scholarly journals Nucleosides rescue replication-mediated genome instability of human pluripotent stem cells

2019 ◽  
Author(s):  
Jason A. Halliwell ◽  
Thomas J. R. Frith ◽  
Owen Laing ◽  
Christopher J Price ◽  
Oliver J. Bower ◽  
...  
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Genome Instability ◽  
Culture Media ◽  
Replication Stress ◽  
Human Pluripotent Stem Cells ◽  
Genetic Changes ◽  
Genomic Damage ◽  
Selection Of

Human pluripotent stem cells (PSC) often acquire genetic changes on prolonged culture, which pose concerns for their use in research and regenerative medicine (Amps et al., 2011, Seth et al., 2011). The acquisition of these changes during culture necessarily first requires mutation and then selection of those mutations that provide a growth advantage. Whilst selection accounts for the recurrent nature of the variants commonly reported (Draper et al., 2004, Olariu et al., 2010), the mechanisms of mutation in PSC remain largely elusive. Here we show that, in contrast to somatic cells, human PSC have an increased susceptibility to DNA damage and mitotic errors, both of which are caused by heightened replication stress in PSC and this can be alleviated by culture with exogenous nucleosides. These results reflect the requirement for rapid replication of human PSC enabled by a truncated G1 (Becker et al., 2006, Becker et al., 2010) that impairs the preparation of these cells for the ensuing DNA replication. A similar relationship has been shown in relation to chromosomal instability in cancer cells (Burrell et al., 2013, Wilhelm et al., 2019) but PSC differ by replication stress triggering apoptosis (Desmarais et al., 2012, Desmarais et al., 2016). Nevertheless, evasion of this response still leads to the appearance of genetic variants that are of concern for regenerative medicine. The inclusion of nucleosides into culture media greatly improves the efficiency of human PSC culture and minimises the acquisition of genomic damage.

scholarly journals Human pluripotent stem cells in regenerative medicine: where do we stand?

Reproduction ◽  
2018 ◽  
Author(s):  
Ha Thi Nguyen ◽  
Kurt Jacobs ◽  
Claudia Spits
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Genome Instability ◽  
Cell Types ◽  
Clinical Applications ◽  
Human Pluripotent Stem Cells ◽  
Cell Tissue ◽  
Tumour Formation ◽  
Different Types

Human pluripotent stem cells have the capacity to self-renew indefinitely and the ability to differentiate into all cell types of a human body. These characteristics instill them with an enormous promise in regenerative medicine, where they could be used in cell, tissue and even organ-based replacement therapy. In this review, we discuss their potential clinical applications and the advantages and pitfalls for the different types of human pluripotent stem cells to transition from the bench to the bedside. We provide an overview of the current clinical trials, and the specific challenges we are still facing, including immune compatibility, suboptimal differentiation, risk of tumour formation and genome instability.

scholarly journals Development of a modular automated system for maintenance and differentiation of adherent human pluripotent stem cells

2016 ◽  
Author(s):  
Duncan E. Crombie ◽  
Maciej Daniszewski ◽  
Helena H. Liang ◽  
Tejal Kulkarni ◽  
Fan Li ◽  
...  
Keyword(s):  
Stem Cells ◽  
Pluripotent Stem Cells ◽  
Large Scale ◽  
Human Pluripotent Stem Cells ◽  
Automated System ◽  
Patient Specific ◽  
High Throughput Analysis ◽  
Large Scale Culture ◽  
Induced Pluripotent ◽  
Selection Of

AbstractPatient-specific induced pluripotent stem cells (iPSCs) have tremendous potential for development of regenerative medicine, disease modelling and drug discovery. However, the processes of reprogramming, maintenance and differentiation are labour intensive and subject to inter-technician variability. To address these issues, we established and optimised protocols to allow for the automated maintenance of reprogrammed somatic cells into iPSCs to enable the large-scale culture and passaging of human pluripotent stem cells (PSCs) using a customized TECAN Freedom EVO. Generation of iPSCs was performed offline by nucleofection followed by selection of TRA-1-60 positive cells using a Miltenyi MultiMACS24 Separator. Pluripotency markers were assessed to confirm pluripotency of the generated iPSCs. Passaging was performed using an enzyme-free dissociation method. Proof of concept of differentiation was obtained by differentiating human PSCs into cells of the retinal lineage. Key advantages of this automated approach are the ability to increase sample size, reduce variability during reprogramming or differentiation, and enable medium to high-throughput analysis of human PSCs and derivatives. These techniques will become increasingly important with the emergence of clinical trials using stem cells.

scholarly journals A Novel Vitronectin Peptide Facilitates Differentiation of Oligodendrocytes from Human Pluripotent Stem Cells (Synthetic ECM for Oligodendrocyte Differentiation)

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1254
Author(s):  
Won Ung Park ◽  
Gyu-Bum Yeon ◽  
Myeong-Sang Yu ◽  
Hui-Gwan Goo ◽  
Su-Hee Hwang ◽  
...  
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Neurological Diseases ◽  
Docking Simulation ◽  
Human Pluripotent Stem Cells ◽  
Oligodendrocyte Differentiation ◽  
In Silico Docking ◽  
Cytoskeleton Remodeling ◽  
Culture Environment

Differentiation of oligodendrocytes (ODs) presents a challenge in regenerative medicine due to their role in various neurological diseases associated with dysmyelination and demyelination. Here, we designed a peptide derived from vitronectin (VN) using in silico docking simulation and examined its use as a synthetic substrate to support the differentiation of ODs derived from human pluripotent stem cells. The designed peptide, named VNP2, promoted OD differentiation induced by the overexpression of SOX10 in OD precursor cells compared with Matrigel and full-length VN. ODs differentiated on VNP2 exhibited greater contact with axon-mimicking nanofibers than those differentiated on Matrigel. Transcriptomic analysis revealed that the genes associated with morphogenesis, cytoskeleton remodeling, and OD differentiation were upregulated in cells grown on VNP2 compared with cells grown on Matrigel. This new synthetic VN-derived peptide can be used to develop a culture environment for efficient OD differentiation.

Evidence That Human Very Small Embryonic-Like Stem Cells (VSELs) Are Mobilized by G-CSF Into Peripheral Blood: A Novel Strategy to Obtain Human Pluripotent Stem Cells for Regenerative Medicine.

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 1474-1474
Author(s):  
Satish Medicetty ◽  
Mariusz Z Ratajczak ◽  
Magdalena J Kucia ◽  
Ewa K. Zuba-Surma ◽  
Izabela Klich ◽  
...  
Keyword(s):  
Stem Cells ◽  
Regenerative Medicine ◽  
Pluripotent Stem Cells ◽  
Peripheral Blood ◽  
Embryonic Stem ◽  
Human Pluripotent Stem Cells ◽  
Employment Equity ◽  
Hematopoietic Stem ◽  
Equity Ownership ◽  
Novel Strategy

Abstract Abstract 1474 Poster Board I-497 We previously demonstrated that human cord blood contains a population of small (smaller in size than erythrocytes) CXCR4+CD133+CD34+SSEA-4+Oct-4+lin−CD45− cells (Leukemia 2007:21;297-303) and that these cells are mobilized into peripheral blood during tissue organ damage as seen for example in heart infarct (J. Am. Coll. Cardiol., 2009:53;1-9.) or stroke (Stroke. 2009:40;1237.). Similar cells were also reported in murine organs, and more importantly we described that these cells may differentiate in vitro into cells from all three germ layers (Leukemia 2006:20;857–869). To explore the possibility that human VSELs could become a source of pluripotent stem cells in regenerative medicine, our goal was to develop an efficient strategy to isolate these cells from adult patients. To test if VSELs similarly to their murine counterparts could be mobilized into peripheral blood after granulocyte colony stimulating factor (G-CSF) injection (Stem Cells 2008:26;2083-2092), we enrolled a group of young healthy donors who were mobilized for two consecutive days using G-CSF (480 μg/day subcutaneously). On the third day nucleated cells (TNC) were collected by apheresis. We evaluated number of VSELs in peripheral blood (PB) samples before and after G-CSF mobilization as well as the final number in the apheresis product. At least 1 million of TNC were acquired and analyzed by FACS Diva software. Three different fractions of non-hematopoietic stem cells enriched for VSELs (Lin−/CD45−/CD133+, Lin−/CD45−/CD34+, Lin−/CD45−/CXCR4+) as well as their CD45 positive hematopoietic counterparts were analyzed. The absolute numbers of cells from each population, contained in 1 μL of sample, were computed based on percent content of each population and TNC count for each individual sample. Results show that after G-CSF mobilization, human peripheral blood contains a population of lin− CD45− mononuclear cells that express CXCR4, CD34 and CD133 antigens. These lin− CD45− CXCR4+ CD133+ CD34+ cells are highly enriched for mRNA for intra-nuclear pluripotent embryonic transcription factors such as Oct-4, Sox2 and Nanog. More importantly we found that Oct-4 was expressed in nuclei of mobilized VSELs and that these cells also express the cell surface marker SSEA-4, the early embryonic glycolipid antigen commonly used as a marker for undifferentiated pluripotent human embryonic stem cells. We observed that these adult peripheral blood-derived VSELs are slightly larger than their counterparts identified in adult murine bone marrow, but are still very small. In addition, they also possess large nuclei containing embryonic-type unorganized euchromatin. Before G-CSF mobilization only very few VSELs were detectable in peripheral blood, whereas following G-CSF induced mobilization there was a very significant increase with in excess of 106 VSELs present in the apheresis product representing less than 0.01% of TNC. We postulate that while VSELs are relatively rare cells, they are mobilized into peripheral blood and that G-CSF induced mobilization could become a novel strategy to obtain human pluripotent stem cells for regenerative medicine. Disclosures: Medicetty: NeoStem Inc: Employment, Equity Ownership. Marasco: NeoStem Inc: Consultancy, Equity Ownership, Membership on an entity's Board of Directors or advisory committees. Rodgerson: NeoStem Inc: Employment, Equity Ownership.

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