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Hemojuvelin regulates the innate immune response to peritoneal bacterial infection in mice

机译:血茱vel素调节小鼠对腹膜细菌感染的天然免疫反应

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摘要

Hereditary hemochromatosis and iron imbalance are associated with susceptibility to bacterial infection; however, the underlying mechanisms are poorly understood. Here, we performed in vivo bacterial infection screening using several mouse models of hemochromatosis, including Hfe (Hfe−/−), hemojuvelin (Hjv−/−), and macrophage-specific ferroportin-1 (Fpn1fl/fl;LysM-Cre+) knockout mice. We found that Hjv−/− mice, but not Hfe−/− or Fpn1fl/fl;LysM-Cre+ mice, are highly susceptible to peritoneal infection by both Gram-negative and Gram-positive bacteria. Interestingly, phagocytic cells in the peritoneum of Hjv−/− mice have reduced bacterial clearance, IFN-γ secretion, and nitric oxide production; in contrast, both cell migration and phagocytosis are normal. Expressing Hjv in RAW264.7 cells increased the level of phosphorylated Stat1 and nitric oxide production. Moreover, macrophage-specific Hjv knockout mice are susceptible to bacterial infection. Finally, we found that Hjv facilitates the secretion of IFN-γ via the IL-12/Jak2/Stat4 signaling pathway. Together, these findings reveal a novel protective role of Hjv in the early stages of antimicrobial defense.
机译:遗传性血色素沉着和铁不平衡与细菌感染的易感性有关。但是,对潜在的机制了解甚少。在这里,我们使用几种血色素沉着症小鼠模型进行了体内细菌感染筛选,包括Hfe(Hfe -/-),hemojuvelin(Hjv -/-)和巨噬细胞-特异性铁转运蛋白-1(Fpn1 fl / fl ; LysM-Cre + )基因敲除小鼠。我们发现Hjv -/-小鼠,但没有Hfe -/-或Fpn1 fl / fl ; < em> LysM-Cre + 小鼠对革兰氏阴性和革兰氏阳性细菌的腹膜感染高度敏感。有趣的是, Hjv -/-小鼠腹膜中的吞噬细胞减少了细菌的清除,IFN-γ的分泌和一氧化氮的产生。相反,细胞迁移和吞噬作用均正常。在RAW264.7细胞中表达 Hjv 可以增加Stat1磷酸化水平和一氧化氮的产生。此外,特定于巨噬细胞的 Hjv 基因敲除小鼠易受细菌感染。最后,我们发现Hjv通过IL-12 / Jak2 / Stat4信号通路促进IFN-γ的分泌。总之,这些发现揭示了Hjv在抗菌防御的早期阶段具有新型的保护作用。

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