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Rothhammer, Veit; Mascanfroni, Ivan D; Bunse, Lukas; Takenaka, Maisa C; Kenison, Jessica E; Mayo, Lior; Chao, Chun-Cheih; Patel, Bonny; Yan, Raymond; Blain, Manon; Alvarez, Jorge I; Kébir, Hania; Anandasabapathy, Niroshana; Izquierdo, Guillermo; Jung, Steffen; Obholzer, Nikolaus; Pochet, Nathalie; Clish, Clary B; Prinz, Marco; Prat, Alexandre; Antel, Jack; Quintana, Francisco J
Nature medicine, 06/2016, Letnik: 22, Številka: 6Journal Article
Astrocytes have important roles in the central nervous system (CNS) during health and disease. Through genome-wide analyses we detected a transcriptional response to type I interferons (IFN-Is) in astrocytes during experimental CNS autoimmunity and also in CNS lesions from patients with multiple sclerosis (MS). IFN-I signaling in astrocytes reduces inflammation and experimental autoimmune encephalomyelitis (EAE) disease scores via the ligand-activated transcription factor aryl hydrocarbon receptor (AHR) and the suppressor of cytokine signaling 2 (SOCS2). The anti-inflammatory effects of nasally administered interferon (IFN)-β are partly mediated by AHR. Dietary tryptophan is metabolized by the gut microbiota into AHR agonists that have an effect on astrocytes to limit CNS inflammation. EAE scores were increased following ampicillin treatment during the recovery phase, and CNS inflammation was reduced in antibiotic-treated mice by supplementation with the tryptophan metabolites indole, indoxyl-3-sulfate, indole-3-propionic acid and indole-3-aldehyde, or the bacterial enzyme tryptophanase. In individuals with MS, the circulating levels of AHR agonists were decreased. These findings suggest that IFN-Is produced in the CNS function in combination with metabolites derived from dietary tryptophan by the gut flora to activate AHR signaling in astrocytes and suppress CNS inflammation.
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