1,2-Naphthoquinone suppresses lipopolysaccharide-dependent activation of IKKβ/NF-κB/NO signaling: an alternative mechanism for the disturbance of inducible NO synthase-catalyzed NO formation

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  • Sumi Daigo
    Master’s Program in Environmental Sciences, University of Tsukuba Doctoral Programs in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Akimori Masako
    Master’s Program in Environmental Sciences, University of Tsukuba
  • Inoue Ken-ichiro
    Environmental Health Sciences Division, National Institute for Environmental Studies
  • Takano Hirohisa
    Environmental Health Sciences Division, National Institute for Environmental Studies
  • Kumagai Yoshito
    Master’s Program in Environmental Sciences, University of Tsukuba Doctoral Programs in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba

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  • 1,2-Naphthoquinone suppresses lipopolysaccharide-dependent activation of IKK.BETA./NF-.KAPPA.B/NO signaling: an alternative mechanism for the disturbance of inducible NO synthase-catalyzed NO formation
  • 1 2 Naphthoquinone suppresses lipopolysaccharide dependent activation of IKKv NF kB NO signaling an alternative mechanism for the disturbance of inducible NO synthase catalyzed NO formation

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1,2-Naphthoquinone (1,2-NQ) is an uncoupling agent for constitutive nitric oxide (NO) synthase (NOS), thereby inhibiting its catalytic activity. However, little information on whether this quinone can affect inducible NOS (iNOS) is available. To address this issue, we examined the effect of 1,2-NQ on lipopolysaccharide (LPS)-mediated induction of iNOS. Exposure of LPS-challenged RAW264.7 cells to 1,2-NQ resulted in decreased NO formation through a reduction in iNOS production. Under these conditions, LPS-induced activation of nuclear transcription factor-κB (NF-κB) coupled to phosphorylation of inhibitory κBα (IκBα) declined. Similar effects of 1,2-NQ were observed in the lungs of mice exposed to LPS. Using IκB kinase β (IKKβ)-transfected RAW264.7 cells and recombinant IKKβ protein, we found that 1,2-NQ diminished the phosphorylation of IκB by IKKβ enzymatic activity. Taken together, these results suggest that 1,2-NQ reduces iNOS-catalyzed NO production through 1) an uncoupling reaction, as reported previously, and/or 2) disruption of IKKβ/NF-κB signaling.

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