Lack of Proinflammatory Cytokine Interleukin-6 or Tumor Necrosis Factor Receptor-1 Results in a Failure of the Innate Immune Response after Bacterial Meningitis.

Abstract:

:The most frequent pathogen that causes bacterial meningitis is the Gram-positive bacterium Streptococcus pneumoniae. By entering the brain, host cells will be activated and proinflammatory cytokines like interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) are released. The goal of the current study was to examine the interaction between IL-6 and TNFR1 as receptor for TNF-α and the innate immune response in vivo in a model of Streptococcus pneumoniae-induced meningitis. For the experiments IL-6(-/-), TNFR1(-/-), and TNFR1-IL-6(-/-) KO mice were used. Our results revealed higher mortality rates and bacterial burden after infection in TNFR1(-/-), IL-6(-/-), and TNFR1-IL-6(-/-) mice and a decreased immune response including lower neutrophil infiltration in the meninges of TNFR1(-/-) and TNFR1-IL-6(-/-) mice in contrast to IL-6(-/-) and wild type mice. Furthermore, the increased mortality of TNFR1(-/-) and TNFR1-IL-6(-/-) mice correlated with decreased glial cell activation compared to IL-6(-/-) or wild type mice after pneumococcal meningitis. Altogether, the results show the importance of TNFR1 and IL-6 in the regulation of the innate immune response. The lack of TNFR1 and IL-6 results in higher mortality by weakened immune defence, whereas the lack of TNFR1 results in more severe impairment of the innate immune response than the lack of IL-6 alone.

journal_name

Mediators Inflamm

authors

Albrecht LJ,Tauber SC,Merres J,Kress E,Stope MB,Jansen S,Pufe T,Brandenburg LO

doi

10.1155/2016/7678542

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

7678542

eissn

0962-9351

issn

1466-1861

journal_volume

2016

pub_type

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