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SUMOylation of ROR-gt inhibit IL-17 expression and inflamatiion

ABSTRACT: SUMOylation of ROR-gt inhibit IL-17 expression and inflamatiion

PROVIDER: PRJNA478420 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7450390_1.fastq.gz	Fastqsanger.gz
	SRR7450390_2.fastq.gz	Fastqsanger.gz
	SRR7450391_1.fastq.gz	Fastqsanger.gz
	SRR7450391_2.fastq.gz	Fastqsanger.gz
	SRR7450392_1.fastq.gz	Fastqsanger.gz

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SUMOylation of ROR-gt inhibit IL-17 expression and inflamatiion

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Microarray analysis of wildtype, Klf8gt/gt, Klf3-/- and Klf3-/- Klf8gt/gt TER119+ E13.5 fetal liver cells

Project description:The aim of this experiment was to investigate the regulation of gene expression by KLF3 and KLF8 in fetal erythroid cells by analyzing single and double mutant mouse models. Affymetrix microarrays were performed on RNA from TER119+ fetal liver cells from E13.5 wildtype, Klf8gt/gt, Klf3-/- and Klf3-/- Klf8gt/gt mice. Four wildtype replicates, four Klf8gt/gt replicates, three Klf3-/- replicates and four Klf3-/- Klf8gt/gt replicates of E13.5 TER119+ fetal liver cell samples, litter-matched where possible.

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Project description:Post-translational modification with SUMO is known to regulate the activity of transcription factors, but how SUMOylation of individual proteins might influence immunity is mostly unexplored. The NFAT transcription factors play an essential role in antigen receptor-mediated gene regulation. SUMOylation of NFATc1 represses IL-2 in vitro, but its role in T cell-mediated immune responses in vivo is not clear. To this end, we generated a novel Nfatc1 transgenic mouse, which prevents SUMO modification of NFATc1. Avoidance of NFATc1 SUMOylation ameliorated experimental autoimmune encephalomyelitis as well as graft-versus-host disease. An elevated IL-2 production promoted Treg expansion and suppressed autoreactive or alloreactive T cells. Mechanistically, increased IL-2 secretion counteracted IL-17 and IFN-γ expression through STAT5 and Blimp-1 induction. Then, Blimp-1 repressed IL-2 itself and the as well induced, proliferation-associated survival factor Bcl2A1. Collectively, we demonstrate that prevention of NFATc1 SUMOylation fine-tunes T-cell responses towards lasting tolerance. Thus, targeting NFATc1 SUMOylation presents a novel and promising strategy to treat T cell-mediated inflammatory diseases.

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Project description:Post-translational modification with SUMO is known to regulate the activity of transcription factors, but how SUMOylation of individual proteins might influence immunity is mostly unexplored. NFATc1 is a transcription factor of the family of ‘Nuclear Factors of Activated T-cells’ which plays an essential role in antigen receptor-mediated gene regulation. It is expressed in multiple isoforms of which the longer isoforms can be modified by SUMOylation. SUMO modification of NFATc1 represses IL-2 in vitro, but its role in T cell-mediated immune responses in vivo is not clear. To this end, we generated a novel Nfatc1 transgenic mouse with lysine to arginine mutations, which abolish the SUMO modification within NFATc1’s C-terminal domain. Inhibition of NFATc1 SUMOylation ameliorated experimental autoimmune encephalomyelitis as well as graft-versus-host disease. This was due to elevated IL-2 production that promoted Treg expansion and suppressed autoreactive or alloreactive T cells. Mechanistically, increased IL-2 secretion counteracted IL-17 and IFN-γ expression through STAT5 and Blimp-1 induction. Blimp-1 also repressed IL-2 itself and the as well induced survival factor Bcl2A1. Still, lack of NFATc1 sumoylation fine-tunes T-cell responses towards lasting tolerance implying a novel approach to treat inflammatory diseases.

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