Background: Some of cannabinoids, which are chemical compounds contained in marijuana, are immunosuppressive. One of the receptors, CB receptor 1 (CB1), is expressed predominantly by the cells in the central nervous system, whereas CB receptor 2 (CB2) is expressed primarily by immune cells. Theoretically, selective CB2 agonists should be devoid of psychoactive effects. In this study, we investigated therapeutic effects of a selective CB2 agonist on arthritis. Methods: The expression of CB2 was analyzed with immunohistochemistry and Western blotting. Interleukin (IL)-6, matrix metalloproteinase-3 (MMP-3), and chemokine (C-C motif) ligand 2 (CCL2) were quantified with enzyme-linked immunosorbent assays (ELISA). Osteoclastogenesis was assessed with tartrate-resistant acid...

Cannabis sativa has been used as an anti-inflammatory plant for millennia. However until the elucidation of the chemistry of its constituents and the discovery of the endogenous cannabinoid system only a limited amount of research had been done on the effects of the plant or its constituents on inflammation. In the present overview we summarize our work on the effects of the non-psychotropic cannabidiol (CBD) and of a synthetic cannabidiol-derived acid (HU-320) in animal models of arthritis. Both compounds block progression of the disease, when administered after its onset. Cannabidiol was equally effective was administered i.p. or orally. Significant protection of the joints against...

Interleukin-6 (IL-6) is a multifunctional cytokine which contributes to inXammation and tissue injury in several diseases. Thus, inhibition of IL-6 production may be a useful strategy for treatment of patients with diseases such as rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). A synthetic nonpsychoactive cannabinoid, ajulemic acid (AjA), prevents joint damage in experimental arthritis. Results of experiments presented here indicate that addition of AjA (3–30 M) to human monocyte derived macrophages in vitro reduces steady state levels of IL-6 mRNA and the subsequent secretion of IL-6 from LPS stimulated cells. Although AjA binds to and activates PPAR, its anti IL-6 eVects are PPAR...