title: Activation of cannabinoid CB2 receptor negatively regulates IL-12p40 production in murine macrophages: role of IL-10 and ERK1/2 kinase signaling.
abstract: 1 Cannabinoid (CB) receptor agonists have potential utility as anti-inflammatory drugs for the treatment of many disease conditions. In the present study, we investigated the effects of the synthetic CB(2) ligand, JWH-133 on the production of interleukins (ILs), IL-12 and IL-10 by lipopolyssacharide (LPS) or Theiler's virus (TMEV)-activated macrophages. 2 JWH-133 evoked a concentration-related inhibition (10 nM-5 microM) of LPS/IFN-gamma induced IL-12p40 release. The effect of JWH-133 (100 nM) was significantly blocked by the CB2 antagonist SR-144528 (1 microM). Macrophages infected with TMEV increased IL-12p40 production and activation of CB2 receptors by JWH-133 (100 nM) inhibited it. 3 The inhibitory effect of JWH-133 (100 nM) on IL-12p40 production may involve extracellular-regulated kinase (ERK1/2) signaling: (i) JWH-133 induced a greater and sustained activation of ERK1/2 kinase in comparison with the level of activation observed following LPS; (ii) the inhibition of ERK1/2 by the specific inhibitor PD98059 increased LPS-induced IL-12p40 production in the presence or absence of JWH-133 suggesting a negative regulation of ERK pathway on IL-12p40 biosynthesis. 4 Activation of CB2 receptors by JWH-133 (10 nM-5 microM) enhanced IL-10 release by LPS/IFN-gamma-activated macrophages and addition of SR144558 (1 microM) totally blocked the effect of JWH (100 nM). 5 Inhibition of ERK by PD98059 significantly suppressed IL-10 production by LPS-activated macrophages. Endogenous IL-10 plays a modulatory role in IL-12 production. Blocking IL-10 with neutralizing antibody resulted in increased IL-12p40 secretion by LPS-activated macrophages in the absence or presence of JWH-133. In contrast, the addition of exogenous mIL-10 reduced the secretion of IL-12p40 in response to LPS.
authors.affiliation: Neuroimmunology Group, Neural Plasticity Department, Cajal Institute, CSIC Avda Dr Arce 37, 28002, Madrid, Spain.
authors.forename: Fernando
authors.initials: F
authors.lastname: Correa
authors.forename: Leyre
authors.initials: L
authors.lastname: Mestre
authors.forename: Fabian
authors.initials: F
authors.lastname: Docagne
authors.forename: Carmen
authors.initials: C
authors.lastname: Guaza
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002186:Cannabinoids / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005419:Flavonoids / Q000494:pharmacology; D007371:Interferon-gamma / Q000494:pharmacology; D016753:Interleukin-10 / Q000378:metabolism; D018664:Interleukin-12 / Q000096:biosynthesis*; D053762:Interleukin-12 Subunit p40; D008070:Lipopolysaccharides / Q000494:pharmacology; D008262:Macrophage Activation / Q000187:drug effects; D017737:Macrophages, Peritoneal / Q000187:drug effects / Q000378:metabolism* / Q000821:virology; D051379:Mice; D008807:Mice, Inbred BALB C; D008815:Mice, Inbred Strains; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000037:antagonists & inhibitors / Q000378:metabolism; D021122:Protein Subunits / Q000096:biosynthesis*; D043885:Receptor, Cannabinoid, CB2 / Q000819:agonists / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D013997:Time Factors
chemical_list: D002186:Cannabinoids; D005419:Flavonoids; D053762:Interleukin-12 Subunit p40; D008070:Lipopolysaccharides; D021122:Protein Subunits; D043885:Receptor, Cannabinoid, CB2; D016753:Interleukin-10; D018664:Interleukin-12; D007371:Interferon-gamma; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one; C432747:1,1-dimethylbutyl-1-deoxy-Delta(9)-THC