title: [Serum osteoprotegrin and serum bone gamma-carboxyglutamine acid-containing protein are correlated with bone mineral density in normal women].
abstract: OBJECTIVE
  To study the relationships of serum osteoprotegrin (sOPG), serum bone gamma-carboxyglutamine acid-containing protein (sBGP), and urine deoxypyridinoline (uDPD)/creatinine (Cr) with age and bone mineral density (BMD) in women.
  
  
  METHODS
  ELISA was used to examine the sOPG, sBGP, and uDPD/Cr of 672 female volunteers aged 20-80. The BMD (QDR4500A) value of the anteroposterior lumbar spine and femoral neck were measured by DXA.
  
  
  RESULTS
  (1) The levels of sOPG, sBGP, and uDPD/Cr in the age group of 30-39 were 2.8 pmol/L +/- 1.4 pmol/L, 5 microg/L +/- 3 microg/L, and 4.9 nmol/mmol +/- 2.5 nmol/mmol respectively, all significantly lower than those in the age groups 40-49, 50-59, and 60-69 (all P < 0.05). (2) In the age group 40-49, the values of sOPG, sBGP, and uDPD in menopausal subjects were significantly higher than those of the non-menopausal subjects (5.7 pmol/L +/- 3.1 pmol/L vs 3.4 pmol/L +/- 2.0 pmol/L, 11 microg/L +/- 5 microg/L vs 6 microg/L +/- 3 microg/L, and 6.9 nmol/mmol +/- 3.3 nmol/mmol vs 5.2 nmol/mmol +/- 3.9 nmol/mmol, all P < 0.001). (3) Age was positively correlated with sOPG, sBGP, uDPD/Cr, and BMD of anteroposterior lumbar spine and femoral neck (r = 0.130, 0.355, 0.106, -0.600, -0.545; P < 0.01). sOPG and sBGP were negatively correlated to anteroposterior lumbar spine BMD (r = -0.183, -0.108, P < 0.01; and r = -0.541, -0.441, P < 0.001). sOPG was positively correlated with sBGP and uDPD/Cr (r = 0.216 and 0.083; both P < 0.05).
  
  
  CONCLUSIONS
  sOPG, sBGP, and uDPD/Cr can be used as sensitive markers to determine the bone turnover status, which is changeable with age, and menopausal status in women, and predict the bone lose prior to BMD determination by DXA.
authors.affiliation: Institute of Metabolism and Endocrinology, the Second Xiangya Hospital, Central South University, Changsha 410011, China.
authors.forename: Tuan-yu
authors.initials: TY
authors.lastname: Fang
authors.forename: Er-yuan
authors.initials: EY
authors.lastname: Liao
authors.forename: Xian-ping
authors.initials: XP
authors.lastname: Wu
authors.forename: Shi-ping
authors.initials: SP
authors.lastname: Liu
authors.forename: Hui
authors.initials: H
authors.lastname: Xie
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiang-hang
authors.initials: XH
authors.lastname: Luo
authors.forename: Xing-zhi
authors.initials: XZ
authors.lastname: Cao
mesh_terms: D015055:1-Carboxyglutamic Acid / Q000097:blood; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000596:Amino Acids / Q000097:blood; D015415:Biomarkers / Q000097:blood; D015519:Bone Density; D001842:Bone and Bones / Q000378:metabolism*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010006:Osteoblasts / Q000378:metabolism; D015675:Osteocalcin / Q000097:blood*; D053244:Osteoprotegerin; D017698:Postmenopause / Q000097:blood / Q000502:physiology; D018124:Receptors, Tumor Necrosis Factor / Q000097:blood*
chemical_list: D000596:Amino Acids; D015415:Biomarkers; D053244:Osteoprotegerin; D018124:Receptors, Tumor Necrosis Factor; C506030:TNFRSF11B protein, human; D015675:Osteocalcin; D015055:1-Carboxyglutamic Acid; C036020:deoxypyridinoline