Papillon-Lefèvre syndrome (PLS) is characterized by nonfunctional neutrophil serine proteases (NSPs) and fulminant periodontal inflammation of unknown cause. Here we investigated neutrophil extracellular trap (NET)-associated aggregation and cytokine/chemokine-release/degradation by normal and NSP-deficient human and mouse granulocytes. Stimulated with solid or soluble NET inducers, normal neutrophils formed aggregates and both released and degraded cytokines/chemokines. With increasing cell density, proteolytic degradation outweighed release. Maximum output of cytokines/chemokines occurred mostly at densities between 2 × 107 and 4 × 107 neutrophils/cm3. Assessment of neutrophil density in vivo showed that these concentrations are surpassed during inflammation. Association with aggregated NETs conferred protection of neutrophil elastase against α1-antitrypsin. In contrast, eosinophils did not influence cytokine/chemokine concentrations. The proteolytic degradation of inflammatory mediators seen in NETs was abrogated in Papillon-Lefèvre syndrome (PLS) neutrophils. In summary, neutrophil-driven proteolysis of inflammatory mediators works as a built-in safeguard for inflammation. The absence of this negative feedback mechanism might be responsible for the nonresolving periodontitis seen in PLS.-Hahn, J., Schauer, C., Czegley, C., Kling, L., Petru, L., Schmid, B., Weidner, D., Reinwald, C., Biermann, M. H. C., Blunder, S., Ernst, J., Lesner, A., Bäuerle, T., Palmisano, R., Christiansen, S., Herrmann, M., Bozec, A., Gruber, R., Schett, G., Hoffmann, M. H. Aggregated neutrophil extracellular traps resolve inflammation by proteolysis of cytokines and chemokines and protection from antiproteases.

Department of Dermatology Venereology and Allergology Medical University of Innsbruck Innsbruck Austria

Department of Medicine 3 Friedrich Alexander University of Erlangen Nürnberg Universitätsklinikum Erlangen Erlangen Germany

Department of Rheumatology 1st Faculty of Medicine Charles University Institute of Rheumatology Prague Czech Republic

Faculty of Chemistry University of Gdansk Gdansk Poland

Fraunhofer Institute for Integrated Circuits Erlangen Germany

Helmholtz Zentrum Berlin für Materialien und Energie Berlin Germany

Institute of Radiology Friedrich Alexander University of Erlangen Nürnberg Universitätsklinikum Erlangen Erlangen Germany

Max Planck Institute for the Science of Light Erlangen Germany

Optical Imaging Centre Erlangen Erlangen Germany

Physics Department Freie Universität Berlin Berlin Germany

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