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Front Immunol. 2016 Dec 1;7:557. eCollection 2016.

Oxidative Burst-Dependent NETosis Is Implicated in the Resolution of Necrosis-Associated Sterile Inflammation.

Author information

1
Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg , Erlangen , Germany.
2
UMR CNRS 8520, Institut d'Electronique de Microélectronique et de Nanotechnologie (IEMN), Université Lille 1 , Villeneuve d'Ascq , France.
3
Danylo Halytsky Lviv National Medical University , Lviv , Ukraine.
4
Department of Rheumatology and Immunology, West China Hospital, Sichuan University , Chengdu , China.

Abstract

Necrosis is associated with a profound inflammatory response. The regulation of necrosis-associated inflammation, particularly the mechanisms responsible for resolution of inflammation is incompletely characterized. Nanoparticles are known to induce plasma membrane damage and necrosis followed by sterile inflammation. We observed that injection of metabolically inert nanodiamonds resulted in paw edema in WT and Ncf1** mice. However, while inflammation quickly resolved in WT mice, it persisted over several weeks in Ncf1** mice indicating failure of resolution of inflammation. Mechanistically, NOX2-dependent reactive oxygen species (ROS) production and formation of neutrophil extracellular traps were essential for the resolution of necrosis-induced inflammation: hence, by evaluating the fate of the particles at the site of inflammation, we observed that Ncf1** mice deficient in NADPH-dependent ROS failed to generate granulation tissue therefore being unable to trap the nanodiamonds. These data suggest that NOX2-dependent NETosis is crucial for preventing the chronification of the inflammatory response to tissue necrosis by forming NETosis-dependent barriers between the necrotic and healthy surrounding tissue.

KEYWORDS:

NETosis; inflammation; nanodiamonds; necrosis; reactive oxygen species; resolution

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