DNMT3A clonal hematopoiesis-driver mutations induce cardiac fibrosis by paracrine activation of fibroblasts
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PROVIDER: PRJEB66478 | ENA |
REPOSITORIES: ENA
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Project description:Hematopoietic mutations in epigenetic regulators like DNA methyltransferase 3 alpha (DNMT3A) drive clonal hematopoiesis of indeterminate potential (CHIP) and are associated with adverse prognosis in patients with heart failure (HF). The interactions between CHIP-mutated cells and other cardiac cell types remain unknown. Here, we identify fibroblasts as potential interaction partners of CHIP-mutated monocytes using combined transcriptomic data from peripheral blood mononuclear cells of HF patients with and without CHIP and cardiac tissue. We demonstrate that DNMT3A inactivation augments macrophage-to-cardiac fibroblasts interactions and induces cardiac fibrosis in mice and humans. Mechanistically, DNMT3A inactivation increases the release of heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF) to activate cardiac fibroblasts. These findings not only identify a novel pathway of DNMT3A CHIP-driver mutation-induced instigation and progression of HF, but may also provide a rationale for the development of new anti-fibrotic strategies.
2023-10-20 | E-MTAB-13384 | biostudies-arrayexpress
Project description:Accumulation of fatty bone marrow (FBM) is one of the key age related changes possibly influencing the blood system. While a link between obesity and cancer evolution has been reported it remains unknown whether FBM can modify the evolution of the early stages of leukemia and clonal hematopoiesis (CH). To address this question, we established different FBM mouse models in immunodeficient mice in whom we can study both mouse and human cells. We focused our studies on two FBM models: 1) after sublethal irradiation; 2) after castration; and in both we used an adipogenesis inhibitor as a control (PPARγ inhibitor). We transplanted both human and mice hematopoietic stem cells (HSCs) carrying DNMT3A mutations into immunodeficient mice with FBM. A significant increase in self-renewal was found when DNMT3AMut-HSCs were exposed to FBM. To better understand the mechanisms of the FBM-CH interaction, we performed single cell RNA-sequencing on HSPCs after FBM exposure in vivo. A 6-10 fold increase in DNMT3AMut-HSCs was observed under FBM conditions in comparison to normal bone marrow. Mutated HSCs from mice exposed to FBM exhibited an activated inflammatory signaling (IL-6 and IFNγ). Cytokine analysis of BM fluid and BM derived adipocytes grown in vitro demonstrated increased IL-6 levels under FBM conditions. Anti-IL-6 neutralizing antibodies significantly reduced the selective advantage of mice derived DNMT3AMut-HSCs exposed to FBM. Overall, paracrine FBM inflammatory signals promote DNMT3A-driven clonal hematopoiesis, which can be inhibited by blocking the IL-6 receptor.
2023-02-19 | E-MTAB-12614 | biostudies-arrayexpress
Project description:Accumulation of fatty bone marrow (FBM) is one of the key age related changes possibly influencing the blood system. While a link between obesity and cancer evolution has been reported it remains unknown whether FBM can modify the evolution of the early stages of leukemia and clonal hematopoiesis (CH). To address this question, we established different FBM mouse models in immunodeficient mice in whom we can study both mouse and human cells. We focused our studies on two FBM models: 1) after sublethal irradiation; 2) after castration; and in both we used an adipogenesis inhibitor as a control (PPARγ inhibitor). We transplanted both human and mice hematopoietic stem cells (HSCs) carrying DNMT3A mutations into immunodeficient mice with FBM. A significant increase in self-renewal was found when DNMT3AMut-HSCs were exposed to FBM. To better understand the mechanisms of the FBM-CH interaction, we performed single cell RNA-sequencing on HSPCs after FBM exposure in vivo. A 6-10 fold increase in DNMT3AMut-HSCs was observed under FBM conditions in comparison to normal bone marrow. Mutated HSCs from mice exposed to FBM exhibited an activated inflammatory signaling (IL-6 and IFNγ). Cytokine analysis of BM fluid and BM derived adipocytes grown in vitro demonstrated increased IL-6 levels under FBM conditions. Anti-IL-6 neutralizing antibodies significantly reduced the selective advantage of mice derived DNMT3AMut-HSCs exposed to FBM. Overall, paracrine FBM inflammatory signals promote DNMT3A-driven clonal hematopoiesis, which can be inhibited by blocking the IL-6 receptor.
2023-02-19 | E-MTAB-12613 | biostudies-arrayexpress
Project description:Somatic mutations in DNA Methyltransferase 3A (DNMT3A) with a hotspot in exon 23 at Arginine 882 (DNMT3AR882mut) are the most frequent single mutations in clonal hematopoiesis. Here we analyze the expression of genes and endogenous retrovirus (ERV) sequences in a murine model carrying human DNMT3A-R882H mutation in one allele of the endogenous DNMT3A with respect to normal condition and azacitidine treatment.
2021-01-26 | GSE146907 | GEO
Project description:Accumulation of fatty bone marrow (FBM) is one of the key age related changes possibly influencing the blood system. While a link between obesity and cancer evolution has been reported it remains unknown whether FBM can modify the evolution of the early stages of leukemia and clonal hematopoiesis (CH). To address this question, we established different FBM mouse models in immunodeficient mice in whom we can study both mouse and human cells. We focused our studies on two FBM models: 1) after sublethal irradiation; 2) after castration; and in both we used an adipogenesis inhibitor as a control (PPARγ inhibitor). We transplanted both human and mice hematopoietic stem cells (HSCs) carrying DNMT3A mutations into immunodeficient mice with FBM. A significant increase in self-renewal was found when DNMT3AMut-HSCs were exposed to FBM. To better understand the mechanisms of the FBM-CH interaction, we performed single cell RNA-sequencing on HSPCs after FBM exposure in vivo. A 6-10 fold increase in DNMT3AMut-HSCs was observed under FBM conditions in comparison to normal bone marrow. Mutated HSCs from mice exposed to FBM exhibited an activated inflammatory signaling (IL-6 and IFNγ). Cytokine analysis of BM fluid and BM derived adipocytes grown in vitro demonstrated increased IL-6 levels under FBM conditions. Anti-IL-6 neutralizing antibodies significantly reduced the selective advantage of mice derived DNMT3AMut-HSCs exposed to FBM. Overall, paracrine FBM inflammatory signals promote DNMT3A-driven clonal hematopoiesis, which can be inhibited by blocking the IL-6 receptor.
2023-02-19 | E-MTAB-12620 | biostudies-arrayexpress
Project description:Clonal hematopoiesis of indeterminate potential (CHIP) is caused by somatic mutations in hematopoietic stem cells and is associated with worse prognosis in heart failure patients. Patients harboring CHIP mutations show enhanced inflammation. However, whether these signatures are derived from the relatively low number of cells harboring mutations or are indicators of a systemic pro-inflammatory activation that is associated with CHIP is unclear. In this study, we assessed the cell-intrinsic effects of CHIP mutant-carrying cells in patients with heart failure. Using an improved protocol to detect mutant cells on a single cell level (MutDetect-Seq), we show that DNMT3A mutant monocytes exhibit altered gene expression profiles associated with inflammation and phagolysosome function. Gene expression was also significantly altered in DNMT3A mutant CD4+ T cells and NK cells, but not CD8 T cells. DNMT3A silenced CD4+ T cells and NK cells showed increased effector functions. Moreover, increased paracrine signaling pathways are predicted and validated between mutated and wild monocytes and T cells, which amplify inflammatory circuits. Taken together, these data provide novel insights into how CHIP might promote worse prognosis in heart failure patients.
2023-06-15 | E-MTAB-13016 | biostudies-arrayexpress
Project description:Inflammatory signals from fatty bone marrow support DNMT3a-driven clonal hematopoiesis (Dnmt3A KI heterozygote subset)
| PRJEB59817 | ENA
Project description:Inflammatory signals from fatty bone marrow support DNMT3a-driven clonal hematopoiesis (wt/DNMT3A KI subset)
| PRJEB59818 | ENA
Project description:Driver somatic mutations in adult acute myeloid leukemia (AML) may be preceded by a benign state termed clonal hematopoiesis (CH). To develop therapeutic strategies to prevent leukemia development from CH, it is important to understand the mechanisms by which CH-driving and AML-driving mutations cooperate. Here, we utilize mice with inducible mutant alleles common in CH (DNMT3AR882; mouse Dnmt3aR878H/+) and AML (NPM1c; mouse Npm1cA/+). We find that Dnmt3aR878H/+ hematopoietic stem cells (HSCs), but not multipotent progenitor cell (MPP) subsets, have reduced expression of cytokine and pro-inflammatory transcriptional signatures and a functional competitive advantage over their wild-type counterparts. These Dnmt3aR878H/+ HSCs are transformed by activation of Npm1cA/+, generating myeloid malignancies in which few additional cooperating somatic mutation events were detected. At a molecular level, Npm1cA/+ acutely increased accessibility of a distinct set of promoters in cooperation with Dnmt3aR878H/+ than it did as a single mutation. These promoters were enriched for pro-inflammatory response signatures, p53 pathway, DNA repair and targets of transcription factors implicated in AML, including Hmgb1 and Pax4. These results suggest cooperativity between pre-existing Dnmt3a mutation and Npm1 mutation at the chromatin level, where specific loci altered in accessibility by the Npm1 mutation are dependent on Dnmt3a mutation status. These findings have implications for biological understanding and therapeutic intervention of the transformation from CH to AML.
2022-01-21 | GSE193720 | GEO
Project description:Clonal hematopoiesis (CH) reflects clonal expansion of blood stem and progenitor cells with somatic mutations. We leveraged multi-modality single-cell sequencing to capture mutation status together with the transcriptome and methylome of CD34+ hematopoietic progenitor cells from five individuals with DNMT3A R882-mutated CH.
2022-07-05 | GSE158067 | GEO