title: [Polymorphism of the gene of vitamin D receptor and bone mineral density in postmenopausal women].
abstract: BACKGROUND
  Conflicting results have been reported on the association between restriction fragment length polymorphism at the vitamin D receptor (VDR) gene locus and bone mineral density (BMD). Population differences in environmental factors, such as calcium intake and calcidiol levels which have strong influence in BMD, may alter this association.
  
  
  METHODS
  We analyzed the Bsml RFLP at the eight introm of the VDR gene in a population sample (n = 204) of postmenopausal Spanish women aged 50-65 years being seen clinically and studied calcium intake (dietetic questionnaire) and biochemical parameters (PTH and calcidiol). In parallel bone densitometry were measured in lumbar spine and proximal femur.
  
  
  RESULTS
  We identified low BMD of the proximal femur in the BB group. This effect was not observed at other body locations. The calcium intake was lees than 500 mg/day in 60% of the studied population as calcidiol levels were lower than 10 ng/l in 36% of it. The total group population with normal calcium intake (> 1,000 mg/day) showed higher BMD (proximal femur and spine) than the group with low calcium intake, this variation not being observed in group BB alleles. Interestingly, we observed significant differences in BMD proximal femur between genotype groups BB versus Bb + bb when calcidiol levels were < 10 ng/l. Moreover, within the BB subgroup, those subjects with normal calcidiol levels have higher proximal femur BMD compared with those with low calcidiol levels.
  
  
  CONCLUSIONS
  Our results indicate an effect of the VDR genotype on BMD proximal femur which is clearly influenced by calcium intake and calcidiol serum levels.
authors.affiliation: Servicio de Reumatología, Hospital Universitario La Paz, Madrid. emarem@jet.es
authors.forename: M
authors.initials: M
authors.lastname: Bernad
authors.forename: G
authors.initials: G
authors.lastname: Jaramillo
authors.forename: P
authors.initials: P
authors.lastname: Aguado
authors.forename: T
authors.initials: T
authors.lastname: del Campo
authors.forename: J
authors.initials: J
authors.lastname: Coya
authors.forename: E
authors.initials: E
authors.lastname: Martín Mola
authors.forename: J
authors.initials: J
authors.lastname: Gijón Baños
authors.forename: H
authors.initials: H
authors.lastname: Saldaña Barrera
authors.forename: M E
authors.initials: ME
authors.lastname: Martínez
mesh_terms: D000368:Aged; D000886:Anthropometry; D015519:Bone Density / Q000235:genetics*; D002112:Calcifediol / Q000097:blood; D005260:Female; D005269:Femur / Q000502:physiology; D005796:Genes / Q000235:genetics; D005838:Genotype; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology; D008875:Middle Aged; D010024:Osteoporosis / Q000175:diagnosis; D011110:Polymorphism, Genetic / Q000235:genetics*; D017698:Postmenopause / Q000502:physiology*; D018167:Receptors, Calcitriol / Q000235:genetics*; D013030:Spain; D011795:Surveys and Questionnaires; D014807:Vitamin D / Q000235:genetics*
chemical_list: D018167:Receptors, Calcitriol; D014807:Vitamin D; D002112:Calcifediol
vernacular_title: Polimorfismo del gen del receptor de la vitamina D y densidad mineral ósea en mujeres posmenopáusicas.