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- W1946756321 abstract "Previous studies have shown that mice primed with Corynebacterium parvum produce higher levels of inflammatory cytokines than unprimed mice upon challenge with lipopolysaccharide (LPS). Herein, we describe experiments in which two cannabinoid (CB) agonists, WIN 55212-2 [(R)-(+)-[2, 3-dihydro-5-methyl-3-[(4-morpholinyl)methyl]pyrrolo[1,2,3-de]1, 4-benzoxazin-6-yl](1-naphthyl)methanone) and HU-210 [(-)-11-hydroxy-delta(8) tetrahydrocannabinol-dimethylheptyl], were examined for their effects on LPS-induced cytokines in C. parvum-primed and unprimed mice. These agonists have been reported to bind selectively to the CB2 and CB1 receptor subtypes, respectively. WIN 55212-2 (3.1-50 mg/kg i.p.) and HU-210 (0.05-0.4 mg/kg i.p.) decreased serum tumor necrosis factor-alpha and interleukin-12 (IL-12) and increased IL-10 when administered to mice before LPS. The drugs also protected C. parvum mice (but not unprimed mice) against the lethal effects of LPS. The protection afforded to C. parvum mice could not be attributed to the higher levels of IL-10 present in these mice after agonist treatment. The WIN 55212-2- and HU-210-mediated changes in the responsiveness of mice to LPS were antagonized by SR141716A [N-(piperdin-1-yl)-5-(4-chloropheny)-1-(2, 4-dichloropheny)-4-methyl-1H-pyrazole-3-carboxamide hydrochloride], a selective CB1 receptor antagonist, but not by SR144528 [N-[(1S)-endo-1,3,3-trimethylbicyclo[2.2. 1]heptan-2-yl]5-(4-choro-3-methylphenyl)-1-(4-methylbenzyl)p yrazole-3 -carboxamide], a selective antagonist at the CB2 receptor. Therefore, both CB agonists modulated LPS responses through the CB1 receptor. Surprisingly, SR141716A itself modulated cytokine responses in a manner identical with that of WIN 55212-2 and HU-210 when administered alone to mice. The agonist-like effects of SR141716A, which were more striking in unprimed than in primed mice, suggested that the antagonist also could function as a partial agonist at the CB1 receptor. Our findings indicate a role for the CB1 receptor subtype in cytokine modulation by CB ligands." @default.
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- W1946756321 date "2000-04-01" @default.
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- W1946756321 title "Effects of Cannabinoid Receptor Agonist and Antagonist Ligands on Production of Inflammatory Cytokines and Anti-Inflammatory Interleukin-10 in Endotoxemic Mice" @default.
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