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IMM_Cleveland LiXX_EAE-Th1 or Th17_Act1 ko mouse_CNS_exp1

ABSTRACT: The goal of these studies is to define the molecular signatures of TH1-induced EAE and TH17-induced EAE through adoptive transfer. We will also define the role of IL-17 signaling in the pathology by comparing cells derived from wild type mice to those derived from mice lacking Act1, a key adaptor required for IL-17 dependent signaling. Brains and spinal cords from animals at peak of disease will be profiled.

ORGANISM(S): Mus musculus

PROVIDER: GSE97035 | GEO | 2017/03/28

SECONDARY ACCESSION(S): PRJNA380640

REPOSITORIES: GEO

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Act1 modulates mRNA metabolism upon IL-17 stimulation

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IL-17-induced NF-kB activation via CIKS/Act1: Physiologic significance and signaling mechanisms

Project description:Interleukin-17 (IL-17) is essential in host defense against extracellular bacteria and fungi, especially at mucosal sites, but it also contributes significantly to inflammatory and autoimmune disease pathologies. Binding of IL-17 to its receptor leads to recruitment of the adaptor protein CIKS/Act1 via heterotypic association of their respective SEFIR domains and to activation of the transcription factor NF-kB; it is not known whether CIKS and/or NF-kB are required for all gene induction events. Here we report that CIKS is essential for all IL-17 induced immediate-early genes in primary mouse embryo fibroblasts, while NF-kB is profoundly involved. We also identify a novel sub-domain in the N-terminus of CIKS that is essential for IL-17-mediated NF-kB activation. This domain is both necessary and sufficient for the interaction between CIKS and TRAF6, an adaptor required for NF-kB activation. The ability of decoy peptides to block this interaction may provide a new therapeutic strategy for intervention in IL-17-driven autoimmune and inflammatory diseases. Keywords: strain comparisons strain comparisons

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Act1 modulates mRNA metabolism upon IL-17 stimulation

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Dual role of Act1 in keratinocyte differentiation and host defense: TRAF3IP2 silencing alters keratinocyte differentiation while inhibiting IL-17 responses

Project description:TRAF3IP2 is a candidate psoriasis susceptibility gene encoding Act1, a ubiquitin ligase that couples the IL-17 receptor to downstream signaling pathways. We investigated the role of Act1 in keratinocyte responses to IL-17 using a tetracycline inducible shRNA targeting TRAF3IP2. Tet exposure for seven days effectively silenced TRAF3IP2 mRNA and Act1 protein, resulting in 761 genes with significant changes in expression (495 down, 266 up, >1.5-fold, p<0.05). Gene Ontology analysis revealed that genes affected by TRAF3IP2 silencing are involved in epidermal differentiation, with early differentiation genes (KRT1, KRT10, DSC1, DSG1) being downregulated and late differentiation genes (SPRR2, SPRR3, LCE3) being upregulated. AP1 binding sites were enriched upstream of genes up-regulated by TRAF3IP2 silencing. Correspondingly, nuclear expression of FosB and Fra1 was increased in TRAF3IP2-silenced cells. Many genes involved in host defense were induced by IL-17 in a TRAF3IP2-dependent fashion. Inflammatory differentiation conditions (serum addition for 4 days postconfluence) markedly amplified these IL-17 responses, while increasing basal levels and TRAF3IP2 silencing-dependent upregulation of late differentiation genes. These findings suggest that TRAF3IP2 may alter both epidermal homeostasis and keratinocyte defense responses to influence psoriasis risk.

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