Histone Deacetylase Inhibitors Modulate Interleukin 6-dependent CD4+ T Cell Polarization in Vitro and in Vivo
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Authors: | Rainer Glauben Elena Sonnenberg Martin Wetzel Paolo Mascagni Britta Siegmund |
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Affiliation: | From the ‡Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Medical Department I, 12200 Berlin, Germany and ;the §Center for Research, Italfarmaco, S.p.A., Cinisello Balsamo 20092, Italy |
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Abstract: | Histone deacetylase (HDAC) inhibitors have been associated primarily with an anti-proliferative effect in vitro and in vivo. Recent data provide evidence for an anti-inflammatory potency of HDAC inhibitors in models of experimental colitis. Because the balance of T cell subpopulations is critical for the balance of the mucosal immune system, this study explores the regulatory potency of HDAC inhibitors on T cell polarization as a mechanistic explanation for the observed anti-inflammatory effects. Although HDAC inhibition suppressed the polarization toward the pro-inflammatory T helper 17 (Th17) cells, it enhanced forkhead box P3 (FoxP3)+ regulatory T cell polarization in vitro and in vivo at the site of inflammation in the lamina propria. This was paralleled by a down-regulation of the interleukin 6 receptor (IL-6R) on naïve CD4+ T cells on the mRNA as well as on the protein level and changes in the chromatin acetylation at the IL6R gene and its promoter. Downstream of the IL-6R, HDAC inhibition was followed by a decrease in STAT3 phosphorylation as well as retinoic acid receptor-related orphan receptor γT (RORγT) expression, thus identifying the IL-6/STAT3/IL-17 pathway as an important target of HDAC inhibitors. These results directly translated to experimental colitis, where IL-6R expression was suppressed in naïve T cells, paralleled by a significant reduction of Th17 cells in the lamina propria of ITF2357-treated animals, resulting in the amelioration of disease. This study indicates that, in experimental colitis, inhibition of HDAC exerts an anti-inflammatory potency by directing T helper cell polarization via targeting the IL-6 pathway. |
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Keywords: | Colitis Histone Deacetylase Inhibitors Inflammatory Bowel Disease Macrophages STAT3 IL-6R Il-17 T Helper Cells Promoter Acetylation |
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