OTUB1 Inhibits CNS Autoimmunity by Preventing IFN-γ-induced Hyperactivation of Astrocytes

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2019 Apr 5

PMID 30944096

Citations 23

Authors

Xu Wang

Floriana Mulas

Wenjing Yi

Anna Brunn

Gopala Nishanth

Sissy Just

Ari Waisman

Wolfgang Bruck

Martina Deckert

Dirk Schluter

Affiliations

Soon will be listed here.

Abstract

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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