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Autoregulation of Th1-mediated inflammation by twist1.

ABSTRACT: The basic helix-loop-helix transcriptional repressor twist1, as an antagonist of nuclear factor kappaB (NF-kappaB)-dependent cytokine expression, is involved in the regulation of inflammation-induced immunopathology. We show that twist1 is expressed by activated T helper (Th) 1 effector memory (EM) cells. Induction of twist1 in Th cells depended on NF-kappaB, nuclear factor of activated T cells (NFAT), and interleukin (IL)-12 signaling via signal transducer and activator of transcription (STAT) 4. Expression of twist1 was transient after T cell receptor engagement, and increased upon repeated stimulation of Th1 cells. Imprinting for enhanced twist1 expression was characteristic of repeatedly restimulated EM Th cells, and thus of the pathogenic memory Th cells characteristic of chronic inflammation. Th lymphocytes from the inflamed joint or gut tissue of patients with rheumatic diseases, Crohn's disease or ulcerative colitis expressed high levels of twist1. Expression of twist1 in Th1 lymphocytes limited the expression of the cytokines interferon-gamma, IL-2, and tumor necrosis factor-alpha, and ameliorated Th1-mediated immunopathology in delayed-type hypersensitivity and antigen-induced arthritis.

SUBMITTER: Niesner U

PROVIDER: S-EPMC2525589 | biostudies-literature | 2008 Aug

REPOSITORIES: biostudies-literature

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Autoregulation of Th1-mediated inflammation by twist1.

Niesner Uwe U Albrecht Inka I Janke Marko M Doebis Cornelia C Loddenkemper Christoph C Lexberg Maria H MH Eulenburg Katharina K Kreher Stephan S Koeck Juliana J Baumgrass Ria R Bonhagen Kerstin K Kamradt Thomas T Enghard Philipp P Humrich Jens Y JY Rutz Sascha S Schulze-Topphoff Ulf U Aktas Orhan O Bartfeld Sina S Radbruch Helena H Hegazy Ahmed N AN Löhning Max M Baumgart Daniel C DC Duchmann Rainer R Rudwaleit Martin M Häupl Thomas T Gitelman Inna I Krenn Veit V Gruen Joachim J Sieper Jochen J Zeitz Martin M Wiedenmann Bertram B Zipp Frauke F Hamann Alf A Janitz Michal M Scheffold Alexander A Burmester Gerd R GR Chang Hyun D HD Radbruch Andreas A

The Journal of experimental medicine 20080728 8

The basic helix-loop-helix transcriptional repressor twist1, as an antagonist of nuclear factor kappaB (NF-kappaB)-dependent cytokine expression, is involved in the regulation of inflammation-induced immunopathology. We show that twist1 is expressed by activated T helper (Th) 1 effector memory (EM) cells. Induction of twist1 in Th cells depended on NF-kappaB, nuclear factor of activated T cells (NFAT), and interleukin (IL)-12 signaling via signal transducer and activator of transcription (STAT) ...[more]

PMID: 18663125

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Project description:Gene expression profiling of repeatedly activated compared to recently activated Th1 cells to identify genes that play a role in chronic inflammatory disorders and may qualify as diagnostic or therapeutic targets; ; Upon activation under appropriate costimulatory conditions, naive T helper (Th) cells differentiate into Th2 or Th17 cells, each characterized by the expression of specific effector cytokines. In response to a repeated stimulation with antigen, Th cells develop a stable memory for the expression of those cytokines as well as for other secreted or membrane-associated factors. The stable memory for the expression of proinflammatory effector functions may explain the resistance of Th effector cells to conventional immunosuppressive therapy, and the inability of immunosuppression to cure chronic inflammation. The imprinting of the functional memory is based on epigenetic modifications and expression of distinct transcription factors. In this project, we compare the transcriptomes of once and repeatedly activated murine Th1 cells, to identify genes that induce and maintain the functional memory and control the persistence of pathogenic memory Th1 cells. This in turn might help to discriminate pathogenic versus protective cells in immunopathology and present novel targets for the diagnosis and therapy of chronic inflammatory disease. Experiment Overall Design: Genes differentially expressed in once versus four times stimulated Th1 cells. In vitro polarization of murine naÃ¯ve DO11.10 T cells towards Th1 direction (5 ng/ml recombinant murine IL-12, 5 Î¼g/ml anti-IL-4 antibody) with antigenic stimulation (ova323-339 and irradiated splenic APCs). The transcriptional profiles of resting one week old Th1 (Th1 1w) cells and resting 4 week old Th1 (Th1 4w) cells were compared using Affymetrix Murine Genome (MG) U74V2A GeneChip arrays. Experiment Overall Design: 10 Âµg of total RNA from each cell sample was reverse transcribed using T7-(d)T24 primer and SuperScript II reverse transcriptase Experiment Overall Design: cDNA extraction with a PhaseLock gel (Eppendorf), and precipitation with ethanol and ammonium acetate Experiment Overall Design: Biotinylated cRNA was transcribed with the MEGAscript high yield transcription kit (Ambion), fragmented, and the hybridization cocktail was prepared (15 Âµg fragmented biotin-labeled cRNA spiked with Eukaryotic Hybridization control) Experiment Overall Design: probes were subsequently hybridised with the GeneChip U74Av2 for 16 hrs at 45 oC Experiment Overall Design: after washing the hybridisation signals were visualised by staining with streptavidin-phycoerythrin and amplification with an anti-streptavidin antibody Experiment Overall Design: TH1_1w_C1; TH1_1w_C2; TH1_1w_C3TH1_4w_C1; TH1_4w_C2; TH1_4w_C3 Experiment Overall Design: 1w: 1 week in culture; 4w: 4 weeks in culture; C1-3: Culture or Experiment No.

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Autoregulation of Th1-mediated inflammation by twist1.

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Autoregulation of Th1-mediated inflammation by twist1.

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