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Type I interferon (IFN) is produced when host sensors detect foreign nucleic acids, but how sensors differentiate self from nonself nucleic acids, such as double-stranded RNA (dsRNA), is incompletely understood. Mutations in ADAR1, an adenosine-to-inosine editing enzyme of dsRNA, cause Aicardi-Goutières syndrome, an autoinflammatory disorder associated with spontaneous interferon production and neurologic...
Gut microbial induction of host immune maturation exemplifies host-microbe mutualism. We colonized germ-free (GF) mice with mouse microbiota (MMb) or human microbiota (HMb) to determine whether small intestinal immune maturation depends on a coevolved host-specific microbiota. Gut bacterial numbers and phylum abundance were similar in MMb and HMb mice, but bacterial species differed, especially the...
In recent years there has been an explosion of interest to identify microbial inhabitants of human and understand their beneficial role in health. In the gut, a symbiotic host–microbial interaction has coevolved as bacteria make essential contributions to human metabolism and bacteria in turn benefits from the nutrient-rich niche in the intestine. To maintain host–microbe coexistence, the host must...
IL-17 cytokine production by the Th17 T cell subset is regulated by intestinal commmensals. We show that microbial colonization also regulates innate IL-17 production. A population of CD62L − γ/δ T cells, in particular a lineage expressing the IL-1 receptor 1 (IL-1R1), can be quickly activated by microbes to produce IL-17. Antibiotic treatment and monocolonization of mice suggest that specific...
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