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RNAseq of Mouse Embryonic Fibroblasts(MEFs) stimulated by IL-17

ABSTRACT: The IL-17 receptor adaptor molecule Act1, an RNA binding protein, plays a critical role in IL-17-mediated cancer progression. Here we report a novel mechanism for how IL-17/Act1 induces chemoresistance by modulating redox homeostasis through epitranscriptomic regulation of antioxidant RNA metabolism. Transcriptome-wide mapping of direct Act1-RNA interactions revealed that Act1 binds to the 5'UTR of antioxidant mRNAs and Wilms' tumor 1-associating protein (WTAP), a key regulator in m6A methyltransferase complex. Strikingly, Act1's binding sites are located in proximity to m6A modification sites, which allows Act1 to promote the recruitment of elF3G for cap-independent translation. Loss of Act1’s RNA binding activity or Wtap knockdown abolished IL-17-induced m6A modification and translation of Wtap and antioxidant mRNAs, indicating a feedforward mechanism of Act1-WTAP loop. We then developed antisense oligonucleotides (Wtap ASO) that specifically disrupts Act1’s binding to Wtap mRNA, abolishing IL-17/Act1-WTAP-mediated antioxidant protein production during chemotherapy. Wtap ASO substantially increased the antitumor efficacy of cisplatin, demonstrating a potential therapeutic strategy for chemoresistance.

ORGANISM(S): Mus musculus

PROVIDER: GSE263596 | GEO | 2024/06/06

REPOSITORIES: GEO

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Act1 modulates mRNA metabolism upon IL-17 stimulation

Project description:The IL-17 receptor adaptor molecule Act1, an RNA binding protein, plays a critical role in IL-17-mediated cancer progression. Here we report a novel mechanism for how IL-17/Act1 induces chemoresistance by modulating redox homeostasis through epitranscriptomic regulation of antioxidant RNA metabolism. Transcriptome-wide mapping of direct Act1-RNA interactions revealed that Act1 binds to the 5'UTR of antioxidant mRNAs and Wilms' tumor 1-associating protein (WTAP), a key regulator in m6A methyltransferase complex. Strikingly, Act1's binding sites are located in proximity to m6A modification sites, which allows Act1 to promote the recruitment of elF3G for cap-independent translation. Loss of Act1’s RNA binding activity or Wtap knockdown abolished IL-17-induced m6A modification and translation of Wtap and antioxidant mRNAs, indicating a feedforward mechanism of Act1-WTAP loop. We then developed antisense oligonucleotides (Wtap ASO) that specifically disrupts Act1’s binding to Wtap mRNA, abolishing IL-17/Act1-WTAP-mediated antioxidant protein production during chemotherapy. Wtap ASO substantially increased the antitumor efficacy of cisplatin, demonstrating a potential therapeutic strategy for chemoresistance.

2024-06-06 | GSE263835 | GEO

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.

2017-08-21 | GSE86451 | GEO

Systematic analysis of IL-17 receptor signalosome reveals a robust regulatory feedback loop

Project description:IL-17 mediates immune protection from fungi and bacteria as well as it promotes autoimmune pathologies. However, the regulation of the signal transduction from the IL-17 receptor (IL-17R) remained elusive. We developed a novel mass spectrometry-based approach to identify components of the IL-17R complex followed by analysis of their roles using reverse genetics. Besides the identification of LUBAC as an important signal transducing component of IL-17R, we established that IL-17 signaling is regulated by a robust negative feedback loop mediated by TBK1 and IKKε. These kinases terminate IL-17 signaling by phosphorylating the adaptor ACT1 leading to the release of the essential ubiquitin ligase TRAF6 from the complex. NEMO recruits both kinases to the IL-17R complex, documenting that NEMO has an unprecedented negative function in IL-17 signaling, distinct from its role in NF-κB activation. Our study provides a comprehensive view of the molecular events of the IL-17 signal transduction and its regulation.

2020-07-15 | PXD019020 | Pride

A novel RNA m6A modulator Zc3h13 plays an anchor role in facilitating nuclear RNA methylation and mouse embryonic stem cell self-renewal

Project description:N6-methyladenosine (m6A) is an abundant modification in eukaryotic mRNA, regulating mRNA dynamics by influencing mRNA stability, splicing, export and translation. Recent studies discovered m6A methyltransferases (?writer?), demethylases (?eraser?) and binding proteins (?reader?), which modulate m6A methylation. However, the precise m6A regulating machinery still remains incompletely understood. Here we demonstrate that ZC3H13, a zinc finger protein, plays an essential role in modulating m6A methylation on polyadenylated RNA in the nucleus. ZC3H13 exists in an evolutionary-conserved macromolecular complex containing WTAP, Virilizer and Hakai. We confirm the interaction among those proteins and demonstrate that knockdown of Zc3h13 in mouse embryonic stem cell (mESC) significantly decreases global m6A level on mRNA, mainly at 3? untranslated regions (3? UTR). Interestingly, fractionation assays show that upon Zc3h13 knockdown a great majority of WTAP, Virilizer and Hakai translocate to the cytoplasm and the nuclear presence of the methyltransferase Mettl3 and Mettl14 also decrease significantly. In contrast, knockdown of WTAP, Virilizer or Hakai does not change the nuclear localization of Zc3h13. This suggests that Zc3h13 is required for nuclear localization of the Zc3h13-WTAP-Virilizer-Hakai complex, which is important for RNA m6A methylation. Finally, Zc3h13 depletion, as does WTAP, Virilizer or Hakai, impairs self-renewal and triggers mESC differentiation. Taken together, our findings demonstrate that Zc3h13 plays an essential role in anchoring WTAP, Virilizer and Hakai in the nucleus to facilitate m6A methylation and to regulate mESC self-renewal.

2018-03-14 | GSE94148 | GEO

Identification of LncRNA TRAF3IP2-AS1 as a key regulator of IL-17 signaling through the SRSF10-IRF1-Act1 axis in autoimmune diseases

Project description:Our study indicates that lncRNA TRAF3IP2-AS1 serving as a negative regulator of Act1 transcriptional expression and IL-17 signaling pathway activity,recruits SRSF10 to downregulate the transcription of IRF1, which is itself a transcriptional factor for Act1. And the psoriasis-susceptible variant A4165G of TRAF3IP2-AS1 is a gain-of-function mutant that binds more strongly than the wild-type form to SRSF10. It means that TRAF3IP2-AS1 or SRSF10 may be a good target for the treatment of human IL-17-related autoimmune diseases.

2021-01-30 | GSE165781 | GEO

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

2011-10-18 | E-GEOD-24873 | biostudies-arrayexpress

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

2011-10-19 | GSE24873 | GEO

Identification and Characterization of the Mammalian Nuclear RNA N6-Adenosine Methyltransferase Core Complex

Project description:N6-methyladenosine (m6A) is the most prevalent internal modification found in mammalian messenger and non-coding RNAs. The discoveries of functionally significant demethylases that reverse this methylation as well as the recently revealed m6A distributions in mammalian transcriptomes strongly indicate regulatory functions of this modification. Here we report the identification and characterization of the mammalian nuclear RNA N6-adenosine methyltransferase core (RNMTC) complex. Besides METTL3, a methyltransferase which was the only known component of RNMTC in the past, we discovered that a previously uncharacterized methyltransferase, METTL14, exhibits a N6-adenosine methyltransferase activity higher than METTL3. Together with WTAP, the third component that dramatically affects the cellular m6A level, these three proteins form the core complex that orchestrates m6A deposition on mammalian nuclear RNA. Biochemistry assays, imaging experiments, as well as transcriptome-wide analyses of the binding sites and their effects on m6A methylation support methylation function and reveal new insights of RNMTC. PAR-CLIP and m6A-seq in HeLa cells

2013-11-29 | E-GEOD-46705 | biostudies-arrayexpress

IMM_Cleveland LiXX_EAE-Th1 or Th17_Act1 ko mouse_CNS_exp1

Project description: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.

2017-03-28 | GSE97035 | GEO

N6-methyladenosine Modulates Messenger RNA Translation Efficiency

Project description:N6-methyladenosine (m6A) is the most abundant internal messenger (mRNA) modification in mammalian mRNA. This modification is reversible and non-stoichiometric, which potentially adds an additional layer of variety and dynamic control of mRNA metabolism. The m6A-modified mRNA can be selectively recognized by the YTH family “reader” proteins. The preferential binding of m6A-containing mRNA by YTHDF2 is known to reduce the stability of the target transcripts; however, the exact effects of m6A on translation has yet to be elucidated. Here we show that another m6A reader protein, YTHDF1, promotes ribosome loading of its target transcripts. YTHDF1 forms a complex with translation initiation factors to elevate the translation efficiency of its bound mRNA. In a unified mechanism of translation control through m6A, the YTHDF2-mediated decay controls the lifetime of target transcripts; whereas, the YTHDF1-based translation promotion increases the translation efficiency to ensure effective protein production from relatively short-lived transcripts that are marked by m6A. PAR-CLIP and RIP was used to identify YTHDF1 binding sites followed by ribosome profling and RNA seq to assess the consequences of YTHDF1 siRNA knock-down

2015-06-09 | E-GEOD-63591 | biostudies-arrayexpress

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