Defect in the Induction of Nitric Oxide Synthase by Lipopolysaccharide (LPS) in an LPS-Resistant Mutant of a Murine Macrophage-Like Cell Line, J774.1
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概要
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Nitric oxide (・NO)-generating activity was examined in a lipopolysaccharide (LPS)-resistant mutant of a murine macrophage-like cell line, J774.1,treated with LPS or LPS and interferon-γ(IFN-γ). This mutant, an LPS1916 cell line, showed no NO_2^- accumulation in the culture medium, and no expression of NOS activity in the cell extract, ・NO synthase (NOS(II)) protein or NOS(II) mRNA on treatment with up to 10^4 ng/ml LPS, although the parental cell line, JA-4,showed significant・NO production. The addition of 10 U/ml IFN-γ, together with more than 1 ng/ml LPS to JA-4 cells, increased・NO production remarkably, while IFN-γ did not reverse the defect of・NO production in LPS1916 cells when they were treated with less than 10 ng/ml LPS; however, it induced・NO production by the mutant cells with more than 100 ng/ml LPS. Analysis of NOS activity, NOS(II) protein and NOS(II) mRNA revealed that LPS1916 cells are not devoid of the NOS(II) gene, but are rather defective in transcription of the gene in response to LPS, and this defect is partly reversed by IFN-γ with higher LPS doses at more than 100 ng/ml. In addition, the delay of NOS(II) mRNA induction in LPS1916 cells, compared to that in JA-4 cells, treated with LPS+IFN-γ seems to suggest some additional inducer(s) of NOS(II) transcription, followed by LPS signaling.
- 公益社団法人日本薬学会の論文
- 1998-07-15
著者
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Numazawa Takenori
National Institute For Materials Science
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Nozawa Takashi
Institute Of Advanced Energy Kyoto University
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Amano Fumio
Department Of Biochemistry And Cell Biology National Institute Of Infectious Diseases
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NODA Tetsuji
National Institute for Materials Science
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Noda T
National Institute For Materials Science
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Noda Tetsuji
Department Of Biochemistry And Cell Biology National Institute Of Infectious Diseases:central Labora
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Noda Tetsuji
Department Of Biochemistry And Cell Biology National Institute Of Health
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Amano Fumio
Department Of Biochemistry And Cell Biology National Institute Of Health
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