Helicobacter pullorum induces nitric oxide release in murine macrophages that promotes phagocytosis and killing

Helicobacter pullorum is an avian enterohepatic species that, more recently, has also been found as a naturally acquired infection in mice and rats, and isolated from patients with gastrointestinal and hepatobiliary diseases. In this work, the interaction between H. pullorum and murine macrophages w...

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Veröffentlicht in:Microbiology (Society for General Microbiology) 2016-03, Vol.162 (3), p.503-512
Hauptverfasser: Parente, Margarida R, Monteiro, João T, Martins, Gabriel G, Saraiva, Lígia M
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creator Parente, Margarida R
Monteiro, João T
Martins, Gabriel G
Saraiva, Lígia M
description Helicobacter pullorum is an avian enterohepatic species that, more recently, has also been found as a naturally acquired infection in mice and rats, and isolated from patients with gastrointestinal and hepatobiliary diseases. In this work, the interaction between H. pullorum and murine macrophages was examined. Firstly, the impact of nitric oxide, which is an antimicrobial produced by mammalian macrophages, on H. pullorum 6350-92 viability and morphology was studied by colony-forming assays and light microscopy, respectively. Exposure to nitric oxide lowered H. pullorum viability, in a growth-phase-dependent manner, and decreased the mean cell size. However, the number of coccoid forms remained low, contrasting with what has been observed for other Helicobacter species. Confocal microscopy showed that H. pullorum is internalized by murine macrophages, triggering nitric oxide production that promotes phagocytosis and killing of the pathogen. Interaction between H. pullorum and macrophages stimulated secretion of pro-inflammatory cytokines, such as TNF-α, IL-1β, IL-6 and MIP-2. These results show that H. pullorum is able to infect mammalian murine cells triggering an inflammatory response.
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subjects Animals
Cell Line
Colony Count, Microbial
Cytokines - secretion
Helicobacter
Helicobacter - cytology
Helicobacter - drug effects
Helicobacter - immunology
Helicobacter pullorum
Macrophages - immunology
Mice
Microbial Viability - drug effects
Microscopy
Nitric Oxide - secretion
Phagocytosis
title Helicobacter pullorum induces nitric oxide release in murine macrophages that promotes phagocytosis and killing
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