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The type 2 cannabinoid receptor regulates susceptibility to osteoarthritis in mice

A Sophocleous1, A E Börjesson1, D M Salter2

  • 1Rheumatology and Bone Diseases Unit, Centre for Genomic and Experimental Medicine, MRC Institute of Genetics and Molecular Medicine, Western General Hospital, University of Edinburgh, Edinburgh, EH4 2XU, UK.

Osteoarthritis and Cartilage
|May 5, 2015
PubMed
Abstract

Insights

The type 2 cannabinoid receptor (Cnr2) pathway plays a key role in osteoarthritis development. Activating CB2 receptors showed a protective effect, suggesting a therapeutic target for osteoarthritis.

Area of Science:

  • Biomedical Science
  • Molecular Biology
  • Immunology

Background:

  • Cannabinoid receptors regulate physiological processes.
  • The role of cannabinoid receptors in osteoarthritis (OA) remains largely unexplored.
  • Type 2 cannabinoid receptor (Cnr2) is a potential target for OA research.

Purpose of the Study:

  • To investigate the role of Cnr2 in OA susceptibility in mice.
  • To evaluate the impact of Cnr2 deletion on OA development.
  • To assess the therapeutic potential of CB2 receptor activation in OA.

Main Methods:

  • Osteoarthritis severity was assessed using the OARSI scoring system in Cnr2 knockout (Cnr2(-/-)) and wild-type (WT) mice.
  • OA was induced by surgical destabilization of the medial meniscus (DMM) or occurred spontaneously with age.
  • Pharmacological activation of CB2 receptors was tested using the selective agonist HU308.

Main Results:

  • Cnr2(-/-) mice exhibited more severe knee osteoarthritis after DMM compared to WT mice.
  • Pharmacological activation of CB2 receptors with HU308 reduced OA severity in WT mice.
  • Age-related spontaneous OA was also more severe in Cnr2(-/-) mice, with reduced proteoglycan production by chondrocytes.

Conclusions:

  • The Cnr2 pathway is implicated in the pathophysiology of osteoarthritis in mice.
  • Pharmacological activation of CB2 receptors demonstrates a protective effect against OA.
  • Further research into cannabinoid receptors in human OA pathogenesis is warranted.
Keywords:
CB2CannabinoidsCartilageCnr2Mouse modelOsteoarthritis

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