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OTUB1 inhibits CNS autoimmunity by preventing IFN-γ-induced hyperactivation of astrocytes.
Wang, Xu Mulas, Floriana Yi, Wenjing Brunn, Anna Nishanth, Gopala Just, Sissy Waisman, Ari Brück, Wolfgang Deckert, Martina Schlüter, Dirk
Wang, Xu
Mulas, Floriana
Yi, Wenjing
Brunn, Anna
Nishanth, Gopala
Just, Sissy
Waisman, Ari
Brück, Wolfgang
Deckert, Martina
Schlüter, Dirk
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2019-04-03
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Astrocytes are critical regulators of neuroinflammation in multiple sclerosis (MS) and its animal model experimental autoimmune encephalomyelitis (EAE). Growing evidence indicates that ubiquitination of signaling molecules is an important cell-intrinsic mechanism governing astrocyte function during MS and EAE Here, we identified an upregulation of the deubiquitinase OTU domain, ubiquitin aldehyde binding 1 (OTUB1) in astrocytes during MS and EAE Mice with astrocyte-specific OTUB1 ablation developed more severe EAE due to increased leukocyte accumulation, proinflammatory gene transcription, and demyelination in the spinal cord as compared to control mice. OTUB1-deficient astrocytes were hyperactivated in response to IFN-γ, a fingerprint cytokine of encephalitogenic T cells, and produced more proinflammatory cytokines and chemokines than control astrocytes. Mechanistically, OTUB1 inhibited IFN-γ-induced Janus kinase (JAK)/signal transducer and activator of transcription (STAT) signaling by K48 deubiquitination and stabilization of the JAK2 inhibitor suppressor of cytokine signaling 1 (SOCS1). Thus, astrocyte-specific OTUB1 is a critical inhibitor of neuroinflammation in CNS autoimmunity.
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EMBO J. 2019;38(10):e100947. doi:10.15252/embj.2018100947.
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en
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1460-2075
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Attribution-NonCommercial-ShareAlike 4.0 International