A novel carborane analog, BE360, with a carbon-containing polyhedral boron-cluster is a new selective estrogen receptor modulator for bone

Biochem Biophys Res Commun. 2009 Mar 6;380(2):218-22. doi: 10.1016/j.bbrc.2009.01.033. Epub 2009 Jan 19.


Carboranes are a class of carbon-containing polyhedral boron-cluster compounds with globular geometry and hydrophobic surface that interact with hormone receptors. Estrogen deficiency results in marked bone loss due to increased osteoclastic bone resorption in females, but estrogen replacement therapy is not generally used for postmenopausal osteoporosis due to the risk of uterine cancer. We synthesized a novel carborane compound BE360 to clarify its anti-osteoporosis activity. BE360 showed a high binding affinity to estrogen receptors (ER), ERalpha and ERbeta. In ovariectomized (OVX) mice, femoral bone volume was markedly reduced and BE360 dose-dependently restored bone loss in OVX mice. However, BE360 did not exhibit any estrogenic activity in the uterus. BE360 also restored bone loss in orchidectomized mice without androgenic action in the sex organs. Therefore, BE360 is a novel selective estrogen receptor modulator (SERM) that may offer a new therapy option for osteoporosis.

MeSH terms

  • Animals
  • Atrophy
  • Bone Density / drug effects*
  • Bone and Bones / drug effects*
  • Boron / chemistry*
  • Boron Compounds / chemical synthesis
  • Boron Compounds / chemistry*
  • Boron Compounds / pharmacology*
  • Drug Design
  • Estrogen Receptor Modulators / chemical synthesis
  • Estrogen Receptor Modulators / chemistry*
  • Estrogen Receptor Modulators / pharmacology*
  • Female
  • Genitalia / drug effects
  • Male
  • Mice
  • Uterus / drug effects
  • Uterus / pathology


  • BE360 compound
  • Boron Compounds
  • Estrogen Receptor Modulators
  • Boron