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15,738 results for “Stem cells”
Hypoxia preconditioned mesenchymal stem cells prevent cardiac fibroblast activation and collagen production via leptin
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Adiponectin stimulates exosome release to enhance mesenchymal stem cell driven therapy of heart failure in mice
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Geranylgeraniol prevents zoledronic acid-mediated reduction of viable mesenchymal stem cells via induction of Rho-dependent YAP activation
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Neuronal octopamine signaling regulates mating-induced germline stem cell increase in female Drosophila melanogaster
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Dataset and link to dataset related to article "MicroRNA-127-3p controls murine hematopoietic stem cell maintenance by limiting differentiation."
<p>The balance between self-renewal and differentiation is crucial to ensure the homeostasis of the hematopoietic system, and is a hallmark of hematopoietic stem cells. However, the underlying molecular pathways, including the role of micro-RNA, are not completely understood. To assess the contribution of micro-RNA, we performed micro-RNA profiling of hematopoietic stem cells and their immediate downstream progeny multi-potent progenitors from wild-type control and Pbx1-conditional knockout mice, whose stem cells display a profound self-renewal defect. Unsupervised hierarchical cluster analysis separated stem cells from multi-potent progenitors, suggesting that micro-RNA might regulate the first transition step in the adult hematopoietic development. Notably, Pbx1-deficient and wild-type cells clustered separately, linking micro-RNAs to self-renewal impairment. Differential expression analysis of micro-RNA in the physiological stem cell-to-multi-potent progenitor transition and in Pbx1-deficient stem cells compared to control stem cells revealed miR-127-3p as the most differentially expressed. Furthermore, miR-127-3p was strongly stem cell-specific, being quickly down-regulated upon differentiation and not re-expressed further downstream in the bone marrow hematopoietic hierarchy. Inhibition of miR-127-3p function in Lineage-negative cells, achieved through a lentiviral-sponge vector, led to severe stem cell depletion, as assessed with serial transplantation assays. miR-127-3p-sponged stem cells displayed accelerated differentiation, which was uncoupled from proliferation, accounting for the observed stem cell reduction. miR-127-3p overexpression in Lineage-negative cells did not alter stem cell pool size, but gave rise to lymphopenia, likely due to lack of miR-127-3p physiological downregulation beyond the stem cell stage. Thus, tight regulation of miR-127-3p is crucial to preserve the self-renewing stem cell pool and homeostasis of the hematopoietic system.</p> <p> </p> <p>Raw data relative to Figure 1 have been deposited in NCBI's Gene Expression Omnibus and are accessible through GEO Series accession number GSE113062, <a href="https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE113062">https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE113062</a></p>
PDX1-/NKX6.1+ progenitors derived from human pluripotent stem cells as a novel source of insulin-secreting cells
<p>PDX1-/NKX6.1+ progenitors derived from hESCs were differentiated to pancreatic beta cell stage where they generated glucose-responsive, insulin-secreting cells. The transcriptome profile of hESC- derived PDX1-/NKX6.1+ progenitors were compared with hPSC-derived PDX1+/NKX6.1+ pancreatic progenitors as described in the article entitled "<strong>PDX1<sup>-</sup>/NKX6.1<sup>+</sup>progenitors derived from human pluripotent stem cells as a novel source of insulin-secreting cells</strong>" by Memon et al. 2020. Furthermore, beta cells derived from PDX1-/NKX6.1+ progenitors (3D-beta) were compared with their own endocrine progenitors at an earlier stage (stage 5, 3D-S5) to map their development. </p> <p>The file name is : Sample name_replicate_sample ID_read direction_001 where:</p> <p>-3D-beta: insulin-expressing cells derived from self-detached, 3D, PDX1-/NKX6.1+ progenitors</p> <p>-3D-S5: endocrine progenitors from stage 5, derived from self-detached, 3D, PDX1-/NKX6.1+ progenitors</p> <p>- RNA-seq data were generated from two biological replicates in most cases.</p> <p>- Read direction: R1 (Forward), R2 (Reverse).</p>
The effect of intra-articular injection of secretome of umbilical cord mesenchymal stem cells in articular cartilage repair in sheep model
<p><b>Introduction: </b>Articular cartilage is an avascular, aneural, and alymphatic tissue that has limited capacity to regenerate. Numerous techniques have been employed to repair or regenerate; however, the success rate varies. In fact, most of them result in the formation of fibrocartilage, not hyaline cartilage. The future of treating cartilage defects lies in providing biologic solutions through cartilage regeneration. Mesenchymal stem cells (MSCs) represent a promising therapy for cartilage regeneration. These cells secrete factors that enhance cartilage repair. In this study, the effects of intra-articular injection of human umbilical cord MSC (hUC-MSC) secretome on cartilage damage was studied in a sheep model.</p> <p><b>Methods: </b>Standardized rectangular (5x5 mm) full-thickness chondral defects were created in the lateral femoral condyle of 15 adult sheep and debrided down to the subchondral bone plate. Three treatment groups were tested: 4 microfracture perforations using 1.0mm diameter awls (group 1), intra-articular injection of hUC-MSC secretome (group 2), and combination of microfracture and intra-articular injection of hUC-MSC secretome (group 3). Osteochondral repair was assessed at 6 months in vivo using established macroscopic and histological analyses.</p> <p><b>Results: </b><b></b> Macroscopically, application of combined therapy shows significant improvement of cartilage repair compared to microfracture alone (p=0.004). Microscopically, the application of combined therapy shows significant improvement of cartilage repair compared to secretome injection alone (p=0.031)</p> <p><b>Conclusion:</b> Microfracture combined with injection of hUCB-MSCs secretome could be an effective alternative for repairing articular cartilage defects in vivo.</p>
Mesenchymal stem cell-derived extracellular vesicles reduce senescence and extend healthspan in mouse models of aging.
<p>Source data file</p>
Data from: Drosophila Sulf1 is required for the termination of intestinal stem cell division during regeneration
Stem cell division is activated to trigger regeneration in response to tissue damage. The molecular mechanisms by which this stem cell mitotic activity is properly repressed at the end of regeneration are poorly understood. Here, we show that a specific modification of heparan sulfate is crucial for regulating Drosophila intestinal stem cell (ISC) division during normal midgut homeostasis and regeneration. Loss of the extracellular heparan sulfate endosulfatase Sulf1 resulted in increased ISC division during normal homeostasis, which was caused by upregulation of mitogenic signaling including the JAK-STAT, EGFR and Hedgehog pathways. Using a regeneration model, we found that ISCs failed to properly halt division at the termination stage in Sulf1 mutants, showing that Sulf1 is required for terminating ISC division at the end of regeneration. We propose that post-transcriptional regulation of mitogen signaling by heparan sulfate structural modifications provides a new regulatory step for precise temporal control of stem cell activity during regeneration.
Data from: Collagen vitrigel promotes hepatocytic differentiation of induced pluripotent stem cells into functional hepatocyte-like cells
Differentiation of stem cells to hepatocytes provides an unlimited supply of human hepatocytes and therefore has been vigorously studied. However, to date, the stem cell-derived hepatocytes were suggested to be of immature features. To obtain matured hepatocytes from stem cells, we tested the effect of culturing iPS cell-derived endoderm cells on collagen vitrigel membrane and compared with our previous reported nanofiber matrix. We cultured hiPS cell-derived endoderm cells on a collagen vitrigel membrane and examined the expression profiles, and tested the activity of metabolic enzymes. Gene expression profile analysis of hepatocytic differentiation markers revealed that upon culture on collagen vitrigel membrane, immature markers of AFP decreased, with a concomitant increase in the expression of mature hepatocyte transcription factors and mature hepatocyte markers such as ALB, ASGR1. Mature markers involved in liver functions, such as transporters, cytochrome P450 enzymes, phase II metabolic enzymes were also upregulated. We observed the upregulation of the liver markers for at least 2 weeks. Gene array profiling analysis revealed that hiPS cell-derived hepatocyte-like cells (hiPS-hep) resemble that of the primary hepatocytes. Functions of the CYP enzyme activities were tested in multi-institution and all revealed high CYP1A, CYP2C19, CYP2D6, CYP3A activity, which could be maintained for at least 2 weeks in culture. Taken together, the present approach identified that collagen vitrigel membrane provides a suitable environment for the generation of hepatocytes from hiPS cells that resemble many characteristics of primary human hepatocytes.
Dataset for "Label-free enrichment of human pluripotent stem cell-derived early retinal progenitor cells for cell-based regenerative therapies"
<p>The raw dataset for "Label-free enrichment of human pluripotent stem cell-derived early retinal progenitor cells for cell-based regenerative therapies"</p> <p><span>DOI:</span><a href="https://doi.org/10.1016/j.stemcr.2023.12.001">https://doi.org/10.1016/j.stemcr.2023.12.001</a></p>
Raw data for the article: Two Sides of The Same Coin: Normal and Tumoral Stem Cells, The Relevance of In Vitro Models and Therapeutic Approaches: The Experience with Zika Virus in Nervous System Development and Glioblastoma Treatment
<p>Neural stem cells (NSCs) were described for the first time more than two decades ago for their ability to differentiate into all neural cell lineages. The isolation of NSCs from adults and embryos was carried out by various laboratories and in different species, from mice to humans. Similarly, no more than two decades ago, cancer stem cells were described. Cancer stem cells, previously identified in hematological malignancies, have now been isolated from several solid tumors (breast, brain, and gastrointestinal compartment). Though the origin of these cells is still unknown, there is a wide consensus about their role in tumor onset, propagation and, in particular, resistance to treatments. Normal and neoplastic neural stem cells share common characteristics, and can thus be considered as two sides of the same coin. This is particularly true in the case of the Zika virus (ZIKV), which has been described as an inhibitor of neural development by specifically targeting NSCs. This understanding prompted us and other groups to evaluate ZIKV action in glioblastoma stem cells (GSCs). The results indicate an oncolytic activity of this virus vs. GSCs, opening potentially new possibilities in glioblastoma treatment.</p>
raw data - circNR3C2 promote chondrogenic differentiation and cartilage repair of human adipose-derived stem cells via hsa-miR-647/SOX9 pathway
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Lipofection of non-integrative CRISPR/Cas9 ribonucleoproteins in male germline stem cells: a simple, safe and effective knockout tool for germline genome engineering
<p>individual data on flow cytometry</p>
Application of adipose-derived Mesenchymal Stem Cells in an in vivo model of peripheral nerve damage
<p>The aim of this study is to address this issue by performing a detailed analysis of the therapeutic 29 benefits of two treatment options: adipose tissue derived-mesenchymal stem cells (ASCs) and ASC-30 conditioned medium (CM).</p>
Human adipose-derived mesenchymal stem cells prevent type 1 diabetes induced by immune checkpoint blockade
<p class="MsoNormal"><span><strong>Aims/hypothesis</strong></span></p> <p class="MsoNormal"><span> Immunomodulators blocking cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and programmed cell death protein 1 (PD-1) or programmed death-ligand 1 (PD-L1) have improved the treatment of a broad spectrum of cancers. These immune checkpoint inhibitors (ICIs) reactivate the immune system against tumour cells but can also trigger autoimmune side effects, including type 1 diabetes. Mesenchymal stem cell (MSC) therapy is the most prevalent cell therapy, with tissue-regenerating, anti-fibrosis and immunomodulatory functions provided by the secretome of the cells. Here, we examined whether systemic MSC treatment could prevent the development of type 1 diabetes in a NOD mouse model.</span></p> <p class="MsoNormal"><span><strong>Methods</strong> </span></p> <p class="MsoNormal"><span>The purified PD-L1 monoclonal antibody was administered to induce diabetes in male NOD mice which normally do not develop diabetes. Human adipose-derived MSCs were administered by tail vein injections. T cells, macrophages and monocyte-derived macrophages expressing C-X-C motif chemokine ligand 9 (CXCL9) in pancreatic sections of NOD mice and a cancer patient who developed diabetes following the ICI treatments were analysed by immunofluorescence. Tissue localisation of the injected MSCs, plasma exosome levels and plasma cytokine profiles were also investigated.</span></p> <p class="MsoNormal"><span><strong>Results</strong> </span></p> <p class="MsoNormal"><span>PD-1/PD-L1 blockade induced diabetes in 16 of 25 (64%) NOD mice which received anti-PD-L1 mAb without hMSCs [MSC(−)], whereas MSC administration decreased the incidence to four of 21 (19%) NOD mice which received anti-PD-L1 mAb and hMSCs [MSC(+)]. The PD-1/PD-L1 blockade significantly increased the area of CD3-positive T cells (6.2-fold) and Macrophage-2 (Mac-2) antigen (2.5-fold)- and CXCL9 (40.3-fold)-positive macrophages in the islets. MSCs significantly reduced T cell (45%) and CXCL9-positive macrophage (67%) accumulation in the islets and the occurrence of diabetes. The insulin content (1.9-fold) and islet beta cell area (2.7-fold) were also improved by MSCs. T cells and CXCL9-positive macrophages infiltrated into the intricate gaps between the beta cells in the islets by PD-1/PD-L1 blockade. Such immune cell infiltration was largely prevented by MSCs. The most striking difference was observed in the CXCL9-positive macrophages, which normally did not reside in the beta cell region in the islets but abundantly accumulated in this area after PD-1/PD-L1 blockade and were prevented by MSCs. The CXCL9-positive macrophages were also observed in the islets of a cancer patient who developed diabetes following the administration of ICIs but little was observed in a control patient. Mechanistically, the injected MSCs accumulated in the lung but not in the pancreas and strongly increased plasma exosome levels and changed plasma cytokine profiles.</span></p> <p class="MsoNormal"><span><strong>Conclusions/interpretation</strong></span></p> <p class="MsoNormal"><span> Our results suggest that MSCs can prevent the incidence of diabetes associated with immune checkpoint cancer therapy and may be worth further consideration for new adjuvant cell therapy.</span></p> <p class="MsoNormal"><span><strong>Data availability</strong> </span></p> <p class="MsoNormal"><span>All datasets were deposited to DOI https://doi.org/10.5061/dryad.xwdbrv1fh.</span></p>
Dataset related to article "Neonicotinoid pesticides affect developing neurons in experi-mental mouse models and in human induced pluripotent stem cell (iPSC)-derived neural cultures and organoids"
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Neonicotinoid pesticides affect developing neurons in experi-mental mouse models and in human induced pluripotent stem cell (iPSC)-derived neural cultures and organoids
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Application of adipose-derived stem cells combined with platelet-rich plasma in a rat rotator cuff repair model
<p>A controlled experimental study conducted on 48 Sprague-Dawley rats. The supraspinatus tendon was sectioned and repaired and was randomly allocated to two groups: application of PRP alone or PRP and ASCs. Biomechanical and histological analysis was performed at 3 days, 1, 2 and 4 weeks. <br> Results: There were no statistically significant differences in the biomechanical study. In the PRP group, load to failure at two weeks was 3.89 N ± 0.99 and in the ASCs group was 7.87 N ± 2.18 (p=0.05). Histological examination showed an increase in the presence of vessels at one and four weeks in the ASCs group (p=0.047). Collagen fibers were present in 25% of the repaired tissue in the ASCs group at one week and absent in the PRP group (p=0.047). Maximum differences in collagen concentration occurred at two weeks in favor of the ASCs group (p=0.059).<br> Conclusion: The use of ASCs does not improve the biomechanical properties of the repair. However, increased vascularity and collagen fibers type I were promising findings in the group treated with ASC.</p>
Role of Hypoxic Secretome from Mesenchymal Stem Cells in Enhancing Tissue Repair: Regulatory Effects on HIF-1α, VEGF, and Fibroblast in a Sphincterotomy Rat Model
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.