IFN-gamma is a master regulator of endotoxin shock syndrome in mice primed with heat-killed Propionibacterium acnes

International Immunology
Kosuke KawaKenji Nakanishi

Abstract

Hyper-coagulation, hypothermia, systemic inflammatory responses and shock are major clinical manifestations of endotoxin shock syndrome in human. As previously reported, mice primed with heat-killed Propionibacterium acnes are highly susceptible to the action of LPS to induce tumour necrosis factor (TNF)-alpha and to that of TNF-alpha to trigger lethal shock. Here we investigated the mechanisms underlying the P. acnes-induced sensitization to LPS and TNF-alpha and the development of individual symptoms after subsequent challenge with LPS or TNF-alpha. Propionibacterium acnes-primed wild-type (WT) mice, but not naive mice, exhibited hyper-coagulation with elevated levels of thrombin-antithrombin complexes and anti-fibrinolytic plasminogen activator inhibitor 1 in their plasma, hypothermia, systemic inflammatory responses and high mortality rate after LPS or TNF-alpha challenge. Propionibacterium acnes treatment reportedly induces both T(h)1 and T(h)17 cell development. Propionibacterium acnes-primed Il12p40(-/-) and Ifngamma(-/-) mice, while not Il17A(-/-) mice, evaded all these symptoms/signs upon LPS or TNF-alpha challenge, indicating essential requirement of IL-12-IFN-gamma axis for the sensitization to LPS and TNF-alpha. Fur...Continue Reading

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