Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA355003 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR5057980.fastq.gz | Fastqsanger.gz | |||
| SRR5057990.fastq.gz | Fastqsanger.gz | |||
| SRR5058000.fastq.gz | Fastqsanger.gz | |||
| SRR5057981.fastq.gz | Fastqsanger.gz | |||
| SRR5057991.fastq.gz | Fastqsanger.gz |
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Project description:Expression profiles of 7-day cultured HSPCs in the presence or absence of valproic acid and/or lithium. Two small molecules, valproic acid (VPA) and lithium (Li), were tested to inhibit differentiation of hematopoietic stem/progenitor (HSPC) cells in culture. HSPCs exposed to VPA and Li during differentiation-inducing culture preserved an immature cell phenotype, provided radioprotection to lethally irradiated recipients and enhanced in vivo repopulating potential. Furthermore, VPA and Li synergistically preserved expression of stem cell-related genes and repressed genes involved in differentiation. Target genes were collectively co-regulated during normal hematopoietic differentiation. Additionally, transcription factor networks were identified as possible primary regulators. Our results demonstrate that the combination of VPA and Li potently prevents differentiation at the biological and the molecular level, and provide evidence to suggest that combinatorial screening of chemical compounds may uncover possible additive/synergistic effects to modulate stem cell fate decisions. These data consist of total mRNA obtained from hematopoietic cells cultured for 7 days in the presence or absence of valproic acid and/or lithium. All samples were analyzed in independent biological triplicates.
2011-12-15 | E-GEOD-34088 | biostudies-arrayexpress
Project description:Two small molecules, valproic acid (VPA) and lithium (Li), were tested to inhibit differentiation of hematopoietic stem/progenitor (HSPC) cells in culture. HSPCs exposed to VPA and Li during differentiation-inducing culture preserved an immature cell phenotype, provided radioprotection to lethally irradiated recipients and enhanced in vivo repopulating potential. Furthermore, VPA and Li synergistically preserved expression of stem cell-related genes and repressed genes involved in differentiation. Target genes were collectively co-regulated during normal hematopoietic differentiation. Additionally, transcription factor networks were identified as possible primary regulators. Our results demonstrate that the combination of VPA and Li potently prevents differentiation at the biological and the molecular level, and provide evidence to suggest that combinatorial screening of chemical compounds may uncover possible additive/synergistic effects to modulate stem cell fate decisions. These data consist of total mRNA obtained from hematopoietic cells cultured for 7 days in the presence or absence of valproic acid and/or lithium. All samples were analyzed in independent biological triplicates.
2012-01-24 | E-GEOD-35291 | biostudies-arrayexpress
Project description:The identification of small molecules which either increase the number and/or enhance the activity of CD34+ hematopoietic stem and progenitor cells (HSPCs) during ex-vivo expansion has remained challenging. Applying an unbiased in vivo chemical screen in a transgenic (c-myb:EGFP) zebrafish embryo model, histone deacetylase inhibitors (HDACI) (valproic acid, resminostat and entinostat) were shown to significantly amplify the number of phenotypic hematopoietic precursors. The identified HDACIs were confirmed to significantly enhance also the expansion of human HSPCs during ex vivo treatment. Long-term functionality of ex vivo expanded human HSPCs was verified in a xenotransplantation model using NSG mice. However, the HDACI induced proliferation of HSPCs was associated with short-term functional changes. One of the identified hits, valproic acid (VPA), increased the adhesion capacity of CD34+ cells on primary mesenchymal stromal cells and reduced their chemokine-mediated migration capacity in vitro. In line with the reduced migratory potential in vitro, homing as well as early engraftment of VPA treated human CD34+ cells was significantly impaired in the xenotransplantation model. Our data confirms that HDACI treatment leads to a net expansion of HSPCs cells with long-term engraftment potential across different species. However impaired homing and short-term-engraftment has to be kept in mind when designing clinical transplantation protocols. In addition, our gene expression analysis (RNA-Seq) revealed expression of several genes that were altered in CD34+ cells by VPA treatment including cell adhesion molecules and Notch and wnt genes which has been shown to be involved in preservation of stem cell properties.
2017-11-01 | GSE90552 | GEO
Project description:The combination of valproic acid and lithium delays hematopoietic stem\progenitor differentiation
2012-01-25 | GSE35292 | GEO
Project description:Bone marrow mesenchymal stromal cells (MSCs) are a major source of secreted factors that control hematopoietic stem and progenitor cell (HSPC) function. We previously reported the generation of revitalized MSCs (rMSCs), which support functional HSCs in culture more effectively than control MSCs. In a secretomic screen using rMSCs, we identified semaphorin 3A (SEM3A) as a secreted factor upregulated as part of a pro-inflammatory signature that may underly HSPC expansion by rMSCs. Similarly, SEM3A expression is upregulated by BM-MSCs in vivo in response to hematopoietic stress. Recombinant SEM3A directly promotes HSPC quiescence ex vivo. Analysis of a SEM3A loss of function mutation in vivo revealed hematopoietic progenitor expansion and accelerated recovery after myeloablation, consistent with a role for SEM3A in regulating the HSPC stress response. This work highlights proteomic screening using rMSCs as a method to identify novel secreted niche factors and uncovers a novel role for SEM3A in promoting HSPC quiescence in stress hematopoiesis.
2025-07-11 | PXD065232 | Pride
Project description:Two small molecules, valproic acid (VPA) and lithium (Li), were tested to inhibit differentiation of hematopoietic stem/progenitor (HSPC) cells in culture. HSPCs exposed to VPA and Li during differentiation-inducing culture preserved an immature cell phenotype, provided radioprotection to lethally irradiated recipients and enhanced in vivo repopulating potential. Furthermore, VPA and Li synergistically preserved expression of stem cell-related genes and repressed genes involved in differentiation. Target genes were collectively co-regulated during normal hematopoietic differentiation. Additionally, transcription factor networks were identified as possible primary regulators. Our results demonstrate that the combination of VPA and Li potently prevents differentiation at the biological and the molecular level, and provide evidence to suggest that combinatorial screening of chemical compounds may uncover possible additive/synergistic effects to modulate stem cell fate decisions.
2012-01-24 | GSE35291 | GEO
Project description:The regenerative potential of human hematopoietic stem cells (HSCs) is well established by to their ability of life-long blood cell production and cure of a wide range of hematological diseases upon transplantation. This regenerative potential depends on HSC self-renewal and the coordinated adaptation to metabolic stress conditions. This is especially critical during ex vivo culture/manipulation of HSCs that is frequently accompanied with loss of self-renewal potential resulting in stem cell exhaustion. We have previously reported that CD34+ human hematopoietic stem and progenitor cells (HSPC) can be efficiently reprogrammed and expanded to phenotypic HSCs with long-term repopulation capacity in the presence of cytokines and valproic acid (VPA). Here, we present evidence that the SIRT1-SIRT3 axis maintains the mitochondrial activity below a critical threshold by coordinating and retaining a transcriptional and metabolic landscape of human HSCs with long-term self-renewal properties during ex vivo HSC reprogramming.
2023-04-11 | GSE218359 | GEO
Project description:Expression profiles of LSK cells stimulated for 24h in the presence or in the absence of of valproic acid (VPA) The molecular process that underlies the biological effects of valproic acid (VPA), a widely used histone deacetylase inhibitor, on HSPCs was investigated by studying the early-response genes of VPA. Genome-wide gene expression studies revealed overrepresentation of genes involved in glutathione metabolism, receptor and signal transducer activity and changes in the HSPCs surface profile following short, 24h VPA treatment. Sca-1, a well-known and widely used stem cell surface marker, was identified as a prominent VPA target.VPA strongly preserved Sca-1 expression on LSK cells, but also re-activated Sca-1 on committed progenitor cells that were Sca-1 negative, thereby reverting them to the LSK phenotype. We demonstrated that re-acquired Sca-1 expression coincided with induced self-renewal capacity as measured by in vitro re-plating assays, while Sca-1 itself was not required for the biological effects of VPA as demonstrated using Sca-1 deficient progenitor cells. We show that VPA can induce several genes involved in signal transduction of which Sca-1 was shown to mark cells with increased self-renewal capacity. These data consist of total mRNA obtained from hematopoietic cells cultured for 24h in the presence or absence of valproic acid. All samples were analyzed in independent biological triplicates.
2012-09-25 | E-GEOD-41020 | biostudies-arrayexpress
Project description:Samd14 was discovered as a novel GATA-2 target gene. Samd14 increased hematopoietic progenitor levels/activity, promoted signaling by a pathway instrumental for hematopoietic stem/progenitor cell regulation (Stem Cell Factor/c-Kit), and c-Kit rescued Samd14 loss-of-function phenotypes A control shRNA or an shRNA targeting Samd14 was retrovirally introduced to fetal liver ex vivo cultures. Progenitor cells (CD71-, Ter119-) were isolated and analyzed from these cultures
2015-06-11 | E-GEOD-68602 | biostudies-arrayexpress
Project description:Functional screen for novel regulators of murine hematopoietic stem cell in vivo repopulating activity
| PRJNA269178 | ENA