Parasitology Research

, Volume 101, Issue 2, pp 269–274 | Cite as

Nitric oxide production and nitric oxide synthase immunoreactivity in Naegleria fowleri

  • Saúl Rojas-HernándezEmail author
  • Marco A. Rodríguez-Monroy
  • Leticia Moreno-Fierros
  • Adriana Jarillo-Luna
  • Marisela Carrasco-Yepez
  • Angel Miliar-García
  • Rafael Campos-Rodríguez
Original Paper


Free-living ameba Naegleria fowleri produces an acute and fatal infectious disease called primary amebic meningoencephalitis (PAM), whose pathophysiological mechanism is largely unknown. The aim of this study was to investigate the role of nitric oxide (NO) in PAM. Although NO has a cytotoxic effect on various parasites, it is produced by others as part of the pathology, as is the case with Entamoeba histolytica. To test for the production of NO, we analyzed whether antibodies against mammalian NO synthase isoforms (neuronal, inducible, and endothelial) presented immunoreactivity to N. fowleri proteins. We found that the trophozoites produced NO in vitro. The Western blot results, which showed N. fowleri trophozoites, contained proteins that share epitopes with the three described mammalian NOS, but have relative molecular weights different than those described in the literature, suggesting that N. fowleri may contain undescribed NOS isoforms. Moreover, we found that trophozoites reacted to the NOS2 antibody, in amebic cultures as well as in the mouse brain infected with N. fowleri, suggesting that nitric oxide may participate in the pathogenesis of PAM. Further research aimed at determining whether N. fowleri contains active novel NOS isoforms could lead to the design of new therapies against this parasite.


Nitric Oxide Epitope Mapping Entamoeba Histolytica Relative Molecular Weight Polyclonal Serum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Saúl Rojas-Hernández
    • 1
    Email author
  • Marco A. Rodríguez-Monroy
    • 2
  • Leticia Moreno-Fierros
    • 2
  • Adriana Jarillo-Luna
    • 1
  • Marisela Carrasco-Yepez
    • 2
  • Angel Miliar-García
    • 1
  • Rafael Campos-Rodríguez
    • 1
  1. 1.Departamento de Investigación y PosgradoEscuela Superior de Medicina, Instituto Politécnico NacionalMéxicoMexico
  2. 2.Inmunidad en Mucosas UBIMEDFES-Iztacala, Universidad Nacional Autónoma de MéxicoTlalnepantlaMexico

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