Abstract
Nitric oxide NO⋅ is a pro-inflammatory effector molecule in certain inflammatory diseases, including arthritis. We investigated the production of NO⋅ by adjuvant arthritis (AA) synovial macrophages, and studied the effects of a NO⋅ synthase inhibitor, N-iminoethyl-L-ornithine (L-NIO). Compared to control rats, rats treated with L-NIO in vivo exhibited significantly lower articular index (p < 0.05), paw volume (p < 0.05), and synovial fluid cell count (p < 0.05). No effect on cutaneous delayed-type hypersensitivity to the disease-initiating antigen was observed. Inducible NO⋅ synthase (iNOS) was detected in AA synovial macrophages, and cultured AA synovial macrophage iNOS levels were increased by a factor of 138 ± 17% (p < 0.01) by 1 μg/ml LPS in vitro. Constitutive NO⋅ production by AA synovial macrophages (43 ± 1 nmol/105 cells/24 h) was significantly inhibited by 10 mM L-NIO in vitro (32 ± 0.5, p<0.01). NO⋅ production induced by 1 μg/ml LPS (48 ± 2) was also decreased by L-NIO (39 ± 2, p<0.05). In vivo L-NIO treatment also inhibited alveolar macrophage NO⋅ production (p < 0.05). The ability of L-NIO to decrease iNOS-mediated synovial macrophage NO⋅ production and inhibit the clinical parameters of AA implicate macrophage-derived NO⋅ in the pathogenesis of this disease.
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Santos, L.L., Morand, E.F., Yang, Y. et al. Suppression of Adjuvant Arthritis and Synovial Macrophage Inducible Nitric Oxide by N-iminoethyl-L-Ornithine, A Nitric Oxide Synthase Inhibitor. Inflammation 21, 299–311 (1997). https://doi.org/10.1023/A:1027397816209
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DOI: https://doi.org/10.1023/A:1027397816209