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Inducible nitric oxide synthase and nitric oxide production inLeishmania infantum-infected human macrophages stimulated with interferon-γ and bacterial lipopolysaccharide

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International Journal of Clinical and Laboratory Research

Abstract

Nitric oxide produced by an inducible nitric oxide synthase constitutes one of the main microbicidal mechanisms of murine macrophages and its importance is now being recognized for human macrophages. In this study we evaluated inducible nitric oxide synthase expression, nitric oxide release, and parasitocidal ability ofLeishmania infantum-infected monocyte-derived human macrophages. The inducible nitric oxide synthase was detected by immunofluorescence and western blotting and nitric oxide production was measured by the Griess reaction for nitrites. Parasite killing was microscopically evaluated by fluorescent dyes. Experiments were performed on macrophages with or without previous stimulation with recombinant human interferon-γ and bacterial lipopolysaccharide. Inducible nitric oxide synthase expression and nitric oxide release were higher inLeishmania-infected stimulated macrophages than in uninfected cells or infected cells without previous stimulation. Nitric oxide production and parasitocidal activity againstLeishmania infantum were reduced in macrophages treated with the nitric oxide synthase inhibitor L-NG monomethylarginine. These results suggest a microbicidal role for nitric oxide in human leishmaniasis, with the possible practical application of immunological or pharmacological regulation of nitric oxide synthesis in the treatment of this infection.

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Authors and Affiliations

  1. Istituto di Anatomia Umana Normale, University of Bari, Policlinico, I-70124, Bari, Italy

    M. A. Panaro, A. Acquafredda, S. Lisi, D. D. Lofrumento, T. Trotta, R. Satalino, M. Saccia & V. Mitolo

  2. Dipartimento di Clinica Medica, Immunologia e Malattie Infettive, Sezione di Microbiologia ed Immunologia, University of Bari, Policlinico, I-70124, Bari, Italy

    O. Brandonisio

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  1. M. A. Panaro
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Panaro, M.A., Acquafredda, A., Lisi, S. et al. Inducible nitric oxide synthase and nitric oxide production inLeishmania infantum-infected human macrophages stimulated with interferon-γ and bacterial lipopolysaccharide. Int J Clin Lab Res 29, 122–127 (1999). https://doi.org/10.1007/s005990050076

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  • DOI: https://doi.org/10.1007/s005990050076

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