title: [Effects of 1 alpha(OH)D3 on trabecular and cortical bone in ovariectomized rats].
abstract: OBJECTIVE
  To study the pharmaceutical effects of 1 alpha(OH)D3 on trabecular and cortical bone in ovariectomized (OVX) rats.
  
  
  METHODS
  41 female Wistar rats of six months old were randomly divided into 5 groups: (1) Baseline control; (2) Sham control; (3) 6 weeks after OVX (OVXb); (4) 14 weeks after OVX (OVXe); (5) OVX + 0.1 microgram/(kg.d) 1 alpha(OH)D3 (O + VD), treatment started 6 weeks after OVX and lasted 8 weeks. Histomorphometry analysis of tibia, peripheral quantitative computed tomography (pQCT) scanning of femur, bone biomechanical test and serum and urinary biochemical parameters were determined.
  
  
  RESULTS
  The levels of bone turnover indexes increased in OVX rats, OVX also resulted in reducing of trabecular, bone mass and biomechanical properties. The ratio of urinary deoxypyridinoline crosslink/creatinine was decreased by 67.0% in O + VD group compared with OVXe group 67.0% [(43.50 +/- 11.20) nmol.L-1/mmol.L-1 vs(131.80 +/- 14.90) nmol.L-1/mmol.L-1, P < 0.01]. Percent trabecular area (Cn-BV/TV) was increased by 89.8% in O + VD group compared with OVXe group (11.03 +/- 0.73 vs 5.81 +/- 1.29, P < 0.05). Trabecular bone mineral content and density were increased by 77.3% and 91.3% compared with OVXe respectively (P < 0.05). Although cancellous maximal load and stiffness increased in O + VD group, but no statistical significance. 1 alpha(OH)D3 also enhanced polar moment of inertia (PMI) and maximal load of cortical bone in femur compared with OVXe (23.70 +/- 1.63 vs 18.23 +/- 1.41, P < 0.01 and 171.69 +/- 9.92 vs 147.58 +/- 11.29, P < 0.05 respectively).
  
  
  CONCLUSIONS
  1 alpha(OH)D3 inhibited the higher bone turnover induced by OVX, increased trabecular bone in proximal tibia and bone mass in distal femur. 1 alpha(OH)D3 also improved the mechanical properties of cortical bone in femur.
authors.affiliation: Department of Endocrinology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China.
authors.forename: W
authors.initials: W
authors.lastname: Xia
authors.forename: X
authors.initials: X
authors.lastname: Meng
authors.forename: X
authors.initials: X
authors.lastname: Xing
authors.forename: Y
authors.initials: Y
authors.lastname: Hu
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: X
authors.initials: X
authors.lastname: Zhou
authors.forename: G
authors.initials: G
authors.lastname: Qiu
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.forename: V
authors.initials: V
authors.lastname: Shen
authors.forename: D
authors.initials: D
authors.lastname: Wu
authors.forename: D
authors.initials: D
authors.lastname: Dempster
authors.forename: R
authors.initials: R
authors.lastname: Lindsay
mesh_terms: D000818:Animals; D015519:Bone Density / Q000187:drug effects*; D001862:Bone Resorption / Q000517:prevention & control*; D005260:Female; D006887:Hydroxycholecalciferols / Q000494:pharmacology*; D010024:Osteoporosis / Q000188:drug therapy*; D010052:Ovariectomy; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar
chemical_list: D006887:Hydroxycholecalciferols