Regulation of bone mass, bone loss and osteoclast activity by cannabinoid receptors

Aymen I. Idris, R. J. van't Hof, Iain Robert Greig, Susan Ridge, D. Baker, Ruth Alexandra Ross, S. H. Ralston

Research output: Contribution to journalArticlepeer-review

286 Citations (Scopus)


Accelerated osteoclastic bone resorption has a central role in the pathogenesis of osteoporosis and other bone diseases. Identifying the molecular pathways that regulate osteoclast activity provides a key to understanding the causes of these diseases and to the development of new treatments. Here we show that mice with inactivation of cannabinoid type 1 (CB1) receptors have increased bone mass and are protected from ovariectomy-induced bone loss. Pharmacological antagonists of CB1 and CB2 receptors prevented ovariectomy-induced bone loss in vivo and caused osteoclast inhibition in vitro by promoting osteoclast apoptosis and inhibiting production of several osteoclast survival factors. These studies show that the CB1 receptor has a role in the regulation of bone mass and ovariectomy-induced bone loss and that CB1- and CB2-selective cannabinoid receptor antagonists are a new class of osteoclast inhibitors that may be of value in the treatment of osteoporosis and other bone diseases.
Original languageEnglish
Pages (from-to)774-779
Number of pages5
JournalNature Medicine
Issue number7
Publication statusPublished - Jul 2005


  • nitric-oxide synthase
  • mice
  • inhibition
  • resorption
  • activation
  • diseases


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