title: [Effects of soybean isoflavones on expression levels of osteoprotegerin and osteoprotegerin ligand mRNAs in bone tissues of ovariectomized rats].
abstract: OBJECTIVE
  To investigate the effects of soybean isoflavones (SI) on expression levels of osteoprotegerin (OPG) and osteoprotegerin ligand (OPGL) mRNAs in bone tissues of ovariectomized rats, and to discuss the mechanism of soybean isoflavaones in preventing and treating postmenopausal osteoporosis (PMO).
  
  
  METHODS
  Thirty adult SD rats were randomly divided into 3 groups: sham-operation group, untreated group and SI-treated group. The rats in the last two groups were bilaterally ovariectomized. The bone density of L(3) to L(6) vertebrae was detected after 12-week intervention. Total RNA was extracted from femur head and the expression levels of OPG and OPGL mRNAs were examined by real-time quantitative polymerase chain reaction.
  
  
  RESULTS
  SI could increase the bone density of lumbar vertebrae in ovariectomized rats, up-regulate the expression level of OPG mRNA and down-regulate the ratio of OPGL mRNA/OPG mRNA, but exert no significant effect on the expression of OPGL mRNA.
  
  
  CONCLUSIONS
  The therapeutic effects of SI on PMO may be related to regulating the expression levels of OPG and OPGL mRNAs, and the ratio of OPGL mRNA/OPG mRNA.
authors.affiliation: Department of Orthopaedics, Second Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province 710004, China. dadaol@126.com
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
authors.forename: Kun-Zheng
authors.initials: KZ
authors.lastname: Wang
authors.forename: Guang-Ye
authors.initials: GY
authors.lastname: Wang
mesh_terms: D000818:Animals; D015519:Bone Density; D001842:Bone and Bones / Q000378:metabolism; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D006023:Glycoproteins / Q000096:biosynthesis* / Q000235:genetics; D007529:Isoflavones / Q000494:pharmacology*; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics; D053244:Osteoprotegerin; D010052:Ovariectomy; D053245:RANK Ligand; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D018160:Receptors, Cytoplasmic and Nuclear / Q000096:biosynthesis* / Q000235:genetics; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis* / Q000235:genetics; D013025:Glycine max / Q000737:chemistry*
chemical_list: D002352:Carrier Proteins; D006023:Glycoproteins; D007529:Isoflavones; D008562:Membrane Glycoproteins; D053244:Osteoprotegerin; D053245:RANK Ligand; D012333:RNA, Messenger; D018160:Receptors, Cytoplasmic and Nuclear; D018124:Receptors, Tumor Necrosis Factor; C506032:Tnfrsf11b protein, rat