title: Association of matrix Gla protein gene functional polymorphisms with loss of bone mineral density and progression of aortic calcification.
abstract: Two matrix Gla protein (MGP) polymorphisms were associated with progression of aortic calcification and femoral neck bone loss in men. All these findings were also functionally corroborated in two vascular and bone in vitro systems indicating that MGP genetic variations can be partly responsible of higher risk of bone loss and vascular calcification.
  
  
  BACKGROUND
  MGP plays an important role in bone and vascular mineralization as confirmed by MGP-deficient murine model. We therefore aimed to find a genetic association among -138T>C, -7G>A, and Thr83Ala MGP single-nucleotide polymorphisms (SNPs), bone loss, and progression of aortic calcification in a randomly selected general population of 296 individuals who participated in the European Vertebral Osteoporosis Study.
  
  
  METHODS
  To evaluate the rate of change in bone mineral density (BMD) and the progression of aortic calcification, dual X-ray absorptiometry and lateral spine X-rays were performed at baseline and after 4 years of follow-up. Genotyping for the three polymorphisms was carried out using polymerase chain reaction and restriction fragment length analysis. In addition, functional studies of MGP-7G>A and Thr83Ala SNPs were performed on transiently transfected osteoblast-like UMR-106 and vascular smooth muscle A7r5 cells.
  
  
  RESULTS
  The proportion of men who had lost BMD in the femoral neck was higher among homozygous -7AA and 83Ala-Ala (p = 0.039 and p = 0.009, respectively), and also featured a higher risk of progression of aortic calcifications (OR = 5.6, 95% CI = 1.2-27.8 and OR = 6.8, 95% CI = 1.4-32.3, respectively). No effect was observed in women. The MGP-7A allele produced a reduction in luciferase activity compared to MGP-7G: 47% less in vascular cells and 34% less in bone cells (p = 0.001 and 0.012, respectively). In vascular cells under calcifying conditions, the MGP 83Thr allele showed a slightly higher, although not significant, inhibition than the MGP 83 Ala allele in calcium content suggesting functional differences between both variants.
  
  
  CONCLUSIONS
  These results suggest that MGP genetic variations could predict a higher risk of bone loss and progression of vascular calcification in men.
authors.affiliation: Bone and Mineral Research Unit, Instituto Reina Sofía de Investigación, REDinREN from ISCIII, Hospital Universitario Central de Asturias, Universidad de Oviedo, C/ Julián Clavería s/n, 33006, Oviedo, Asturias, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Tuñón-Le Poultel
authors.forename: J B
authors.initials: JB
authors.lastname: Cannata-Andía
authors.forename: P
authors.initials: P
authors.lastname: Román-García
authors.forename: J B
authors.initials: JB
authors.lastname: Díaz-López
authors.forename: E
authors.initials: E
authors.lastname: Coto
authors.forename: C
authors.initials: C
authors.lastname: Gómez
authors.forename: M
authors.initials: M
authors.lastname: Naves-Díaz
authors.forename: I
authors.initials: I
authors.lastname: Rodríguez
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001018:Aortic Diseases / Q000235:genetics*; D015519:Bone Density / Q000235:genetics; D002135:Calcium-Binding Proteins / Q000235:genetics*; D018450:Disease Progression; D016326:Extracellular Matrix Proteins / Q000235:genetics*; D005260:Female; D005272:Femur Neck / Q000503:physiopathology; D005500:Follow-Up Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D008159:Lumbar Vertebrae / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000235:genetics* / Q000503:physiopathology; D020641:Polymorphism, Single Nucleotide; D012737:Sex Factors; D061205:Vascular Calcification / Q000235:genetics*; D000097568:Matrix Gla Protein
chemical_list: D002135:Calcium-Binding Proteins; D016326:Extracellular Matrix Proteins; D000097568:Matrix Gla Protein