Fachbereich Veterinärmedizin



    IL-37 Causes Excessive Inflammation and Tissue Damage in Murine Pneumococcal Pneumonia (2017)

    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Schauer, Anja E
    Klassert, Tilman E
    von Lachner, Carolin
    Riebold, Diana
    Schneeweiß, Anne
    Stock, Magdalena
    Müller, Mario M
    Hammerschmidt, Sven
    Bufler, Philip
    Seifert, Ulrike
    Dietert, Kristina (WE 12)
    Dinarello, Charles A
    Nold, Marcel F
    Gruber, Achim D (WE 12)
    Nold-Petry, Claudia A
    Slevogt, Hortense
    Journal of innate immunity; 9(4) — S. 403–418
    ISSN: 1662-8128
    DOI: 10.1159/000469661
    Pubmed: 28601872
    Institut für Tierpathologie

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    Abstract / Zusammenfassung

    Streptococcus pneumoniae infections can lead to severe complications with excessive immune activation and tissue damage. Interleukin-37 (IL-37) has gained importance as a suppressor of innate and acquired immunity, and its effects have been therapeutic as they prevent tissue damage in autoimmune and inflammatory diseases. By using RAW macrophages, stably transfected with human IL-37, we showed a 70% decrease in the cytokine levels of IL-6, TNF-α, and IL-1β, and a 2.2-fold reduction of the intracellular killing capacity of internalized pneumococci in response to pneumococcal infection. In a murine model of infection with S. pneumoniae, using mice transgenic for human IL-37b (IL-37tg), we observed an initial decrease in cytokine expression of IL-6, TNF-α, and IL-1β in the lungs, followed by a late-phase enhancement of pneumococcal burden and subsequent increase of proinflammatory cytokine levels. Additionally, a marked increase in recruitment of alveolar macrophages and neutrophils was noted, while TRAIL mRNA was reduced 3-fold in lungs of IL-37tg mice, resulting in necrotizing pneumonia with augmented death of infiltrating neutrophils, enhanced bacteremic spread, and increased mortality. In conclusion, we have identified that IL-37 modulates several core components of a successful inflammatory response to pneumococcal pneumonia, which lead to increased inflammation, tissue damage, and mortality.