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- W2014712705 abstract "Experimental autoimmune encephalomyelitis (EAE) is a T cell-mediated inflammatory demyelinating disorder of the central nervous system (CNS) which serves as a prime animal model for the human disease multiple sclerosis. Previous studies from these laboratories demonstrated excess nitric oxide (NO) in the CNS of EAE-affected mice, and amelioration of EAE with a selective inhibitor of the inducible nitric oxide synthase (iNOS). Recent studies from other laboratories have indicated that prostaglandin PGE2 is increased in CNS tissues of EAE-affected rodents and that EAE is prevented by the inhibition of cyclooxygenase activity. The present study investigated the ability of encephalitogenic lymphoid cells to induce NOS and cyclooxygenase (COX-2) in the murine macrophage line, RAW 264.7. In order to mimic the extracellular milieu present in EAE lesions, conditioned medium (CM) of activated EAE-inducer cells was added to this macrophage line. CM caused a time-dependent increase in nitrite, indicating NO production. Reverse-transcriptase PCR demonstrated iNOS mRNA in RAW 264.7 cells, first detected at 3 h, and Western blots confirmed the induction in RAW cells of the 130-kDa iNOS protein. Production of nitrite by CM-exposed RAW 264.7 cells was blocked by inhibitors of NOS (L-N-methylarginine or aminoguanidine) or by antibodies to murine IFN-gamma or IL-1 beta. CM of activated encephalitogenic cells induced production of PGE2 by RAW 264.7 cells, as determined by ELISA, and Western blots identified the presence of the 70-80-kDa inducible COX (COX-2) protein. Induction of COX-2 could be inhibited by antibody to IFN-gamma. Thus, encephalitogenic cells are capable of inducing the expression of the inflammatory enzymes iNOS and COX-2 in a murine macrophage line via the T cell cytokine IFN-gamma, alone or in combination with IL-1 beta." @default.
- W2014712705 created "2016-06-24" @default.
- W2014712705 creator A5070040722 @default.
- W2014712705 date "1995-09-01" @default.
- W2014712705 modified "2023-10-13" @default.
- W2014712705 title "Mediation of inflammation by encephalitogenic cells: interferon γ induction of nitric oxide synthase and cyclooxygenase 2" @default.
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- W2014712705 doi "https://doi.org/10.1016/0165-5728(95)00091-f" @default.
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