006801:Humans; D008875:Middle Aged; D015675:Osteocalcin / Q000097:blood; D015663:Osteoporosis, Postmenopausal / Q000235:genetics* / Q000378:metabolism; D018384:Oxidative Stress; D020641:Polymorphism, Single Nucleotide; D013131:Spine / Q000473:pathology
chemical_list: D005819:Genetic Markers; D015675:Osteocalcin; D002374:Catalase; D000469:Alkaline Phosphatase