Heterochromatin-dependent gene silencing controls CD4 T cell response to Treg-mediated suppression [Tmem]
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PROVIDER: PRJNA1150523 | ENA |
REPOSITORIES: ENA
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Project description:The integrity of the organism depends on close and dynamic interactions between conventional and regulatory (Treg) T cells. The extracellular signals and signaling events that regulate this crosstalk have been extensively characterized. However, how conventional T cells translate Treg-dependent immunosuppressive signals at the chromatin level remains largely unknown. In differentiating CD4+ T helper (Th) cells, we and others previously reported that transcriptional specificity is largely controlled by heterochromatin-dependent gene silencing. We therefore hypothesized that Treg-mediated T cell suppression could also involve the repressive mark H3K9me3 and the histone-binding factor heterochromatin protein 1 (HP1). Using a bone marrow allograft model, in which graft rejection is coordinated by adoptively-transferred naive CD4+ T cells and can be inhibited by Treg, we show that Treg-dependent suppressive signals indeed mobilize HP1a to repress Th-cell effector genes. Unexpectedly, our screen also revealed that T cells deficient for HP1g or the lysine methyltransferase SUV39H1 are better tolerized than their wild-type counterparts. Mechanistically, our transcriptional and epigenetic profiling identified HP1g as a negative regulator of a network of genes functionally associated with T-cell anergy and exhaustion, including those encoding the transcription factor TOX and the inhibitory receptors PD-1, TIM-3 and LAG-3. In response to T cell receptor engagement, the expression of these immune checkpoints is deregulated in HP1g-deficient cells, thus promoting their better inhibition by Treg. Therefore, we demonstrate that H3K9me3-dependent epigenetic pathways critically regulate Th cell susceptibility to Treg-mediated suppression, and we identify HP1a and HP1g as new epigenetic players whose expression may be manipulated to restore protective immune responses or correct immunopathology, respectively.
2024-11-25 | GSE275355 | GEO
Project description:Heterochromatin-dependent gene silencing controls CD4 T cell response to Treg-mediated suppression.
| PRJNA1034951 | ENA
Project description:The integrity of the organism depends on close and dynamic interactions between conventional and regulatory (Treg) T cells. The extracellular signals and signaling events that regulate this crosstalk have been extensively characterized. However, how conventional T cells translate Treg-dependent immunosuppressive signals at the chromatin level remains largely unknown. In differentiating CD4+ T helper (Th) cells, we and others previously reported that transcriptional specificity is largely controlled by heterochromatin-dependent gene silencing. We therefore hypothesized that Treg-mediated T cell suppression could also involve the repressive mark H3K9me3 and the histone-binding factor heterochromatin protein 1 (HP1). Using a bone marrow allograft model, in which graft rejection is coordinated by adoptively-transferred naive CD4+ T cells and can be inhibited by Treg, we show that Treg-dependent suppressive signals indeed mobilize HP1a to repress Th-cell effector genes. Unexpectedly, our screen also revealed that T cells deficient for HP1g or the lysine methyltransferase SUV39H1 are better tolerized than their wild-type counterparts. Mechanistically, our transcriptional and epigenetic profiling identified HP1g as a negative regulator of a network of genes functionally associated with T-cell anergy and exhaustion, including those encoding the transcription factor TOX and the inhibitory receptors PD-1, TIM-3 and LAG-3. In response to T cell receptor engagement, the expression of these immune checkpoints is deregulated in HP1g-deficient cells, thus promoting their better inhibition by Treg. Therefore, we demonstrate that H3K9me3-dependent epigenetic pathways critically regulate Th cell susceptibility to Treg-mediated suppression, and we identify HP1a and HP1g as new epigenetic players whose expression may be manipulated to restore protective immune responses or correct immunopathology, respectively.
2024-11-25 | GSE246827 | GEO
Project description:Heterochromatin-dependent gene silencing controls CD4 T cell response to Treg-mediated suppression [ATAC-seq]
| PRJNA1034955 | ENA
Project description:The integrity of the organism depends on close and dynamic interactions between conventional and regulatory (Treg) T cells. The extracellular signals and signaling events that regulate this crosstalk have been extensively characterized. However, how conventional T cells translate Treg-dependent immunosuppressive signals at the chromatin level remains largely unknown. In differentiating CD4+ T helper (Th) cells, we and others previously reported that transcriptional specificity is largely controlled by heterochromatin-dependent gene silencing. We therefore hypothesized that Treg-mediated T cell suppression could also involve the repressive mark H3K9me3 and the histone-binding factor heterochromatin protein 1 (HP1). Using a bone marrow allograft model, in which graft rejection is coordinated by adoptively-transferred naive CD4+ T cells and can be inhibited by Treg, we show that Treg-dependent suppressive signals indeed mobilize HP1a to repress Th-cell effector genes. Unexpectedly, our screen also revealed that T cells deficient for HP1g or the lysine methyltransferase SUV39H1 are better tolerized than their wild-type counterparts. Mechanistically, our transcriptional and epigenetic profiling identified HP1g as a negative regulator of a network of genes functionally associated with T-cell anergy and exhaustion, including those encoding the transcription factor TOX and the inhibitory receptors PD-1, TIM-3 and LAG-3. In response to T cell receptor engagement, the expression of these immune checkpoints is deregulated in HP1g-deficient cells, thus promoting their better inhibition by Treg. Therefore, we demonstrate that H3K9me3-dependent epigenetic pathways critically regulate Th cell susceptibility to Treg-mediated suppression, and we identify HP1a and HP1g as new epigenetic players whose expression may be manipulated to restore protective immune responses or correct immunopathology, respectively.
2024-11-25 | GSE246829 | GEO
Project description:The integrity of the organism depends on close and dynamic interactions between conventional and regulatory (Treg) T cells. The extracellular signals and signaling events that regulate this crosstalk have been extensively characterized. However, how conventional T cells translate Treg-dependent immunosuppressive signals at the chromatin level remains largely unknown. In differentiating CD4+ T helper (Th) cells, we and others previously reported that transcriptional specificity is largely controlled by heterochromatin-dependent gene silencing. We therefore hypothesized that Treg-mediated T cell suppression could also involve the repressive mark H3K9me3 and the histone-binding factor heterochromatin protein 1 (HP1). Using a bone marrow allograft model, in which graft rejection is coordinated by adoptively-transferred naive CD4+ T cells and can be inhibited by Treg, we show that Treg-dependent suppressive signals indeed mobilize HP1a to repress Th-cell effector genes. Unexpectedly, our screen also revealed that T cells deficient for HP1g or the lysine methyltransferase SUV39H1 are better tolerized than their wild-type counterparts. Mechanistically, our transcriptional and epigenetic profiling identified HP1g as a negative regulator of a network of genes functionally associated with T-cell anergy and exhaustion, including those encoding the transcription factor TOX and the inhibitory receptors PD-1, TIM-3 and LAG-3. In response to T cell receptor engagement, the expression of these immune checkpoints is deregulated in HP1g-deficient cells, thus promoting their better inhibition by Treg. Therefore, we demonstrate that H3K9me3-dependent epigenetic pathways critically regulate Th cell susceptibility to Treg-mediated suppression, and we identify HP1a and HP1g as new epigenetic players whose expression may be manipulated to restore protective immune responses or correct immunopathology, respectively.
2024-11-25 | GSE246828 | GEO
Project description:Non-lymphoid tissues (NLTs) harbour a pool of adaptive immune cells distinct from their counterparts in lymphoid tissues, and their development and phenotype remains largely unexplored. We used scRNA-seq to survey CD4+ T regulatory (Treg) and memory T (Tmem) cells in spleen, lymph nodes, skin and colon in an unbiased way, in mouse. This cross-tissues comparison allows us to obtain marker genes for immune populations in specific locations, as well as examine each population's heterogeneity. Additionally, a continuous phenotype of Treg migration can be modelled from the mouse data, unravelling the transcriptional stages through which these cells transition between tissues.
2019-05-20 | E-MTAB-7311 | biostudies-arrayexpress
Project description:Non-lymphoid tissues (NLTs) harbour a pool of adaptive immune cells distinct from their counterparts in lymphoid tissues, and their development and phenotype remains largely unexplored. We used scRNA-seq to survey CD4+ T regulatory (Treg) and memory T (Tmem) cells in spleen, lymph nodes, skin and colon in an unbiased way, in mouse and human. This cross-tissues, cross-species comparison allows us to obtain marker genes for immune populations in specific locations with likely relevance for human studies. Additionally, a continuous phenotype of Treg migration can be modelled from the mouse data, unravelling the transcriptional stages through which these cells transition between tissues.
2018-12-31 | E-MTAB-6072 | biostudies-arrayexpress
Project description:Constitutive domains of repressive heterochromatin are maintained within the fission yeast genome through self-reinforcing mechanisms involving histone methylation and small RNAs. Non-coding RNAs generated from heterochromatic regions are processed into small RNAs by the RNA interference pathway, and are subject to silencing through both transcriptional and post-transcriptional mechanisms. While the pathways involved in maintenance of the repressive heterochromatin state are reasonably well understood, less is known about the requirements for its establishment. Here we describe a novel role for the post-transcriptional regulatory factor Mkt1 in establishment of heterochromatin at pericentromeres in fission yeast. Loss of Mkt1 does not affect maintenance of existing heterochromatin, but does affect its recovery following depletion, as well as de novo establishment of heterochromatin on a mini-chromosome. Pathway dissection revealed that Mkt1 is required for RNAi-mediated post-transcriptional silencing, downstream of small RNA production. Mkt1 physically associates with pericentromeric transcripts, and is additionally required for maintenance of silencing and heterochromatin at centromeres when transcriptional silencing is impaired. Our findings provide new insight into the mechanism of RNAi-mediated post-transcriptional silencing in fission yeast, and unveil an important role for post-transcriptional silencing in establishment of heterochromatin that is dispensable when full transcriptional silencing is imposed.
2019-11-28 | PXD015484 | Pride
Project description:Foxp3+ regulatory T (Treg) cells prevent inflammatory disease but the mechanistic basis of suppression is not understood completely . Gene silencing by RNA interference can act in a cell-autonomous and non-cell-autonomous manner, providing mechanisms of inter-cellular regulation. Here, we demonstrate that non-cell-autonomous gene silencing, mediated by miRNA-containing exosomes, is a mechanism employed by Treg cells to suppress T cell-mediated disease. Treg cells transferred microRNAs (miRNA) to various immune cells, including T helper 1 (Th1) cells, suppressing Th1 cell proliferation and cytokine secretion. Use of Dicer-deficient or Rab27a and Rab27b double-deficient Treg cells to disrupt miRNA-biogenesis or the exosomal pathway, respectively, established a requirement for miRNAs and exosomes for Treg cell-mediated suppression. Transcriptional analysis and miRNA inhibitor studies showed that exosome-mediated transfer of Let-7d from Treg cell to Th1 cells contributed to suppression and prevention of systemic disease. These studies reveal a mechanism of Treg cell-mediated suppression mediated by miRNA-containing exosomes. Regulatory T cells (CD4+CD25hiFoxp3rfp+, Treg) were isolated from naive mice. RNA as extracted form some Treg cells, while others were cultured in complete IMDM media for 3 days, stimulated with anti-CD3 anti-CD3 (1ug/ml) and anti-CD28 (10ug/ml). Exosomes were recovered from Treg cell supernatant, as described, and RNA was extracted form the purified exosomes. To identify which miRNAs were transferred to Dicer-deficient (KO) cells from Treg cells, we cultured Dicer KO cells alone, or co-cultured Dicer KO cells with Treg cells. RNA was extracted form Dicer KO cells cultured alone or from Dicer KO cells cultured in the presence of Treg cells. 3 x biological replicates were used. Each biological replicate was derived from a pool of 3-5 samples.
2014-08-27 | E-GEOD-60615 | biostudies-arrayexpress