Francisella tularensis SchuS4 and SchuS4 lipids inhibit IL-12p40 in primary human dendritic cells by inhibition of IRF1 and IRF8.
Francisella tularensis SchuS4 and SchuS4 lipids inhibit IL-12p40 in primary human dendritic cells by inhibition of IRF1 and IRF8.
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DOI：
10.4049/jimmunol.1300867
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发表时间：
2013-08-01
期刊：
影响因子：
--
通讯作者：
Bosio CM
中科院分区：
文献类型：
--
作者：
Ireland R;Wang R;Alinger JB;Small P;Bosio CM
Induction of innate immunity is essential for host survival of infection. Evasion and inhibition of innate immunity is a strategy used by pathogens, such as the highly virulent bacterium Francisella tularensis, to ensure their replication and transmission. The mechanism and bacterial components responsible for this suppression of innate immunity by F. tularensis are not defined. Here, we demonstrate that lipids enriched from virulent F. tularensis strain SchuS4, but not attenuated Live Vaccine Strain (LVS), inhibit inflammatory responses in vitro and in vivo. Suppression of inflammatory responses is associated with IκBα independent inhibition of NF-κBp65 activation and selective inhibition of activation of Interferon Regulatory Factors (IRFs). Interference with NF-κBp65 and IRFs is also observed following infection with viable SchuS4. Together these data provide novel insight as to how highly virulent bacteria selectively modulate the host to interfere innate immune responses required for survival of infection.
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