Trained Immunity Causes Myeloid Cell Hypercoagulability
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1140546 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| SRR30004071_1.fastq.gz | Fastqsanger.gz | |||
| SRR30004071_2.fastq.gz | Fastqsanger.gz | |||
| SRR30004072_1.fastq.gz | Fastqsanger.gz | |||
| SRR30004072_2.fastq.gz | Fastqsanger.gz |
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Project description:Venous thromboembolism is common in individuals with chronic inflammatory diseases, but the pathogenic basis for this increased thrombotic risk remains poorly understood. Myeloid cell ‘trained immunity’ describes persistent innate immune cell memory arising from prior exposure to an inflammatory stimulus, leading to an enhanced immune response to subsequent unrelated stimuli. We identify enhanced myeloid cell prothrombotic activity as a novel maladaptive consequence of trained immunity. LPS stimulation of murine bone marrow-derived macrophages trained previously with either β-glucan or free haem exhibited significantly enhanced procoagulant and antifibrinolytic gene expression and activity compared to macrophages stimulated with LPS alone. The β-glucan training-mediated increase in activated myeloid cell procoagulant activity was mediated by enhanced acid sphingomyelinase-mediated tissue factor (TF) functional decryption. Furthermore, pre-treatment with methyltransferase and acetyltransferase inhibitors to erase epigenetic marks associated with innate immune memory diminished trained macrophage TF gene expression in β-glucan-trained macrophages. Functional analysis of splenic monocytes isolated from β-glucan-trained mice revealed enhanced procoagulant activity up to 4 weeks after β-glucan administration compared to monocytes from control mice over the same time period. Remarkably, monocyte procoagulant activity increased proportionately with time since β-glucan administration, before plateauing at 4 weeks. Furthermore, haematopoietic progenitor cells and bone marrow interstitial fluid isolated from β-glucan-trained mice possessed enhanced procoagulant activity compared to control mice. Trained immunity and associated metabolic perturbations may therefore represent novel therapeutic vulnerabilities in immunothrombotic disease development, opening new avenues for targeted intervention.
2025-03-07 | GSE273173 | GEO
Project description:Trained immunity occurs when inflammatory stimulation reprograms myeloid cells to have increased effector functions upon secondary stimulation. Interestingly, the secondary stimulation can occur well beyond the lifetime of an individual myeloid cell, thus memory of immune training must reside in the hematopoietic system. After showing that long-term hematopoietic stem cells (HSCLT) from mice treated with pristane for eight weeks generate trained macrophages, we sought to uncover mechanisms underlying the heritable trained immunity program in myeloid cells. To do this we transplanted HSCLT from pristane mice into congenic recipients, and after 18 weeks of engraftment we generated bone marrow derived macrophages (BMDMs) in vitro. We then analyzed the chromatin landscape and transcriptome using low input chromatin accessibility and transcriptomics sequencing (LiCAT-seq) which allows for the co-generation of RNA-seq and ATAC-seq libraries from the same cellular pool. With this approach we found a unique epigenetic phenotype of reduced chromatin accessibility at metabolic genes in BMDMs from pristane HSCLT, which resulted in reduced transcription of metabolic genes, leading to reduced metabolism in BMDMs.
2024-10-15 | GSE267569 | GEO
Project description:Trained immunity occurs when inflammatory stimulation reprograms myeloid cells to have increased effector functions upon secondary stimulation. Interestingly, the secondary stimulation can occur well beyond the lifetime of an individual myeloid cell, thus memory of immune training must reside in the hematopoietic system. After showing that long-term hematopoietic stem cells (HSCLT) from mice treated with pristane for eight weeks generate trained macrophages, we sought to uncover mechanisms underlying the heritable trained immunity program in myeloid cells. To do this we transplanted HSCLT from pristane mice into congenic recipients, and after 18 weeks of engraftment we generated bone marrow derived macrophages (BMDMs) in vitro. We then analyzed the chromatin landscape and transcriptome using low input chromatin accessibility and transcriptomics sequencing (LiCAT-seq) which allows for the co-generation of RNA-seq and ATAC-seq libraries from the same cellular pool. With this approach we found a unique epigenetic phenotype of reduced chromatin accessibility at metabolic genes in BMDMs from pristane HSCLT, which resulted in reduced transcription of metabolic genes, leading to reduced metabolism in BMDMs.
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Project description:Trained immunity refers to epigenetic and metabolic changes in innate immune cells following exposure to inflammatory signals, leading to a heightened response to secondary stimuli. Although this innate immune memory contributes to host defense against infections, it can also have maladaptive consequences in a broad range of immune-driven conditions. During the past decade, we have gained an increasingly better understanding of the molecular regulation of trained immunity, but the role of adaptive immune cells in modulation of trained immunity remains largely unknown. Here, we show that T cell interactions contribute to the induction of trained immunity in monocytes and that this mediated by CD40-TRAF6 signaling. Specifically, we found that inhibiting CD40-TRAF6 signaling prevents the induction of functional, transcriptomic, metabolic and epigenetic changes associated with trained immunity. Apart from detailed in vitro studies, we inhibited CD40-TRAF6 signaling in vivo in myeloid cells in a murine heart transplantation model which resulted in prolonged allograft survival. When the animals were additionally treated with costimulatory blockade by CTLA4-Ig, we observed immunological tolerance to the graft. Combined, our study reveals that trained immunity induction is regulated by CD40-TRAF6 signaling between myeloid and adaptive immune cells, and that this signaling can be efficiently leveraged for therapeutic purposes.
2024-08-26 | GSE228183 | GEO
Project description:Trained immunity refers to epigenetic and metabolic changes in innate immune cells following exposure to inflammatory signals, leading to a heightened response to secondary stimuli. Although this innate immune memory contributes to host defense against infections, it can also have maladaptive consequences in a broad range of immune-driven conditions. During the past decade, we have gained an increasingly better understanding of the molecular regulation of trained immunity, but the role of adaptive immune cells in modulation of trained immunity remains largely unknown. Here, we show that T cell interactions contribute to the induction of trained immunity in monocytes and that this mediated by CD40-TRAF6 signaling. Specifically, we found that inhibiting CD40-TRAF6 signaling prevents the induction of functional, transcriptomic, metabolic and epigenetic changes associated with trained immunity. Apart from detailed in vitro studies, we inhibited CD40-TRAF6 signaling in vivo in myeloid cells in a murine heart transplantation model which resulted in prolonged allograft survival. When the animals were additionally treated with costimulatory blockade by CTLA4-Ig, we observed immunological tolerance to the graft. Combined, our study reveals that trained immunity induction is regulated by CD40-TRAF6 signaling between myeloid and adaptive immune cells, and that this signaling can be efficiently leveraged for therapeutic purposes.
2024-08-26 | GSE228182 | GEO
Project description:Hydroxychloroquine inhibits trained immunity
| PRJNA670179 | ENA
Project description:Trained immunity occurs when inflammatory stimulation reprograms myeloid cells to have increased effector functions upon secondary stimulation. We found that autoimmune inflammation indiced trained immunity in bone marrow derived macrophages (BMDMs) in mice treated with pristane for eight weeks. We then analyzed the chromatin landscape and transcriptome using low input chromatin accessibility and transcriptomics sequencing (LiCAT-seq) which allows for the co-generation of RNA-seq and ATAC-seq libraries from the same cellular pool. With this approach we found that BMDMs had increased chromatin accessibility at metabolic genes and inflammatory related genes in BMDMs from pristane treated mice, which resulted in increased transcription of metabolic and inflammatory genes, leading to enhanced metabolism and inflammatory functions in BMDMs.
2024-10-15 | GSE267516 | GEO
Project description:Trained immunity occurs when inflammatory stimulation reprograms myeloid cells to have increased effector functions upon secondary stimulation. We found that autoimmune inflammation indiced trained immunity in bone marrow derived macrophages (BMDMs) in mice treated with pristane for eight weeks. We then analyzed the chromatin landscape and transcriptome using low input chromatin accessibility and transcriptomics sequencing (LiCAT-seq) which allows for the co-generation of RNA-seq and ATAC-seq libraries from the same cellular pool. With this approach we found that BMDMs had increased chromatin accessibility at metabolic genes and inflammatory related genes in BMDMs from pristane treated mice, which resulted in increased transcription of metabolic and inflammatory genes, leading to enhanced metabolism and inflammatory functions in BMDMs.
2024-10-15 | GSE267563 | GEO
Project description:We demonstrate that hydroxychloroquine inhibits trained immunity at the functional and epigenetic level and is accompanied by reduced expression of interferon-stimulated genes. Trained immunity comprises a functional adaptation induced by epigenetic reprogramming which facilitates the anti-viral innate immune response.
2020-10-21 | GSE159678 | GEO
Project description:scRNAseq of monocytes from in vitro Trained immunity experiments stimulated by β-glucan (BG), uric acid (UA), muramyl dipeptide (MDP), oxidized low-density lipoprotein (oxLDL), or RPMI-Control, and respective samples restimulated with Lipopolysaccharide (LPS).
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