title: [Serum retinol binding protein 4 and bone metabolism in patients with type 2 diabetes].
abstract: OBJECTIVE
  To determine the relation between serum concentration of retinol binding protein (RBP) 4 and markers of bone metabolism, bone mineral density (BMD) in patients with type 2 diabetes mellitus (T2DM).
  
  
  METHODS
  A total of 82 patients newly diagnosed with T2DM and 46 subjects with normal glucose tolerance (NGT) enrolled in the cross-sectional study. Subset analyses were performed, dividing subjects on the basis of gender into M-T2DM, F-T2DM, M-NGT, and F-NGT. The serum concentrions of RBP4, osteocalcin (OC) and C-terminal telopeptide of collagen type I (CTX) were measured with ELISA. The BMD was measured by dual-energy X-ray absorptiometry (DXA) with a Hologic QDR4500A device.
  
  
  RESULTS
  In both the T2DM groups, lnRBP4 showed a positive relationship with lnCTX (M-T2DM, r=0.564, P<0.01; F-T2DM, r=0.386, P=0.018), but no association with lnOC. After adjusting for age, smoking, creatinine clearance rate (CCr), and waist-to-hip ratio (WHR), lnRBP4 still showed a strong association with lnCTX in the M-T2DM group (r'=0.536, P<0.01), but not in F-T2DM (r'=0.317, P=0.072). In the NGT group, there was no relation between lnRBP4 and lnCTX or lnOC. LnRBP4 showed no association with BMD in all groups.
  
  
  CONCLUSIONS
  The level of serum RBP4 may be correlated with the bone metabolism in patients with T2DM.
authors.affiliation: Institute of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, China.
authors.forename: Ailing
authors.initials: A
authors.lastname: Ye
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Peng
authors.forename: Eryuan
authors.initials: E
authors.lastname: Liao
mesh_terms: D000328:Adult; D000368:Aged; D015519:Bone Density; D001842:Bone and Bones / Q000378:metabolism*; D024042:Collagen Type I / Q000097:blood; D003430:Cross-Sectional Studies; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015675:Osteocalcin / Q000097:blood; D010455:Peptides / Q000097:blood; D054839:Retinol-Binding Proteins, Plasma / Q000378:metabolism*
chemical_list: D024042:Collagen Type I; D010455:Peptides; C101326:RBP4 protein, human; D054839:Retinol-Binding Proteins, Plasma; C052929:collagen type I trimeric cross-linked peptide; D015675:Osteocalcin