Brucella induces STING-mediated Guanylate-Binding Protein expression and Unfolded Protein Response: Balancing Bacterial Elimination, Inflammation and Disease

1总结 2布鲁氏菌病是世界上最常见的人畜共患病之一， 每年新增3例人类感染。巴西的人类布鲁氏菌病是一种额外的 4.因医疗费用造成经济负担并产生重大社会影响的原因 5生产力和生活质量下降，偶尔失能或死亡。 6.牛种布氏杆菌菌株19疫苗是用于预防传播的主要疫苗 7布鲁氏菌病从牛到人在世界各地和巴西，它不是一个选择剂。 [8]对菌株19介导保护作用的机制知之甚少。主机 控制感染的疫苗诱导的9种先天免疫机制仍然存在 10模糊。此外，该疫苗含有几种抑制宿主的特性 11豁免权我们已经证明了B。流产，细菌DNA和LPS导致 12通过STING/GBP（鸟苷酸结合蛋白）轴激活炎性小体， 13布鲁氏菌复制。相反，B.流产引起未折叠蛋白反应 14（UPR），有利于布鲁氏菌在宿主中的存活。因此，我们的长远目标是 15解决布鲁氏菌如何激活先天免疫成分的黑匣子， 16导致宿主抗性与细菌破坏免疫应答。 [17]基于这些令人信服的初步数据，我们建议检验中心假设 牛种布鲁氏菌菌株19通过以下途径激活保护性先天免疫介质： 19 STING/GBP途径并触发UPR以确保细胞内复制。我们 20个具体目标是：1）确定哪些STING介导的鸟苷酸结合蛋白 21（GBP）对于将细菌DNA和LPS释放到宿主细胞中以激活 22炎性体受体; 2）为了确定未折叠蛋白是否 23布鲁氏菌诱导的反应（UPR）调节巨噬细胞极化， 24促进细菌持久性; 3）确定转录因子是否 25布鲁氏菌作用诱导巨噬细胞中HIF-1α依赖性代谢变化 26炎性小体激活和细菌清除。我们认为，我们的做法将 27阐明了免疫机制和/或发病机制，这一重要的 28人类和动物病原体。最后，调查人员对这一建议有很强的 在布鲁氏菌病研究方面有29项记录， 微生物学、先天免疫和细胞生物学。

1 Summary 2 Brucellosis is one of the world’s most frequent zoonotic diseases with over 500,000 3 new human infections every year. Human brucellosis in Brazil represents an additional 4 economic burden due to health care costs and has a major social impact due to 5 decreased productivity and quality of life and occasionally incapacitation or death. 6 Brucella abortus strain 19 vaccine is the principal vaccine used to prevent transmission 7 of brucellosis from cattle to humans worldwide and in Brazil and it is not a select agent. 8 The mechanisms that mediate protection by strain 19 are poorly understood. Host 9 mechanisms of innate immunity induced by the vaccine that control infection remain 10 obscure. Additionally, the vaccine contains several properties that are inhibitory to host 11 immunity. We have demonstrated that B. abortus, bacterial DNA and LPS leads to 12 inflammasome activation via STING/GBP (guanylate-binding protein) axis that limits 13 Brucella replication. In contrast, B. abortus induces the Unfolded Protein Response 14 (UPR) that favors Brucella survival in the host. Therefore, our long-term goal is to 15 resolve the black box of how Brucella activates innate immune components that 16 results in host resistance versus bacterial subversion of the immune response. 17 Based on these compelling preliminary data, we propose to test the central hypothesis 18 that Brucella abortus strain 19 activates protective innate immune mediators via 19 STING/GBP pathway and triggers the UPR to secure intracellular replication. Our 20 specific aims are: 1) To define which STING-mediated guanylated-binding proteins 21 (GBPs) are important to release bacterial DNA and LPS into host cells to activate 22 inflammasome receptors; 2) To determine whether the Unfolded Protein 23 Response (UPR) induced by Brucella regulates macrophage polarization to 24 facilitate bacterial persistence; 3) To determine whether the transcription factor 25 HIF-1α-dependent metabolic changes in macrophages induced by Brucella affect 26 inflammasome activation and bacterial clearance. We believe that our approach will 27 shed light on the mechanisms of immunity and/or pathogenesis of this important 28 human and animal pathogen. Finally, the investigators on this proposal have a strong 29 track record in brucellosis research and a unique combination of key expertise in 30 microbiology, innate immunity and cell biology.