title: Serum osteoprotegerin concentrations are decreased in women with the polycystic ovary syndrome.
abstract: OBJECTIVE
  Osteoprotegerin (OPG), an inhibitor of osteoclastic bone resorption, has a variety of functions including anti-inflammatory effects and a possible cardiovascular protective role. Both low-grade chronic inflammation and cardiovascular risk are increased in women with the polycystic ovary syndrome (PCOS). We aimed to study serum OPG concentrations in PCOS patients.
  
  
  METHODS
  Case-control study including 40 PCOS patients matched with 40 non-hyperandrogenic women for age and body mass index.
  
  
  METHODS
  Basal serum sampling and standard oral glucose tolerance test, and measurement of serum OPG concentrations by commercial ELISA.
  
  
  RESULTS
  Serum OPG concentrations were lower in women with PCOS compared with those of controls (304+/-120 vs 363+/-105 pg/ml respectively; F=7.641, P=0.007) independently of obesity. No differences were observed in serum receptor activator of nuclear factor-kappaB ligand (RANKL) levels and in the RANKL/OPG molar ratio. A multivariate linear regression model (R(2)=0.208, F=6.579, P=0.001) showed that PCOS (beta=-0.281, P=0.008), obesity (beta=-0.245, P=0.022) and age (beta=0.296, P=0.006) were predictive of serum OPG concentrations.
  
  
  CONCLUSIONS
  Serum OPG concentrations are reduced in PCOS patients independently of obesity. Considering the anti-inflammatory effects of OPG, its reduced serum concentrations might contribute to the proinflammatory state and cardiovascular risk of PCOS patients.
authors.affiliation: Department of Endocrinology, Hospital Ramón y Cajal & Universidad de Alcalá, Madrid, Spain.
authors.forename: Héctor F
authors.initials: HF
authors.lastname: Escobar-Morreale
authors.forename: José I
authors.initials: JI
authors.lastname: Botella-Carretero
authors.forename: Ma Angeles
authors.initials: MA
authors.lastname: Martínez-García
authors.forename: Manuel
authors.initials: M
authors.lastname: Luque-Ramírez
authors.forename: Francisco
authors.initials: F
authors.lastname: Alvarez-Blasco
authors.forename: José L
authors.initials: JL
authors.lastname: San Millán
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D016022:Case-Control Studies; D015536:Down-Regulation; D005260:Female; D012739:Gonadal Steroid Hormones / Q000097:blood; D006628:Hirsutism / Q000097:blood / Q000150:complications / Q000175:diagnosis; D006801:Humans; D009765:Obesity / Q000097:blood / Q000150:complications; D053244:Osteoprotegerin / Q000097:blood*; D011085:Polycystic Ovary Syndrome / Q000097:blood* / Q000150:complications / Q000503:physiopathology; D053245:RANK Ligand / Q000097:blood; D012738:Sex Hormone-Binding Globulin / Q000032:analysis; D013739:Testosterone / Q000097:blood
chemical_list: D012739:Gonadal Steroid Hormones; D053244:Osteoprotegerin; D053245:RANK Ligand; D012738:Sex Hormone-Binding Globulin; C505688:TNFSF11 protein, human; D013739:Testosterone