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Stromal inflammation is a targetable driver of hematopoietic aging [Microarray analysis]

ABSTRACT: We performed integrated analyses of hematopoietic stem and progenitor cells as well as bone marrow stromal cells to better understand the underlying mechanisms of blood aging. To determine how the molecular state of multipotent progenitor (MPP) cells change with age we performed transcriptomic analyses of myeloid-biased MPP3 and lymphoid-biased MPP4 populations from young and old mice.

ORGANISM(S): Mus musculus

PROVIDER: GSE168661 | GEO | 2022/11/02

REPOSITORIES: GEO

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EBF1 contributes to the balance of lympho-myeloid fate in haematopoietic progenitors via B-lymphoid priming and Cebpa antagonism [10x]

Project description:Haematopoietic stem cells (HSC) and multipotent progenitor cells (MPP) generate all cells of the blood system, although cellular heterogeneity and bias in lineage potential have been observed. Here, we examined whether lineage-specific transcription factors, such as the B-lineage determinant EBF1, establish lineage bias in early progenitors. We detect low level EBF1 expression in myeloid-biased MPP3 and lymphoid-biased MPP4 cells, and show that Ebf1-deficient animals display reduced HSC quiescence and repopulation capacity, enhanced myelopoiesis and enhanced myeloid differentiation potential of MPP3 and MPP4 cells. Bulk and single-cell RNA-seq analysis revealed a CEBPa-driven myeloid transcriptome in Ebf1-deficient progenitors, and we find that EBF1 binds and potentially antagonizes the haematopoietic Cebpa enhancer. In MPP3 cells, EBF1 additionally primes enhancers associated with B-lymphoid genes that gain expression in common lymphoid progenitors. Thus, our study identifies EBF1 as an important determinant in regulating the balance of myeloid versus lymphoid potential in the earliest hematopoietic progenitors.

2022-06-30 | GSE189051 | GEO

EBF1 contributes to the balance of lympho-myeloid fate in haematopoietic progenitors via B-lymphoid priming and Cebpa antagonism [Bulk RNA-seq]

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Slow Cycling and Durable Flt3+ Progenitors Contribute to Blood Production under Native Conditions

Project description:The dynamics of the hematopoietic flux responsible for blood cell production in native conditions remains a matter of debate. Using CITE-seq analyses, we uncovered a distinct progenitor population that displays a cell cycle gene signature similar to the one found in quiescent hematopoietic stem cells. We further determined that the CD62L marker can be used to phenotypically enrich this population in the Flt3+ multipotent progenitor (MPP4) compartment. Functional in vitro and in vivo analyses validated the heterogeneity of the MPP4 compartment and established the quiescent/slow-cycling properties of the CD62L– MPP4 cells. Furthermore, studies under native conditions revealed a novel hierarchical organization of the MPP compartments in which quiescent/slow-cycling MPP4 cells sustain a prolonged hematopoietic activity at steady state while giving rise to other lineage-biased MPP populations. Altogether, our data characterize a durable and productive quiescent/slow-cycling hematopoietic intermediary within the MPP4 compartment and highlight early paths of progenitor differentiation during unperturbed hematopoiesis.

2023-10-23 | GSE243197 | GEO

Functionally distinct subsets of lineage-biased multipotent progenitors control blood production in normal and regenerative conditions

Project description:To identify the molecular characterisitics of parallel lineage-biased MPP populations arising from hematopoietic stem cells (HSC) we conducted genome-wide analyses of hematopoietic stem, progenitor and mature myeloid cell populations using Affymetrix Gene ST1.0 arrays. Microarray analysis of 3-5 biological replicates of the indicated hematopoietic populations, isolated by FACS sorting from C57BL/6 mouse BM. Immunophenotypic definitions: Long-term HSC (HSCLT) (Lin-/cKit+/Sca1+/Flk2-/CD48-/CD150+); Short-term HSC (HSCST) (Lin-/cKit+/Sca1+/Flk2-/CD48-/CD150-); MPP2 (Lin-/cKit+/Sca1+/Flk2-/CD48+/CD150+); MPP3 (Lin-/cKit+/Sca1+/Flk2-/CD48+/CD150-); MPP4 (Lin-/cKit+/Sca1+/Flk2+); CMP (Lin-/cKit+/Fc?R-/CD34+); GMP (Lin-/cKit+/Fc?R+/CD34+); Pre-granulocyte (PreGr) (Mac1+/Gr1int); Granulocyte (Gr) (Mac1+/Gr1hi). HSC and GMP samples listed here were also used as controls for our related microarray study GSE48893.

2015-05-05 | E-GEOD-68529 | biostudies-arrayexpress

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Project description:Hematopoietic stem cells (HSC) and downstream lineage-biased multipotent progenitors (MPP) tailor blood production and control myelopoiesis on demand. However, a precise resolution of myeloid differentiation trajectories and cellular heterogeneity in various MPP populations and understanding of their role in controlling myeloid cell production remains largely lacking. Here, we analyze that myeloid-biased MPP3 are functionally and molecularly heterogenous, with a distinct subset of myeloid-primed secretory cells with high endoplasmic reticulum (ER) volume.

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Single Novel single cell assay reveals progressive lymphoid defect in aging multipotent hematopoietic progenitors cell RNA-seq reveals LMPP clonal dynamics in aging.

Project description:Declining immune function with age is associated with reduced lymphoid output of hematopoietic stem cells (HSCs). Currently, there is poor understanding of the dynamic changes with age in the heterogeneous multipotent hematopoietic progenitor cell compartment, which regulates output of differentiated lymphoid cells. In this study, we observed progressive and specific loss of lymphoid-primed multipotent progenitor cells (LMPP/MPP4) as young animals began to age. Single cell RNA-seq revealed a concomitant increase in cycling of these progenitors with loss of a lymphoid priming signature. To interrogate functional multipotency of single cells, we developed a novel, feeder-free in vitro assay to concurrently assess lymphoid and myeloid potential. This assay revealed altered clonal composition of the LMPP/MPP4 compartment with aging, where progenitors with B cell and macrophage-restricted potential are lost while functionally multipotent progenitors are preserved. These results pinpoint an age and cellular compartment to focus further interrogation of the drivers of lymphoid cell loss with aging.

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Single Novel single cell assay reveals progressive lymphoid defect in aging multipotent hematopoietic progenitors Cell RNA-seq reveals LMPP clonal dynamics in aging.

2016-09-27 | GSE77736 | GEO

Functionally distinct subsets of lineage-biased multipotent progenitors control blood production in normal and regenerative conditions

2015-05-05 | GSE68529 | GEO

Dynamic Gene Expression Response to TGF-b Stimulation in Multipotent Progenitors and Common Dendritic Cell Progenitors

Project description:Multipotent progenitors (MPP) and common dendritic cell progenitors (CDP) were obtained from mouse bone marrow, followed by in vitro culture with a specific cytokine cocktail and FACS sorting (Felker et al., 2010; Sere et al., 2012). Cells were treated with 10 ng/ml recombinant human TGF-b1 (R&D Systems, Minneapolis, USA) for 2, 4, 8, 12 and 24 h as described (Felker et al., 2010) or left untreated. Untreated multipotent progenitor (MPP) - MPP_0h_1 - MPP_0h_2 - MPP_0h_3 TGF-beta1 treated (2 hours) MPP - MPP_2h_1 - MPP_2h_2 - MPP_2h_3 TGF-beta1 treated (4 hours) MPP - MPP_4h_1 - MPP_4h_2 - MPP_4h_3 TGF-beta1 treated (8 hours) MPP - MPP_8h_1 - MPP_8h_2 - MPP_8h_3 TGF-beta1 treated (12 hours) MPP - MPP_12h_1 - MPP_12h_2 - MPP_12h_3 TGF-beta1 treated (24 hours) MPP - MPP_24h_1 - MPP_24h_2 - MPP_24h_3 Untreated common dendritic cell progenitor (CDP) - CDP_0h_1 - CDP_0h_2 - CDP_0h_3 TGF-beta1 treated (2 hours) CDP - CDP_2h_1 - CDP_2h_2 - CDP_2h_3 TGF-beta1 treated (4 hours) CDP - CDP_4h_1 - CDP_4h_2 - CDP_4h_3 TGF-beta1 treated (8 hours) CDP - CDP_8h_1 - CDP_8h_2 - CDP_8h_3 TGF-beta1 treated (12 hours) CDP - CDP_12h_1 - CDP_12h_2 - CDP_12h_3 TGF-beta1 treated (24 hours) CDP - CDP_24h_1 - CDP_24h_2 - CDP_24h_3

2014-04-15 | E-GEOD-46109 | biostudies-arrayexpress

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