A key regulatory role for Vav1 in controlling lipopolysaccharide endotoxemia via macrophage-derived IL-6.

A key regulatory role for Vav1 in controlling lipopolysaccharide endotoxemia via macrophage-derived IL-6.
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DOI:
10.4049/jimmunol.1300157
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发表时间:
2014-03-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Atreya I
Atreya I
中科院分区:
其他
文献类型:
--
作者:
Zenker S;Panteleev-Ivlev J;Wirtz S;Kishimoto T;Waldner MJ;Ksionda O;Tybulewicz VLJ;Neurath MF;Atreya I

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Macrophages are centrally involved in the pathogenesis of acute inflammatory diseases, peritonitis, endotoxemia and septic shock. The molecular mechanisms controlling such macrophage activation are incompletely understood, however. Here, we provide evidence that Vav1, a member of the RhoGEF family, plays a crucial role in macrophage activation and septic endotoxemia. Vav1 deficient mice demonstrated a significantly increased susceptibility for LPS endotoxemia that could be abrogated by anti-IL-6R antibody treatment. Subsequent studies showed that Vav1 deficient macrophages display augmented production of the proinflammatory cytokine IL-6. Nuclear Vav1 was identified as key negative regulator of macrophage derived IL-6 production. In fact, Vav1 formed a nuclear DNA binding complex with Heat Shock Transcription Factor 1 at the HSE2 region of the IL-6 promoter to suppress IL-6 gene transcription in macrophages. These findings provide new insights into the pathogenesis of endotoxemia and suggest new avenues for therapy.
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