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Single cell analysis in the adult bone marrow vascular niche after irradiation in Vegfc deleted mice

ABSTRACT: Single cell analysis in the adult bone marrow vascular niche after irradiation in Vegfc deleted mice

PROVIDER: PRJNA642107 | ENA |

REPOSITORIES: ENA

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Single cell analysis in the adult bone marrow vascular niche after irradiation in Vegfc deleted mice

Project description:To analyze the role of VEGF-C in the adult bone marrow vascular niche after irradiation

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Single cell analysis in the adult bone marrow vascular niche after Vegfc deletion

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Single cell analysis in the adult bone marrow vascular niche after Vegfc deletion

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Macrophage-produced VEGFC is induced by efferocytosis to resolve inflammation and improve ventricular function after myocardial infarction (ChIP-Seq)

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Cardiovascular disease perturbs the vascular hematopoietic stem cell niche

Project description:Hematopoiesis advances cardiovascular disease by generating inflammatory leukocytes that attack the arteries, heart and brain. While it is well documented that the bone marrow niche regulates hematopoietic stem cell proliferation and hence the systemic leukocyte pool, it is less clear how cardiovascular disease affects the vasculature forming this niche. Here we show that arterial hypertension, atherosclerosis and myocardial infarction alter the anatomy and function of bone marrow vasculature. Hypertension and atherosclerosis instigated vascular fibrosis, leakage and endothelial dysfunction in the bone marrow. Myocardial infarction induced vascular leakage and bone marrow angiogenesis via Vegf signaling. Endothelial cell-specific deletion of the Vegf receptor 2 limited emergency hematopoiesis after myocardial infarction, indicating that new vasculature supports higher blood cell production. RNA-sequencing of bone marrow endothelial cells revealed inflammatory gene expression in mice with cardiovascular disease. Endothelial cell-specific deletion of interleukin 6 or versican, which were highly expressed in mice with atherosclerosis or myocardial infarction, respectively, reduced hematopoiesis and systemic myeloid cells. Taken together, cardiovascular disease affects the vascular bone marrow niche, thus influencing hematopoietic stem cell behavior and expanding innate immune cell supply to atherosclerotic plaque and ischemic myocardium. Interrupting this feed back loop may constrain cardiovascular inflammation.

2021-09-27 | GSE144498 | GEO

Vascular niche induction of hematopoietic progenitors from pluripotent stem cells

Project description:Pluripotent stem cells (PSC) represent an alternative source of hematopoietic stem cells (HSCs). Clinical translation is impeded by limited engraftment of human (h)PSC-multipotent progenitor cells (MPP). This barrier suggests that additional cues are required for definitive hematopoiesis. We hypothesized that vascular niche producing Notch ligands Jagged-1 (JAG1) and Delta-like ligand-4 (DLL4) would drive definitive hematopoiesis. To test our hypothesis, hes2 human embryonic stem cells (hESC) 2 and Macaca nemestrina (Mn) iPSC line-7 were differentiated with cytokines Â± endothelial cells (EC), which express JAG1 and DLL4. EC co-culture supported emergence of 8-fold more CD34+CD45+ cells compared to co-culture with cytokines Â± ECs with JAG1 or DLL4 knockdown. EC-induced cells exhibit Notch activation and express HSC-specific targets of Notch signaling RUNX1 and GATA2. EC-induced PSC-MPP engraft at a higher level in NSG mice compared to cytokine-induced cells (10% >5 months), and selection increased engraftment (30%). Long-term engraftment and the myeloid-to-lymphoid ratio achieved with vascular niche induction is similar to levels achieved for cord blood MPP and up to 20-fold higher than hPSC-MPP engraftment. Our findings identify a previously underappreciated role for endothelial Notch ligands in PSC definitive hematopoiesis and production of long-term engrafting CD34+ cells and suggest they are critical for HSC emergence. Transcriptome sequencing of Macaca nemestrina (Mn) iPSCs

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Project description:While colorectal cancer liver metastasis (CRCLM) is major cause of death of colorectal cancer, the mechanism of intrahepatic dissemination (trans-lymphatic metastasis) is not fully elucidated. Lymphangiogenesis can be the mechanism of the dissemination, but there are few evidences to prove it. In this study, we attempted to clarify the mechanism using syngeneic murine CRCLM model, especially focusing on vascular endothelial growth factor C (VEGFC), a promoter of lymphangiogenesis. We confirmed that 1) intrahepatic metastasis of CRCLM via lymphatic vessels was seen and lymphangiogenesis was upregulated in the CRCLM-bearing liver, 2) the degree of lymphangiogenesis and CRCLM was significantly correlated with the expression of VEGFC in colorectal cancer (CRC) cells and 3) macrophage inflammatory protein-1α (MIP-1α) was released from CRC cells under the stimulation of VEGFC and induced migration of immature bone marrow derived cells into the liver and differentiation into macrophage, which promoted dissemination of CRCLM. These findings suggest the possibility of therapeutic strategy targeting VEGFC / MIP-1α for diminishing CRCLM. In conclusion, VEGFC in CRC cells promoted trans-lymphatic metastasis of CRCLM by upregulation of lymphangiogenesis directly and indirectly via induction of macrophages derived from bone marrow cells.

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High VEGFC expression is associated with unique gene expression profiles and predicts adverse prognosis in pediatric and adult acute myeloid leukemia.

Project description:High VEGFC mRNA expression of AML blasts is related to increased in vitro and in vivo drug resistance. The prognostic significance of VEGFC on long-term outcome and its associated gene expression profiles remain to be defined. We studied the effect of VEGFC on treatment outcome and investigated gene expression profiles associated with VEGFC using microarray data of 525 adult and 100 pediatric AML patients. High VEGFC expression appeared strongly associated with reduced complete remission rate, reduced overall and event-free survival (OS and EFS) in adult AML. Multivariable analysis established high VEGFC as prognostic indicator independent of cytogenetic risk, FLT3-ITD, NPM1, CEBPA, age and WBC. Also in pediatric AML high VEGFC was related to reduced OS. A unique series of differentially expressed genes was identified that distinguished AML with high VEGFC from AML with low VEGFC, i.e., 331 upregulated genes (representative of proliferation, VEGF-receptor activity, signal transduction) and 44 downregulated genes (e.g. related to apoptosis) consistent with a role in enhanced chemoresistance. In conclusion, high VEGFC predicts adverse long-term prognosis and provides prognostic information in addition to well-known prognostic factors. 98 bone marrow and peripheral blood samples were collected at diagnosis and frozen. They were later thawed and hybridized to Affymetrix U133 Plus 2.0 arrays.

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