Articles de revues : « Neural stem cells, Oligodendrocyte differentiation »

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Li, Yutong, Nicole Leanne Dittmann, Adrianne Eve Scovil Watson, Monique Marylin Alves de Almeida, Tim Footz et Anastassia Voronova. « Hepatoma Derived Growth Factor Enhances Oligodendrocyte Genesis from Subventricular Zone Precursor Cells ». ASN Neuro 14 (janvier 2022) : 175909142210863. http://dx.doi.org/10.1177/17590914221086340.

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Oligodendrocytes, the myelinating cells of the central nervous system (CNS), perform vital functions in neural protection and communication, as well as cognition. Enhanced production of oligodendrocytes has been identified as a therapeutic approach for neurodegenerative and neurodevelopmental disorders. In the postnatal brain, oligodendrocytes are generated from the neural stem and precursor cells (NPCs) in the subventricular zone (SVZ) and parenchymal oligodendrocyte precursor cells (OPCs). Here, we demonstrate exogenous Hepatoma Derived Growth Factor (HDGF) enhances oligodendrocyte genesis from murine postnatal SVZ NPCs in vitro without affecting neurogenesis or astrogliogenesis. We further show that this is achieved by increasing proliferation of both NPCs and OPCs, as well as OPC differentiation into oligodendrocytes. In vivo results demonstrate that intracerebroventricular infusion of HDGF leads to increased oligodendrocyte genesis from SVZ NPCs, as well as OPC proliferation. Our results demonstrate a novel role for HDGF in regulating SVZ precursor cell proliferation and oligodendrocyte differentiation. Summary Statement Hepatoma derived growth factor (HDGF) is produced by neurons. However, its role in the central nervous system is largely unknown. We demonstrate HDGF enhances i) oligodendrocyte formation from subventricular zone neural stem cells, and ii) oligodendrocyte precursor proliferation in vitro and in vivo.

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Herszfeld, Daniella, Natalie L. Payne, Aude Sylvain, Guizhi Sun, Claude C. Bernard, Joan Clark et Henry Sathananthan. « Fine Structure of Neurally Differentiated iPS Cells Generated from a Multiple Sclerosis (MS) Patient : A Case Study ». Microscopy and Microanalysis 20, n^o 6 (22 octobre 2014) : 1869–75. http://dx.doi.org/10.1017/s1431927614013312.

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AbstractWe compared the characteristics of neural cells derived from induced pluripotent stem (iPS) cells from a patient with multiple sclerosis versus neurally differentiated control iPS cells of a healthy individual. The iPS cells were differentiated toward the oligodendrocyte lineage using a four-step protocol established for the differentiation of embryonic stem cells. The resulting cell population was immunostained on day 112 of differentiation for the presence of oligodendrocytes and analyzed by transmission electron microscopy (TEM). Both patient and control samples resembled a mixed population of neural cells rather than oligodendroglia of high purity, including neural stem cell-like cells and possibly oligodendrocytes demonstrable by TEM.

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Li, T., Y. Xie et W. Ji. « 199 DIFFERENTIATION OF HIGHLY ENRICHED OLIGODENDROCYTE PRECURSORS AND MATURE OLIGODENDROCYTES FROM RHESUS MONKEY EMBRYONIC STEM CELLS ». Reproduction, Fertility and Development 18, n^o 2 (2006) : 207. http://dx.doi.org/10.1071/rdv18n2ab199.

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Generating homologous oligodendrocytes are required for studying the molecular mechanisms of oligodendrogliogenesis and for providing donor cells for transplantation therapies. Previous studies have shown that embryonic stem (ES) cells can be induced to generate neural stem cells with many kinds of culture systems; however, few or no oligodendrocytes were obtained from these culture systems. Here we present a simple method containing five steps for obtaining highly enriched oligodendrocyte precursors (75 � 6.8%) and mature oligodendrocytes (81 � 8.6%) from rhesus monkey embryonic stem (rES) cells. We expanded rES cells on a feeder layer of irradiated MESF (ear skin fibroblasts from a one-week-old rhesus monkey), formed embryoid bodies (EBs), promoted Day 9 (3 days in hanging drop and 6 days in suspension) differentiation into highly enriched (90.2 � 6.1%) neural progenitors (NPs) with hepatocyte growth factor (HGF) and G5 supplement [containing 5 ng/mL (bFGF) and 10 ng/mL epidermal growth factor (EGF)], purified NPs with 0.0625% trypsin in 0.04% EDTA (98% of cells were nestin-positive), amplified those progenitors in HGF and G5 media for two months, and then induced oligodendrocyte precursors differentiation in the absence of G5, but in the presence of 20 ng/mL HGF for 2 days. To obtain terminal oligodendrocytes, neurospheres cultured for 2 months were plated on laminin-coated plates for 3 weeks in the presence of HGF. The results showed that differentiated cells expressed myelin basic protein (MBP) and had typical mature oligodendrocyte morphology. Our studies also revealed that HGF significantly increased the NP proliferation speed (P < 0.05) by both decreasing cell apoptosis rate (P < 0.05) and shortening cell cycle time (P < 0.05) in the presence of G5. Additionally, HGF promoted oligodendrocyte maturation by increasing the length and number of branches and the expression of MBP. To test whether the original HGF had similar functions for oligodendrocyte specification, a series of experiments were evaluated by adding HGF or G5 to differentiation or expansion media at different differentiation stages. The results demonstrated that the ability of HGF responsiveness to initiate oligodendrocyte differentiation was regulated by G5 and by HGF alone without G5-induced rES cell differentiation into neurons. Further studies showed that the crucial time point of G5 action was from EBs to NPs; the early addition of HGF to EBs in the presence of G5 increased oligodendrocyte differentiation rate, but was not necessary, and the treatment during the first 2 days was enough to produce a similar effect; and HGF was required for terminal oligodendrocyte differentiation from NPs. Taken together, these results showed that HGF and G5 cooperatively promote rES cell differentiation into highly enriched oligodendrocyte precursors and mature oligodendrocytes.These observations set the method for obtaining highly enriched oligodendrocytes from ES cells in the nonhuman primate for clinical application and provide a platform to probe the molecular mechanisms that control oligodendrocyte differentiation.

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Mokrý, Jaroslav, Jana Karbanová, Dana Čížková, Jan Pazour, Stanislav Filip et Jan Österreicher. « Differentiation of Neural Stem Cells Into Cells of Oligodendroglial Lineage ». Acta Medica (Hradec Kralove, Czech Republic) 50, n^o 1 (2007) : 35–41. http://dx.doi.org/10.14712/18059694.2017.57.

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We described three different conditions that induce differentiation of dissociated neural stem cells derived from mouse embryonic CNS. In the first set of experiments, where the cell differentiation was triggered by cell adhesion, removal of growth factors and serum-supplemented medium, only sporadic neuronal and astroglial cells survived longer than two weeks and the latter formed a monolayer. When differentiation was induced in serum-free medium supplemented with retinoic acid, rapid and massive cell death occurred. A prolonged survival was observed in cultivation medium supplemented with serum and growth factors EGF plus FGF-2. One third of the cells did not express cell differentiation markers and were responsible for an increase in cell numbers. The remaining cells differentiated and formed the astrocytic monolayer on which occasional neuronal cells grew. One third of the differentiated phenotypes were represented by cells of oligodendroglial lineage. Differentiation of oligodendroglial cells occurred in a stepwise mechanism because the culture contained all successive developmental stages, including oligodendrocyte progenitors, preoligodendrocytes and immature and mature oligodendrocytes. Maturing oligodendrocytes displayed immunocytochemical and morphological features characteristic of cells that undergo physiological development. The cultivation conditions that supported growth and differentiation of neural stem cells were optimal for in vitro developmental studies and the production of oligodendroglial cells.

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Russell, Lauren N., et Kyle J. Lampe. « Engineering Biomaterials to Influence Oligodendroglial Growth, Maturation, and Myelin Production ». Cells Tissues Organs 202, n^o 1-2 (2016) : 85–101. http://dx.doi.org/10.1159/000446645.

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Millions of people suffer from damage or disease to the nervous system that results in a loss of myelin, such as through a spinal cord injury or multiple sclerosis. Diminished myelin levels lead to further cell death in which unmyelinated neurons die. In the central nervous system, a loss of myelin is especially detrimental because of its poor ability to regenerate. Cell therapies such as stem or precursor cell injection have been investigated as stem cells are able to grow and differentiate into the damaged cells; however, stem cell injection alone has been unsuccessful in many areas of neural regeneration. Therefore, researchers have begun exploring combined therapies with biomaterials that promote cell growth and differentiation while localizing cells in the injured area. The regrowth of myelinating oligodendrocytes from neural stem cells through a biomaterials approach may prove to be a beneficial strategy following the onset of demyelination. This article reviews recent advancements in biomaterial strategies for the differentiation of neural stem cells into oligodendrocytes, and presents new data indicating appropriate properties for oligodendrocyte precursor cell growth. In some cases, an increase in oligodendrocyte differentiation alongside neurons is further highlighted for functional improvements where the biomaterial was then tested for increased myelination both in vitro and in vivo.

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Guo, Shu-Lin, Chih-Hui Chin, Chi-Jung Huang, Chih-Cheng Chien et Yih-Jing Lee. « Promotion of the Differentiation of Dental Pulp Stem Cells into Oligodendrocytes by Knockdown of Heat Shock Protein 27 ». Developmental Neuroscience 44, n^o 2 (2022) : 91–101. http://dx.doi.org/10.1159/000521744.

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Stem cell-based therapy has been evaluated in many different clinical trials for various diseases. This capability was applied in various neurodegenerative diseases, such as multiple sclerosis, which is characterized by demyelination, axonal injury, and neuronal loss. Dental pulp stem cells (DPSCs) are mesenchymal stem cells from the oral cavity that have been studied with potential application for the regeneration of different tissues. Heat shock protein 27 (HSP27) regulates neurogenesis in the process of neural differentiation of placenta multipotent stem cells. Here, we hypothesize that HSP27 expression is also critical for the neural differentiation of DPSCs. An evaluation of the possible role of HSP27 in the differentiation of DPSCs was performed using gene knockdown and neural immunofluorescent staining. We found that HSP27 played a role in the differentiation of DPSCs and that knockdown of HSP27 in DPSCs rendered cells to oligodendrocyte progenitors; i.e., small hairpin specific for HSP27 DPSCs exhibited NG2-positive immunoreactivity and gave rise to oligodendrocytes or type-2 astrocytes. This neural differentiation of DPSCs may have clinical significance in the treatment of patients with neurodegenerative diseases. In conclusion, our data provide an example of the oligodendrocyte differentiation of a DPSC model, which may be applied in human regenerative medicine.

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Li, Shen, Jiao Zheng, Linlin Chai, Mengsi Lin, Ruocheng Zeng, Jianhong Lu et Jing Bian. « Rapid and Efficient Differentiation of Rodent Neural Stem Cells into Oligodendrocyte Progenitor Cells ». Developmental Neuroscience 41, n^o 1-2 (2019) : 79–93. http://dx.doi.org/10.1159/000499364.

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Oligodendrocyte progenitor cells (OPCs) may have beneficial effects in cell replacement therapy of neurodegenerative disease owing to their unique capability to differentiate into myelinogenic oligodendrocytes (OLs) in response to extrinsic signals. Therefore, it is of significance to establish an effective differentiation methodology to generate highly pure OPCs and OLs from some easily accessible stem cell sources. To achieve this goal, in this study, we present a rapid and efficient protocol for oligodendroglial lineage differentiation from mouse neural stem cells (NSCs), rat NSCs, or mouse embryonic stem cell-derived neuroepithelial stem cells. In a defined culture medium containing Smoothened Agonist, basic fibroblast growth factor, and platelet-derived growth factor-AA, OPCs could be generated from the above stem cells over a time course of 4–6 days, achieving a cell purity as high as ∼90%. In particular, these derived OPCs showed high expandability and could further differentiate into myelin basic protein-positive OLs within 3 days or alternatively into glial fibrillary acidic protein-positive astrocytes within 7 days. Furthermore, transplantation of rodent NSC-derived OPCs into injured spinal cord indicated that it is a feasible strategy to treat spinal cord injury. Our results suggest a differentiation strategy for robust production of OPCs and OLs from rodent stem cells, which could provide an abundant OPC source for spinal cord injury.

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Llorens-Bobadilla, Enric, James M. Chell, Pierre Le Merre, Yicheng Wu, Margherita Zamboni, Joseph Bergenstråhle, Moa Stenudd et al. « A latent lineage potential in resident neural stem cells enables spinal cord repair ». Science 370, n^o 6512 (1 octobre 2020) : eabb8795. http://dx.doi.org/10.1126/science.abb8795.

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Injuries to the central nervous system (CNS) are inefficiently repaired. Resident neural stem cells manifest a limited contribution to cell replacement. We have uncovered a latent potential in neural stem cells to replace large numbers of lost oligodendrocytes in the injured mouse spinal cord. Integrating multimodal single-cell analysis, we found that neural stem cells are in a permissive chromatin state that enables the unfolding of a normally latent gene expression program for oligodendrogenesis after injury. Ectopic expression of the transcription factor OLIG2 unveiled abundant stem cell–derived oligodendrogenesis, which followed the natural progression of oligodendrocyte differentiation, contributed to axon remyelination, and stimulated functional recovery of axon conduction. Recruitment of resident stem cells may thus serve as an alternative to cell transplantation after CNS injury.

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Ghareghani, Majid, Heibatollah Sadeghi, Kazem Zibara, Nazanin Danaei, Hassan Azari et Amir Ghanbari. « Melatonin Increases Oligodendrocyte Differentiation in Cultured Neural Stem Cells ». Cellular and Molecular Neurobiology 37, n^o 7 (16 décembre 2016) : 1319–24. http://dx.doi.org/10.1007/s10571-016-0450-4.

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Zhao, Xianghui, Jiang Wu, Minhua Zheng, Fang Gao et Gong Ju. « Specification and maintenance of oligodendrocyte precursor cells from neural progenitor cells : involvement of microRNA-7a ». Molecular Biology of the Cell 23, n^o 15 (août 2012) : 2867–77. http://dx.doi.org/10.1091/mbc.e12-04-0270.

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The generation of myelinating cells from multipotential neural stem cells in the CNS requires the initiation of specific gene expression programs in oligodendrocytes (OLs). We reasoned that microRNAs (miRNAs) could play an important role in this process by regulating genes crucial for OL development. Here we identified miR-7a as one of the highly enriched miRNAs in oligodendrocyte precursor cells (OPCs), overexpression of which in either neural progenitor cells (NPCs) or embryonic mouse cortex promoted the generation of OL lineage cells. Blocking the function of miR-7a in differentiating NPCs led to a reduction in OL number and an expansion of neuronal populations simultaneously. We also found that overexpression of this miRNA in purified OPC cultures promoted cell proliferation and inhibited further maturation. In addition, miR-7a might exert the effects just mentioned partially by directly repressing proneuronal differentiation factors including Pax6 and NeuroD4, or proOL genes involved in oligodendrocyte maturation. These results suggest that miRNA pathway is essential in determining cell fate commitment for OLs and thus providing a new strategy for modulating this process in OL loss diseases.

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Semi, Katsunori, Tsukasa Sanosaka, Masakazu Namihira et Kinichi Nakashima. « Nuclear factor I/A coordinates the timing of oligodendrocyte differentiation/maturation via Olig1 promoter methylation ». HAYATI Journal of Biosciences 25, n^o 2 (9 octobre 2018) : 70. http://dx.doi.org/10.4308/hjb.25.2.70.

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Transcription factors (TFs) and epigenetic modifications function cooperatively to regulate various biological processes such as cell proliferation, differentiation, maturation, and metabolism. TF binding to regulatory regions of target genes controls their transcriptional activity through alteration of the epigenetic status around the binding regions, leading to transcription network formation regulating cell fates. Although nuclear factor I/A (Nfia) is a well-known TF that induces demethylation of astrocytic genes to confer astrocytic differentiation potential on neural stem/precursor cells (NS/PCs), the epigenetic role of NFIA in oligodendrocytic lineage progression remains unclear. Here, we show that oligodendrocyte differentiation/maturation is delayed in the brains of Nfia-knockout (KO) mice, and that NFIA-regulated DNA demethylation in NS/PCs plays an important role in determining the timing of their differentiation. We further demonstrate that the promoter activity of the oligodendrocyte transcription factor 1 (Olig1) gene, involved in oligodendrocyte differentiation/maturation, is suppressed by DNA methylation, which is in turn regulated by Nfia expression. Our results suggest that NFIA controls the timing of oligodendrocytic differentiation/maturation via demethylation of cell-type-specific gene promoters.

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Sun, Michael, Rui Yang, Heng Liu, Wenzhe Wang, Xiao Song, Bo Hu, Nathan Reynolds et al. « STEM-21. REPURPOSING CLEMASTINE TO SUPPRESS GLIOBLASTOMA STEM CELLS ». Neuro-Oncology 24, Supplement_7 (1 novembre 2022) : vii35—vii36. http://dx.doi.org/10.1093/neuonc/noac209.138.

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Abstract Glioblastoma stem cells (GSCs), also known as brain tumor initiating cells (BTICs), drive tumor progression, heterogeneity, and resistance to treatments, posing formidable challenges to advancing effective treatments against glioblastoma (GBM). We postulated that inducing BTIC differentiation can serve as a solution to diminishing their stem-like features. Here, we report that clemastine, an over-the-counter oral medication for allergy relief, attenuates stemness and proliferation of BTICs. These effects of clemastine were accompanied by altered transcriptional programs suggestive of a shift from maintaining stem cell identity to differentiation, resonating with the ability of clemastine to promote oligodendrocyte precursor cell (OPC) differentiation to mature oligodendrocytes. Genetic perturbation and small-molecule inhibition of putative pharmacological targets of clemastine revealed that Emopamil-binding protein (EBP), an enzyme in the sterol biosynthesis pathway, played a pivotal role in mediating the differentiating and anti-tumor effects of clemastine. Notably, loss-of-function assays showed that EBP expression was indispensable for BTIC propagation. In contrast, overexpression of EBP stimulated BTIC proliferation, thus uncovering a previously unknown role of sterol metabolism in BTIC maintenance. Finally, we demonstrated that a mouse neural stem cell-derived glioma model was similarly susceptible to clemastine treatment. Taken together, our study identifies pathways essential for the perpetuation of stemness in GBM, and implicates a non-oncology drug with a well-established safety profile that can be repurposed to mitigate the stem-like properties of GBM.

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Park, Hyo Eun, Donghee Kim, Hyun Sook Koh, Sungbo Cho, Jung-Suk Sung et Jae Young Kim. « Real-Time Monitoring of Neural Differentiation of Human Mesenchymal Stem Cells by Electric Cell-Substrate Impedance Sensing ». Journal of Biomedicine and Biotechnology 2011 (2011) : 1–8. http://dx.doi.org/10.1155/2011/485173.

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Stem cells are useful for cell replacement therapy. Stem cell differentiation must be monitored thoroughly and precisely prior to transplantation. In this study we evaluated the usefulness of electric cell-substrate impedance sensing (ECIS) forin vitroreal-time monitoring of neural differentiation of human mesenchymal stem cells (hMSCs). We cultured hMSCs in neural differentiation media (NDM) for 6 days and examined the time-course of impedance changes with an ECIS array. We also monitored the expression of markers for neural differentiation, total cell count, and cell cycle profiles. Cellular expression of neuron and oligodendrocyte markers increased. The resistance value of cells cultured in NDM was automatically measured in real-time and found to increase much more slowly over time compared to cells cultured in non-differentiation media. The relatively slow resistance changes observed in differentiating MSCs were determined to be due to their lower growth capacity achieved by induction of cell cycle arrest in G0/G1. Overall results suggest that the relatively slow change in resistance values measured by ECIS method can be used as a parameter for slowly growing neural-differentiating cells. However, to enhance the competence of ECIS forin vitroreal-time monitoring of neural differentiation of MSCs, more elaborate studies are needed.

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Marei, Hany E., Zeinab Shouman, Asma Althani, Nahla Afifi, Abd-Elmaksoud A, Samah Lashen, Anwarul Hasan et al. « Differentiation of human olfactory bulb-derived neural stem cells toward oligodendrocyte ». Journal of Cellular Physiology 233, n^o 2 (22 juin 2017) : 1321–29. http://dx.doi.org/10.1002/jcp.26008.

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Mitra, Siddhartha S., Abdullah H. Feroze, Sharareh Gholamin, Chase Richard, Rogelio Esparza, Michael Zhang, Tej D. Azad et al. « Neural Placode Tissue Derived From Myelomeningocele Repair Serves as a Viable Source of Oligodendrocyte Progenitor Cells ». Neurosurgery 77, n^o 5 (29 juillet 2015) : 794–802. http://dx.doi.org/10.1227/neu.0000000000000918.

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Abstract BACKGROUND: The presence, characteristics, and potential clinical relevance of neural progenitor populations within the neural placodes of myelomeningocele patients remain to be studied. Neural stem cells are known to reside adjacent to ependyma-lined surfaces along the central nervous system axis. OBJECTIVE: Given such neuroanatomic correlation and regenerative capacity in fetal development, we assessed myelomeningocele-derived neural placode tissue as a potentially novel source of neural stem and progenitor cells. METHODS: Nonfunctional neural placode tissue was harvested from infants during the surgical repair of myelomeningocele and subsequently further analyzed by in vitro studies, flow cytometry, and immunofluorescence. To assess lineage potential, neural placode-derived neurospheres were subjected to differential media conditions. Through assessment of platelet-derived growth factor receptor α (PDGFRα) and CD15 cell marker expression, Sox2+Olig2+ putative oligodendrocyte progenitor cells were successfully isolated. RESULTS: PDGFRαhiCD15hi cell populations demonstrated the highest rate of self-renewal capacity and multipotency of cell progeny. Immunofluorescence of neural placode-derived neurospheres demonstrated preferential expression of the oligodendrocyte progenitor marker, CNPase, whereas differentiation to neurons and astrocytes was also noted, albeit to a limited degree. CONCLUSION: Neural placode tissue contains multipotent progenitors that are preferentially biased toward oligodendrocyte progenitor cell differentiation and presents a novel source of such cells for use in the treatment of a variety of pediatric and adult neurological disease, including spinal cord injury, multiple sclerosis, and metabolic leukoencephalopathies.

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Kang, H. S., E. M. Jung et E. B. Jeung. « 205 ASSESSMENT OF DEVELOPMENTAL NEUROTOXICITY ON NEURAL DIFFERENTIATION IN HUMAN EMBRYONIC STEM CELLS ». Reproduction, Fertility and Development 26, n^o 1 (2014) : 216. http://dx.doi.org/10.1071/rdv26n1ab205.

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Human embryonic stem cells (hESCs) have a potential for differentiation into neuronal cells. Neural differentiation of hESCs is currently used in many fields of neurological study. Therefore, evaluation of developmental neurotoxicity in hESCs is possible during the embryonic period. In the current study, we investigated the neuronal toxicity of hydroxyurea, cytosine arabinoside, and penicillin G at multiple doses (low, medium, high) for 28 days for neural differentiation. For assessment of neural toxicity, we examined the expression of marker genes that represent neural cell development. The mRNA levels of the marker genes were evaluated by real-time PCR in hESCs. Morphological changes of hESCs during neuronal differentiation were also estimated. The results for low and medium doses of hydroxylurea showed a significant increase of dopaminergic neuron marker gene (NR4A2) and GABA neuron marker gene (GAD2). However, glutamartergic neuron marker gene (SLC1A2) and oligodendrocyte marker gene (CNP) showed a significant decrease. Results for another drug, cytosine arabinoside, showed a significant decrease of glutamartergic neuron marker gene (SLC1A2) and oligodendrocyte marker gene (CNP) at a high dose. In addition, cytosine arabinoside caused a significant decrease of dopaminergic neuron marker gene (NR4A2) without significant change in GAD2. For the control, penicillin G, no significant difference in expression of neural specific-genes was observed at all tested doses. These findings suggest that neural-specific genes are perturbed by hydroxyurea and cytosine arabinoside, which may be involved in abnormal neural development during the embryonic neurogenesis period in hESCs.

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Liu, Chang, Xu Hu, Yawen Li, Wenjie Lu, Wenlin Li, Nan Cao, Saiyong Zhu, Jinke Cheng, Sheng Ding et Mingliang Zhang. « Conversion of mouse fibroblasts into oligodendrocyte progenitor-like cells through a chemical approach ». Journal of Molecular Cell Biology 11, n^o 6 (10 janvier 2019) : 489–95. http://dx.doi.org/10.1093/jmcb/mjy088.

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Abstract Transplantation of oligodendrocyte progenitor cells (OPCs) is a promising way for treating demyelinating diseases. However, generation of scalable and autologous sources of OPCs has proven difficult. We previously established a chemical condition M9 that could specifically initiate neural program in mouse embryonic fibroblasts. Here we found that M9 could induce the formation of colonies that undergo mesenchymal-to-epithelial transition at the early stage of reprogramming. These colonies may represent unstable and neural lineage-restricted intermediates that have not established a neural stem cell identity. By modulating the culture signaling recapitulating the principle of OPC development, these intermediate cells could be reprogrammed towards OPC fate. The chemical-induced OPC-like cells (ciOPLCs) resemble primary neural stem cell-derived OPCs in terms of their morphology, gene expression, and the ability of self-renewal. Upon differentiation, ciOPLCs could produce functional oligodendrocytes and myelinate the neuron axons in vitro, validating their OPC identity molecularly and functionally. Therefore, our study provides a non-integrating approach to OPC reprogramming that may ultimately provide an avenue to patient-specific cell-based or in situ regenerative therapy.

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Bian, Jing, Jiao Zheng, Shen Li, Lan Luo et Fei Ding. « Sequential Differentiation of Embryonic Stem Cells into Neural Epithelial-Like Stem Cells and Oligodendrocyte Progenitor Cells ». PLOS ONE 11, n^o 5 (18 mai 2016) : e0155227. http://dx.doi.org/10.1371/journal.pone.0155227.

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Ulc, Annika, Christine Gottschling, Ina Schäfer, David Wegrzyn, Simon van Leeuwen, Veronika Luft, Jacqueline Reinhard et Andreas Faissner. « Involvement of the guanine nucleotide exchange factor Vav3 in central nervous system development and plasticity ». Biological Chemistry 398, n^o 5-6 (1 mai 2017) : 663–75. http://dx.doi.org/10.1515/hsz-2016-0275.

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Abstract Small GTP-hydrolyzing enzymes (GTPases) of the RhoA family play manifold roles in cell biology and are regulated by upstream guanine nucleotide exchange factors (GEFs). Herein, we focus on the GEFs of the Vav subfamily. Vav1 was originally described as a proto-oncogene of the hematopoietic lineage. The GEFs Vav2 and Vav3 are more broadly expressed in various tissues. In particular, the GEF Vav3 may play important roles in the developing nervous system during the differentiation of neural stem cells into the major lineages, namely neurons, oligodendrocytes and astrocytes. We discuss its putative regulatory roles for progenitor differentiation in the developing retina, polarization of neurons and formation of synapses, migration of oligodendrocyte progenitors and establishment of myelin sheaths. We propose that Vav3 mediates the response of various neural cell types to environmental cues.

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Silva, Maria Elena, Matías Hernández-Andrade, Nerea Abasolo, Cristóbal Espinoza-Cruells, Josselyne B. Mansilla, Carolina R. Reyes, Selena Aranda et al. « DDR1 and Its Ligand, Collagen IV, Are Involved in In Vitro Oligodendrocyte Maturation ». International Journal of Molecular Sciences 24, n^o 2 (16 janvier 2023) : 1742. http://dx.doi.org/10.3390/ijms24021742.

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Discoidin domain receptor 1 (DDR1) is a tyrosine kinase receptor expressed in epithelial cells from different tissues in which collagen binding activates pleiotropic functions. In the brain, DDR1 is mainly expressed in oligodendrocytes (OLs), the function of which is unclear. Whether collagen can activate DDR1 in OLs has not been studied. Here, we assessed the expression of DDR1 during in vitro OL differentiation, including collagen IV incubation, and the capability of collagen IV to induce DDR1 phosphorylation. Experiments were performed using two in vitro models of OL differentiation: OLs derived from adult rat neural stem cells (NSCs) and the HOG16 human oligodendroglial cell line. Immunocytofluorescence, western blotting, and ELISA were performed to analyze these questions. The differentiation of OLs from NSCs was addressed using oligodendrocyte transcription factor 2 (Olig2) and myelin basic protein (MBP). In HOG16 OLs, collagen IV induced DDR1 phosphorylation through slow and sustained kinetics. In NSC-derived OLs, DDR1 was found in a high proportion of differentiating cells (MBP+/Olig2+), but its protein expression was decreased in later stages. The addition of collagen IV did not change the number of DDR1+/MBP+ cells but did accelerate OL branching. Here, we provide the first demonstration that collagen IV mediates the phosphorylation of DDR1 in HOG16 cells and that the in vitro co-expression of DDR1 and MBP is associated with accelerated branching during the differentiation of primary OLs.

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Kanakasabai, Saravanan, Ecaterina Pestereva, Wanida Chearwae, Sushil K. Gupta, Saif Ansari et John J. Bright. « PPARγ Agonists Promote Oligodendrocyte Differentiation of Neural Stem Cells by Modulating Stemness and Differentiation Genes ». PLoS ONE 7, n^o 11 (21 novembre 2012) : e50500. http://dx.doi.org/10.1371/journal.pone.0050500.

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Wang, Le, Caitlin R. Schlagal, Junling Gao, Yan Hao, Tiffany J. Dunn, Erica L. McGrath, Javier Allende Labastida et al. « Oligodendrocyte differentiation from human neural stem cells : A novel role for c-Src ». Neurochemistry International 120 (novembre 2018) : 21–32. http://dx.doi.org/10.1016/j.neuint.2018.07.006.

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Balasubramaniyan, V. « Transient Expression of Olig1 Initiates the Differentiation of Neural Stem Cells into Oligodendrocyte Progenitor Cells ». Stem Cells 22, n^o 6 (1 novembre 2004) : 878–82. http://dx.doi.org/10.1634/stemcells.22-6-878.

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Huillard, Emmanuelle, Léa Ziercher, Olivier Blond, Michael Wong, Jean-Christophe Deloulme, Serhiy Souchelnytskyi, Jacques Baudier, Claude Cochet et Thierry Buchou. « Disruption of CK2β in Embryonic Neural Stem Cells Compromises Proliferation and Oligodendrogenesis in the Mouse Telencephalon ». Molecular and Cellular Biology 30, n^o 11 (5 avril 2010) : 2737–49. http://dx.doi.org/10.1128/mcb.01566-09.

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ABSTRACT Genetic programs that govern neural stem/progenitor cell (NSC) proliferation and differentiation are dependent on extracellular cues and a network of transcription factors, which can be regulated posttranslationally by phosphorylation. However, little is known about the kinase-dependent pathways regulating NSC maintenance and oligodendrocyte development. We used a conditional knockout approach to target the murine regulatory subunit (beta) of protein kinase casein kinase 2 (CK2β) in embryonic neural progenitors. Loss of CK2β leads to defects in proliferation and differentiation of embryonic NSCs. We establish CK2β as a key positive regulator for the development of oligodendrocyte precursor cells (OPCs), both in vivo and in vitro. We show that CK2β directly interacts with the basic helix-loop-helix (bHLH) transcription factor Olig2, a critical modulator of OPC development, and activates the CK2-dependent phosphorylation of its serine-threonine-rich (STR) domain. Finally, we reveal that the CK2-targeted STR domain is required for the oligodendroglial function of Olig2. These findings suggest that CK2 may control oligodendrogenesis, in part, by regulating the activity of the lineage-specific transcription factor Olig2. Thus, CK2β appears to play an essential and uncompensated role in central nervous system development.

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Silswal, Neerupma, Joe Bean, Herschel Gupta, Fatma Talib, Suban Burale, Archita Goyal, Ahmed Shabbir, Donald Benedict DeFranco et Paula Monaghan-Nichols. « Betamethasone Induces a Unique Transcriptome in Neural Stem Cells ». Journal of the Endocrine Society 5, Supplement_1 (1 mai 2021) : A802. http://dx.doi.org/10.1210/jendso/bvab048.1631.

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Abstract Twelve percent of pregnant women receive glucocorticoids (sGCs) to reduce the risks to reduce morbidity and mortality associated with preterm birth in infants. The two most commonly administered sGC are Dexamethasone (Dex) and Betamethasone (Beta) and they serve to decrease the severity of respiratory distress, intraventricular hemorrhage and necrotizing enterocolitis. However, repeated administration of sGC has been shown to be associated with adverse neurological outcome and depends on the type of sGCs used, dose, timing of sGCs administration and sex. We have previously shown that prenatal exposure to Dex in a murine model lead to sex specific changes in the transcription response and in the biological function of neural stem cells and to long-term changes in brain architecture and behavior. Beta is the predominant sGC used prenatally in the United States, therefore these studies investigated the cellular and molecular responses to beta exposure on the neural stem cells in-vitro and anatomical organization of the brain in-vivo. Murine NSCs were isolated from the E14.5 cerebral cortex and exposed to 10-7 M Dex, 10-7 M Beta, or Vehicle for 4 or 24 hours and the immediate and long-term impact on transcription, proliferation and neuronal, glial and oligodendrocyte differentiation examined. Affymetrix genome transcriptional analyses reveal sex specific responses to Dex vs Beta in 4 hours. In females 682 genes were differentially regulated by Dex compared to 576 by Beta. In contrast, 875 were altered by Dex and 576 by Beta in males (Fold change > +/- 1.5, P< 0.05). Select target genes were independently validated by QPCR. Ingenuity Pathway Analysis was used to identify unique and overlapping pathways that were altered by Dex vs Beta. In males, Dex uniquely altered 34 pathways including, Thyroid Hormone Metabolism, ERK5 Signaling and Opioid Signaling while Bata altered 33 pathways including, Phagasome formation, IL-7 Signaling and JAK STAT signaling. In Females, Dex altered 45 pathways including Calcium Signaling, Serotonin Receptor Signaling and Xenobiotic Signaling, while Beta altered 46 pathways including, FXR/RXR Activation, Tec Kinase Signaling and D-myo-Inositol-5-Phosphate Metabolism. Another 35 pathways were altered by both Dex and Beta but they showed differences in genes activated or repressed. Dex and Beta, both significantly altered genes involved in proliferation and differentiation therefore the biological response of NSC to sGCs stimulation in vitro and the long term consequences of sGC exposure in-vivo was compared. Distinct differences in cell proliferation, glial and oligodendrocyte differentiation were observed. These results reveal gene targets, cellular pathways and processes that are differentially altered by prenatal Dex vs Beta exposure. Our finds may provide insights into the sex specific neurological outcomes observed in children exposed to sGCs in-utero.

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Yoon, Sang-Hoon, Mi-Rae Bae, Hyeonwoo La, Hyuk Song, Kwonho Hong et Jeong-Tae Do. « Efficient Generation of Neural Stem Cells from Embryonic Stem Cells Using a Three-Dimensional Differentiation System ». International Journal of Molecular Sciences 22, n^o 15 (3 août 2021) : 8322. http://dx.doi.org/10.3390/ijms22158322.

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Mouse embryonic stem cells (ESCs) are useful tools for studying early embryonic development and tissue formation in mammals. Since neural lineage differentiation is a major subject of organogenesis, the development of efficient techniques to induce neural stem cells (NSCs) from pluripotent stem cells must be preceded. However, the currently available NSC differentiation methods are complicated and time consuming. This study aimed to propose an efficient method for the derivation of NSCs from mouse ESCs; early neural lineage commitment was achieved using a three-dimensional (3D) culture system, followed by a two-dimensional (2D) NSC derivation. To select early neural lineage cell types during differentiation, Sox1-GFP transgenic ESCs were used. They were differentiated into early neural lineage, forming spherical aggregates, which were subsequently picked for the establishment of 2D NSCs. The latter showed a morphology similar to that of brain-derived NSCs and expressed NSC markers, Musashi, Nestin, N-cadherin, and Sox2. Moreover, the NSCs could differentiate into three subtypes of neural lineages, neurons, astrocytes, and oligodendrocytes. The results together suggested that ESCs could efficiently differentiate into tripotent NSCs through specification in 3D culture (for approximately 10 days) followed by 2D culture (for seven days).

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Gallegos-Cardenas, A., K. Wang, E. T. Jordan, R. West, F. D. West, J. Y. Yang et S. L. Stice. « 191 ROBUST GENERATION OF NEURAL STEM CELLS FROM PIG INDUCED PLURIPOTENT STEM CELLS FOR TRANSLATIONAL NEURAL REGENERATIVE MEDICINE ». Reproduction, Fertility and Development 26, n^o 1 (2014) : 210. http://dx.doi.org/10.1071/rdv26n1ab191.

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The generation of pig induced pluripotent stem cells (iPSC) opened the possibility to evaluate autologous neural cell therapy as a viable option for human patients. However, it is necessary to demonstrate whether pig iPSC are capable of in vitro neural differentiation similar to human iPSC in order to perform in vitro and in vivo comparative studies. Multiple laboratories have generated pig iPSC that have been characterised using pluripotent markers such as SSEA4 and POU5F1. However, correlations of pluripotent marker expression profiles among iPSC lines and their neural differentiation potential has not been fully explored. Because neural rosettes (NR) are composed of neural stem cells, our goal was to demonstrate that NR from pig iPSC can be generated, isolated, and expanded in vitro from multiple porcine iPSC lines similar to human iPSC and that the level of pluripotency in the starting porcine iPSC population (POUF51 and SSEA4 expression) could influence NRs development. Three lines of pig iPSC L1, L2, and L3 were cultured on matrigel-coated plates in mTeSR1 medium (Stemcell Technologies Inc., Vancouver, BC, Canada) and passaged every 3 to 4 days. For neural induction (NI), pig iPSC were disaggregated using dispase and plated. After 24 h, cells were maintained in N2 media [77% DMEM/F12, 10 ng mL–1 bovine fibroblast growth factor (bFGF), and 1X N2] for 15 days. To evaluate the differentiation potential to neuron and glial cells, NR were isolated, expanded in vitro and cultured for three weeks in AB2 medium (AB2, 1X ANS, and 2 mM L-Glutamine). Immunostaining assays were performed to determine pluripotent (POU5F1 and SSEA4), tight junction (ZO1), neural epithelial (Pax6 and Sox1), neuron (Tuj1), astrocyte (GFAP), and oligodendrocyte (O4) marker expression. Line L2 (POU5F1high and SSEA4low) showed a high potential to form NR (6.3.5%, P < 0.05) in comparison to the other 2 lines L1 (POU5F1low and SSEA4low) and L3 (POU5F1low and SSEA4high) upon NI. The NR immunocytochemistry results from Line L2 showed the presence of Pax6+ and Sox1– NRs cells at day 9 post-neural induction and that ZO1 started to localise at the apical border of NRs. At day 13, NRs cells were Pax6+ and Sox1+, and ZO1 was localised to the lumen of NR. After isolation and culture in vitro, NR cells expressed transcription factors PLAGL1, DACH1, and OTX2 through 2 passages, but were not detected in later passages. However, rosette cytoarchitecture was present up until passage 7 and were still Pax6+/Sox1+. NRs at passage 2 were cryopreserved and upon thaw showed normal NR morphology and were Pax6+/Sox1+. To characterise the plasticity of NRs, cells were differentiated. Tuj1 expression was predominant after differentiation indicating a bias towards a neuron phenotype. These results demonstrate that L2 pig iPSC (POUF51high and SSEA4low) have a high potential to form NR and neural differentiation parallels human iPSC neurulation events. Porcine iPSC should be considered as a large animal model for determining the safety and efficacy of human iPSC neural cell therapies.

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Mogas Barcons, Aina, Farhana Chowdhury, Divya M. Chari et Christopher Adams. « Systematic Alignment Analysis of Neural Transplant Cells in Electrospun Nanofibre Scaffolds ». Materials 16, n^o 1 (23 décembre 2022) : 124. http://dx.doi.org/10.3390/ma16010124.

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Spinal cord injury is debilitating with functional loss often permanent due to a lack of neuro-regenerative or neuro-therapeutic strategies. A promising approach to enhance biological function is through implantation of tissue engineered constructs, to offer neural cell replacement and reconstruction of the functional neuro-architecture. A key goal is to achieve spatially targeted guidance of regenerating tissue across the lesion site to achieve an aligned tissue structure lost as a consequence of injury. Electrospun nanofibres mimic the nanoscale architecture of the spinal cord, can be readily aligned, functionalised with pro-regenerative molecules and incorporated into implantable matrices to provide topographical cues. Crucially, electrospun nanofibers are routinely manufactured at a scale required for clinical use. Although promising, few studies have tested whether electrospun nanofibres can guide targeted spatial growth of clinically relevant neural stem/precursor populations. The alignment fate of daughter cells (derived from the pre-aligned parent cells) has also received limited attention. Further, a standardised quantification methodology to correlate neural cell alignment with topographical cues is not available. We have adapted an image analysis technique to quantify nanofibre-induced alignment of neural cells. Using this method, we show that two key neural stem/precursor populations of clinical relevance (namely, neural stem cells (NSCs) and oligodendrocyte precursor cells), reproducibly orientate their growth to aligned, high-density electrospun nanofiber meshes, but not randomly distributed ones. Daughter populations derived from aligned NSCs (neurons and astrocytes) maintained their alignment following differentiation, but oligodendrocytes did not. Our data show that pre-aligned transplant populations can be used to generate complex, multicellular aligned-fibre constructs for neural implantation.

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Saito, Norihiko, Sho Sato, Yu Hiramoto, Satoshi Fujita, Haruo Nakayama, Morito Hayashi, Keisuke Ito, Takatoshi Sakurai et Satoshi Iwabuchi. « CBIO-20. MOLECULAR MECHANISMS OF OLIG2 TRANSCRIPTION FACTOR IN GLIOBLASTOMA ». Neuro-Oncology 22, Supplement_2 (novembre 2020) : ii19—ii20. http://dx.doi.org/10.1093/neuonc/noaa215.080.

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Abstract Oligodendrocyte lineage transcription factor 2 (OLIG2) promotes proliferation of normal neural stem/progenitor cells and glioma cells. However, the mechanisms underlying the regulation of OLIG2 remain largely unknown. Here, we show that a comprehensive analysis of the critical gene regulatory networks involving OLIG2 in glioma initiating cell (GIC) lines. In vitro differentiation studies showed that proneural GIC lines possess the potential to differentiate into astrocytic, neuronal, and oligodendrocytic lineages, whereas mesenchymal GICs exhibited limited potential for neural lineage differentiation following retinoic acid induction. We also showed that CDK2-mediated OLIG2 phosphorylation stabilizes OLIG2 protein from proteasomal degradation. Phosphorylated OLIG2 binds to the E-Box regions of p27 promoter and represses p27 transcription, which in turn activates CDK2 in positive feedback manner. CDK2-mediated OLIG2 phosphorylation promotes cell cycle progression, cell proliferation, and tumorigenesis. OLIG2 inhibition disrupted cell cycle control mechanism by decreasing CDK2 and elevating apoptosis-related molecules. Inhibition of CDK2 activity disrupted OLIG2-CDK2 interactions and attenuated OLIG2 protein stability. In addition, OLIG2-high glioma initiating cells are highly sensitive to CDK2 inhibitor treatment, indicating that OLIG2 can be a biomarker for personalized treatment for glioblastoma patients with CDK2 inhibitors. In conclusion, we have identified OLIG2-CDK2 interactions in glioma stem cells that can be targeted by CDK2 inhibitors and this may allow the selection of patients with high likelihood of responding to this therapy.

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Wang, Pei-Shan, Jing Wang, Yi Zheng et Catherine J. Pallen. « Loss of Protein-tyrosine Phosphatase α (PTPα) Increases Proliferation and Delays Maturation of Oligodendrocyte Progenitor Cells ». Journal of Biological Chemistry 287, n^o 15 (21 février 2012) : 12529–40. http://dx.doi.org/10.1074/jbc.m111.312769.

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Tightly controlled termination of proliferation determines when oligodendrocyte progenitor cells (OPCs) can initiate differentiation and mature into myelin-forming cells. Protein-tyrosine phosphatase α (PTPα) promotes OPC differentiation, but its role in proliferation is unknown. Here we report that loss of PTPα enhanced in vitro proliferation and survival and decreased cell cycle exit and growth factor dependence of OPCs but not neural stem/progenitor cells. PTPα−/− mice have more oligodendrocyte lineage cells in embryonic forebrain and delayed OPC maturation. On the molecular level, PTPα-deficient mouse OPCs and rat CG4 cells have decreased Fyn and increased Ras, Cdc42, Rac1, and Rho activities, and reduced expression of the Cdk inhibitor p27Kip1. Moreover, Fyn was required to suppress Ras and Rho and for p27Kip1 accumulation, and Rho inhibition in PTPα-deficient cells restored expression of p27Kip1. We propose that PTPα-Fyn signaling negatively regulates OPC proliferation by down-regulating Ras and Rho, leading to p27Kip1 accumulation and cell cycle exit. Thus, PTPα acts in OPCs to limit self-renewal and facilitate differentiation.

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Gill, Nikki, Suban Burale, Neerupma Silswal, Donald Benedict DeFranco et Paula Monaghan-Nichols. « The Impact of Cannabinoid Exposure on Glucocorticoid Receptor Signaling in Neural Stem Cells ». Journal of the Endocrine Society 5, Supplement_1 (1 mai 2021) : A73. http://dx.doi.org/10.1210/jendso/bvab048.147.

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Abstract Preterm birth-birth before 37 weeks of pregnancy-can cause many short- and long-term complications in newborns, including respiratory distress syndrome (RDS). RDS results from incomplete lung development and a surfactant deficiency, and it is a major factor of pre-term mortality. Synthetic glucocorticoids (sGCs) such as Betamethasone or Dexamethasone (Beta, Dex) are administered prenatally to women at risk of pre-term birth to prevent preterm complications. While sGCs are known to improve outcome, they also cause alterations in brain development and neural stem cell biology that are associated with long-term neurological defects. One common recreational drug used during pregnancy is cannabis. Some of the active components of cannabis include cannabinoids, which interact with the endocannabinoid receptor pathway in cells. Cannabinoids have been shown to induce proliferation and differentiation of embryonic neural stem cells (NSCs). We hypothesized that maternal cannabis use activates cannabinoid signaling pathways and leads to changes in glucocorticoid signaling in the developing brain. The purpose of this study was to determine whether cannabis use leads to a better or worse neurological outcome for children born pre-term and treated with sGCs for RDS. Neural stem cell neurospheres (NSCs) were isolated from the cerebral cortex of mice and treated with Vehicle (ethanol), Dex, cannabinoid receptor agonist WIN-55,212-2 (Win), or a combination WinDex. The transcriptional profile induced by exposure to Vehicle, Dex, and WinDex RNA were analyzed using microarray analyses examining the complete expressed genome. Gene Chip profiles indicated that both glucocorticoids and cannabinoids induce distinct transcriptional responses in E14.5 NSCs. The genes involved in proliferation-including S100a11, Jun, and Bex2-were repressed by Dex whereas WinDex rescued some of these expression profiles. Some genes encoding microRNA that inhibit our top target coding genes implicated in proliferation showed a greater induction by Dex compared to WinDex. Quantitative Polymerase Chain Reaction (qPCR) was performed to validate our genes of interest, including Adm, which has been shown to induce neural stem cell proliferation and differentiation. The biological impact of Winn on Dex-induced changes in NSC function were examined by in-vitro proliferation and differentiation studies using antibodies to Tuj1 (neurons), GFAP (glia), and CNPase (immature oligodendrocytes). The experiments indicate that Dex increased neuronal and oligodendrocyte differentiation, while WinDex appeared to reverse this phenotype in neurons. These studies suggest that cannabis use during pregnancy may limit the biological impact sGCs for preterm birth and lead to distinct cellular responses.

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Varshney, Mukesh K., José Inzunza, Diana Lupu, Vaidheeswaran Ganapathy, Per Antonson, Joëlle Rüegg, Ivan Nalvarte et Jan-Åke Gustafsson. « Role of estrogen receptor beta in neural differentiation of mouse embryonic stem cells ». Proceedings of the National Academy of Sciences 114, n^o 48 (13 novembre 2017) : E10428—E10437. http://dx.doi.org/10.1073/pnas.1714094114.

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The ability to propagate mature cells and tissue from pluripotent stem cells offers enormous promise for treating many diseases, including neurodegenerative diseases. Before such cells can be used successfully in neurodegenerative diseases without causing unwanted cell growth and migration, genes regulating growth and migration of neural stem cells need to be well characterized. Estrogen receptor beta (ERβ) is essential for migration of neurons and glial cells in the developing mouse brain. To examine whether ERβ influences differentiation of mouse embryonic stem cells (mESC) into neural lineages, we compared control and ERβ knockout (BERKO) mESCs at defined stages of neural development and examined the effects of an ERβ-selective ligand (LY3201) with a combination of global and targeted gene-expression profiling and the expression of key pluripotency markers. We found that ERβ was induced in embryoid bodies (EBs) and neural precursor cells (NPCs) during development. Proliferation was higher in BERKO NPCs and was inhibited by LY3201. Neurogenesis was reduced in BERKO ES cells, and oligodendrogliogenesis was enhanced. BERKO EBs expressed higher levels of key ectodermal and neural progenitor markers and lower levels of markers for mesoderm and endoderm lineages. ERβ-regulated factors are involved in cell adhesion, axon guidance, and signaling of Notch and GABA receptor pathways, as well as factors important for the differentiation of neuronal precursors into dopaminergic neurons (Engrailed 1) and for the oligodendrocyte fate acquisition (Olig2). Our data suggest that ERβ is an important component for differentiation into midbrain neurons as well as for preventing precocious oligodendrogliogenesis.

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Imitola, Jaime, Evan Y. Snyder et Samia J. Khoury. « Genetic programs and responses of neural stem/progenitor cells during demyelination : potential insights into repair mechanisms in multiple sclerosis ». Physiological Genomics 14, n^o 3 (15 août 2003) : 171–97. http://dx.doi.org/10.1152/physiolgenomics.00021.2002.

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In recent years, it has become evident that the adult mammalian CNS contains a population of neural stem cells (NSCs) described as immature, undifferentiated, multipotent cells, that may be called upon for repair in neurodegenerative and demyelinating diseases. NSCs may give rise to oligodendrocyte progenitor cells (OPCs) and other myelinating cells. This article reviews recent progress in elucidating the genetic programs and dynamics of NSC and OPC proliferation, differentiation, and apoptosis, including the response to demyelination. Emerging knowledge of the molecules that may be involved in such responses may help in the design of future stem cell-based treatment of demyelinating diseases such as multiple sclerosis.

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Hosseini, Seyed Mojtaba, Tahere Talaei-khozani, Mahsa Sani et Bahareh Owrangi. « Differentiation of Human Breast-Milk Stem Cells to Neural Stem Cells and Neurons ». Neurology Research International 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/807896.

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Objectives.Human breast milk contains a heterogeneous population of cells that have the potential to provide a noninvasive source of cells for cell therapy in many neurodegenerative diseases without any ethical concern. The objectives of this study were to differentiate the breast milk-derived stem cells (BMDSC) toward neural stem cells and then into the neurons and neuroglia.Materials and Methods.To do this, the BMDSC were isolated from human breast milk and cultured in Dulbecco’s modified Eagle medium/F12 (DMEM/F12) containing fibroblast growth factor (bFGF). The cells were then characterized by evaluation of the embryonic and stem cell markers. Then, the cells were exposed to culture medium containing 1% B27 and 2% N2 for 7–10 days followed by medium supplemented with B27, N2, bFGF 10 µg/mL, and endothelial growth factor (EGF) 20 µg/mL. Then, the sphere-forming assay was performed. The spheres were then differentiated into three neural lineages by withdrawing growth factor in the presence of 5% FBS (fetal bovine serum). The immunofluorescence was done forβ-tubulin III, O4, and GFAP (glial fibrillary acidic protein).Results.The results indicated that the cells expressed both embryonic and mesenchymal stem cell (MSC) markers. They also showed neurospheres formation that was nestin-positive. The cells were also differentiated into all three neural lineages.Conclusion.The BMDSC can behave in the same way with neural stem cells. They were differentiated into oligodendrocytes, and astrocytes as well as neurons.

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Braccioli, Luca, Stephin J. Vervoort, Gianmarco Puma, Cora H. Nijboer et Paul J. Coffer. « SOX4 inhibits oligodendrocyte differentiation of embryonic neural stem cells in vitro by inducing Hes5 expression ». Stem Cell Research 33 (décembre 2018) : 110–19. http://dx.doi.org/10.1016/j.scr.2018.10.005.

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Redondo, Carolina, Miguel A. López-Toledano, Maria V. T. Lobo, Rafael Gonzalo-Gobernado, Diana Reimers, Antonio S. Herranz, Carlos L. Paíno et Eulalia Bazán. « Kainic acid triggers oligodendrocyte precursor cell proliferation and neuronal differentiation from striatal neural stem cells ». Journal of Neuroscience Research 85, n^o 6 (2007) : 1170–82. http://dx.doi.org/10.1002/jnr.21245.

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Nguyen, The Duy, Darius Widera, Johannes Greiner, Janine Müller, Ina Martin, Carsten Slotta, Stefan Hauser, Christian Kaltschmidt et Barbara Kaltschmidt. « Prolonged cultivation of hippocampal neural precursor cells shifts their differentiation potential and selects for aneuploid cells ». Biological Chemistry 394, n^o 12 (1 décembre 2013) : 1623–36. http://dx.doi.org/10.1515/hsz-2013-0191.

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Abstract Neural precursor cells (NPCs) are lineage-restricted neural stem cells with limited self-renewal, giving rise to a broad range of neural cell types such as neurons, astrocytes, and oligodendrocytes. Despite this developmental potential, the differentiation capacity of NPCs has been controversially discussed concerning the trespassing lineage boundaries, for instance resulting in hematopoietic competence. Assessing their in vitro plasticity, we isolated nestin+/Sox2+, NPCs from the adult murine hippocampus. In vitro-expanded adult NPCs were able to form neurospheres, self-renew, and differentiate into neuronal, astrocytic, and oligodendrocytic cells. Although NPCs cultivated in early passage efficiently gave rise to neuronal cells in a directed differentiation assay, extensively cultivated NPCs revealed reduced potential for ectodermal differentiation. We further observed successful differentiation of long-term cultured NPCs into osteogenic and adipogenic cell types, suggesting that NPCs underwent a fate switch during culture. NPCs cultivated for more than 12 passages were aneuploid (abnormal chromosome numbers such as 70 chromosomes). Furthermore, they showed growth factor-independent proliferation, a hallmark of tumorigenic transformation. In conclusion, our findings substantiate the lineage restriction of NPCs from adult mammalian hippocampus. Prolonged cultivation results, however, in enhanced differentiation potential, which may be attributed to transformation events leading to aneuploid cells.

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Shouman,, Z., A. Abd-Elmaksoud,, S. Lashen et Hany Marei. « DIFFERENTIATION OF HUMAN OLFACTORY BULB NEURAL STEM CELLS INTO OLIGODENDROCYTES ». Mansoura Veterinary Medical Journal 18, n^o 1 (12 décembre 2017) : 195–207. http://dx.doi.org/10.21608/mvmj.2017.125683.

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Galuta, A., A. Yassin Kassab, D. Ghinda, R. Sandarage, J. Kwan et E. Tsai. « P.235 Differences in Human, Pig, and Rat Spinal Cord Stem Cells in Response to Inflammatory and Regenerative Factors In Vitro ». Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 48, s3 (novembre 2021) : S88. http://dx.doi.org/10.1017/cjn.2021.526.

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Background: While the use of neural stem/progenitor cells has been reported as a promising therapeutic approach for spinal cord injury, direct comparison of adult primary animal spinal cord NSPCs have not been compared to human NSPCs under the same conditions to characterize intrinsic differences between human/animal NSPC response to inflammatory/regenerative factors. Methods: To mimic post-injury inflammation, primary-derived NSPCs from adult humans, pigs, and rats were treated with pro-inflammatory factors.To direct regeneration, NSPCs were treated with retinoic acid, platelet-derived growth factor or bone morphogenic protein-(BMP4) to induce neurons, oligodendrocytes or astrocytes, respectively.Cultures were treated for 7 or 14 days and characterized by immunocytochemistry. Results: Pro-inflammatory factors promoted more astrogenesis in rat and pig NSPCs compared to human NSPCs and induced neuronal differentiation in human NSPCs. RA increased neurogenesis of human and rat NSPCs, PDGFα increased oligodendrocyte differentiation of rat NSPCs, and BMP4 increased astrogenesis of human and rat NSPCs Conclusions: For the first time, differences in response of human, pig and rat primary NSPCs to inflammatory and regenerative factors have been identified. Better understanding of these differences is essential to improving the successful translation of regenerative therapies to humans.

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Setoguchi, Takao, et Toru Kondo. « Nuclear export of OLIG2 in neural stem cells is essential for ciliary neurotrophic factor–induced astrocyte differentiation ». Journal of Cell Biology 166, n^o 7 (27 septembre 2004) : 963–68. http://dx.doi.org/10.1083/jcb.200404104.

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Neural stem cell (NSC) differentiation is precisely controlled by a network of transcription factors, which themselves are regulated by extracellular signals (Bertrand et al., 2002; Shirasakiand and Pfaff, 2002). One way that the activity of such transcription factors is controlled is by the regulation of their movement between the cytosol and nucleus (Vandromme et al., 1996. Lei and Silver, 2002). Here we show that the basic helix–loop–helix transcription factor OLIG2, which has been shown to be required for motor neuron and oligodendrocyte development, is found in the cytoplasm, but not the nucleus, of astrocytes in culture and of a subset of astrocytes in the subventricular zone. We demonstrate that the accumulation of OLIG2 in the nucleus of NSCs blocks the CNTF-induced astrocyte differentiation and that the translocation of OLIG2 to the cytoplasm is promoted by activated AKT. We propose that the AKT-stimulated export of OLIG2 from the nucleus of NSCs is essential for the astrocyte differentiation.

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Kovacs, Gergo, Viktoria Szabo et Melinda K. Pirity. « Absence of Rybp Compromises Neural Differentiation of Embryonic Stem Cells ». Stem Cells International 2016 (2016) : 1–12. http://dx.doi.org/10.1155/2016/4034620.

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Rybp (Ring1 and Yy1 Binding Protein) is a transcriptional regulator and member of the noncanonical polycomb repressive complex 1 with essential role in early embryonic development. We have previously described that alteration of Rybp dosage in mouse models induced striking neural tube defects (NTDs), exencephaly, and disorganized neurocortex. In this study we further investigated the role of Rybp in neural differentiation by utilising wild type (rybp+/+) andrybp nullmutant (rybp-/-) embryonic stem cells (ESCs) and tried to uncover underlying molecular events that are responsible for the observed phenotypic changes. We found thatrybp nullmutant ESCs formed less matured neurons, astrocytes, and oligodendrocytes from existing progenitors than wild type cells. Furthermore, lack ofrybpcoincided with altered gene expression of key neural markers including Pax6 and Plagl1 pinpointing a possible transcriptional circuit among these genes.

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Adams, Tamara L., et Joseph M. Verdi. « Olig1 and Olig2 promotes oligodendrocyte differentiation of neural stem cells in adult mice injured by EAE ». Advances in Bioscience and Biotechnology 03, n^o 05 (2012) : 567–73. http://dx.doi.org/10.4236/abb.2012.35073.

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Hosseini, Kimia, Emilia Lekholm, Aikeremu Ahemaiti et Robert Fredriksson. « Differentiation of Human Embryonic Stem Cells into Neuron, Cholinergic, and Glial Cells ». Stem Cells International 2020 (26 novembre 2020) : 1–9. http://dx.doi.org/10.1155/2020/8827874.

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Human embryonic stem cells (hESCs) are pluripotent cells, capable of differentiation into different cellular lineages given the opportunity. Derived from the inner cell mass of blastocysts in early embryonic development, the cell self-renewal ability makes them a great tool for regenerative medicine, and there are different protocols available for maintaining hESCs in their undifferentiated state. In addition, protocols for differentiation into functional human neural stem cells (hNSCs), which have the potential for further differentiation into various neural cell types, are available. However, many protocols are time-consuming and complex and do not always fit for purpose. In this study, we carefully combined, optimized, and developed protocols for differentiation of hESCs into adherent monolayer hNSCs over a short period of time, with the possibility of both expansion and freezing. Moreover, the method details further differentiation into neurons, cholinergic neurons, and glial cells in a simple, single step by step protocol. We performed immunocytochemistry, qPCR, and electrophysiology to examine the expression profile and characteristics of the cells to verify cell lineage. Using presented protocols, the creation of neuronal cultures, cholinergic neurons, and a mixed culture of astrocytes and oligodendrocytes can be completed within a three-week time period.

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Liu, Bing-Chun, Fang-Yuan Liu, Xin-Yue Gao, Yang-Lin Chen, Qiao-Qiao Meng, Yong-Li Song, Xi-He Li et Si-Qin Bao. « Global Transcriptional Analyses of the Wnt-Induced Development of Neural Stem Cells from Human Pluripotent Stem Cells ». International Journal of Molecular Sciences 22, n^o 14 (12 juillet 2021) : 7473. http://dx.doi.org/10.3390/ijms22147473.

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The differentiation of human pluripotent stem cells (hPSCs) to neural stem cells (NSCs) is the key initial event in neurogenesis and is thought to be dependent on the family of Wnt growth factors, their receptors and signaling proteins. The delineation of the transcriptional pathways that mediate Wnt-induced hPSCs to NSCs differentiation is vital for understanding the global genomic mechanisms of the development of NSCs and, potentially, the creation of new protocols in regenerative medicine. To understand the genomic mechanism of Wnt signaling during NSCs development, we treated hPSCs with Wnt activator (CHIR-99021) and leukemia inhibitory factor (LIF) in a chemically defined medium (N2B27) to induce NSCs, referred to as CLNSCs. The CLNSCs were subcultured for more than 40 passages in vitro; were positive for AP staining; expressed neural progenitor markers such as NESTIN, PAX6, SOX2, and SOX1; and were able to differentiate into three neural lineage cells: neurons, astrocytes, and oligodendrocytes in vitro. Our transcriptome analyses revealed that the Wnt and Hedgehog signaling pathways regulate hPSCs cell fate decisions for neural lineages and maintain the self-renewal of CLNSCs. One interesting network could be the deregulation of the Wnt/β-catenin signaling pathway in CLNSCs via the downregulation of c-MYC, which may promote exit from pluripotency and neural differentiation. The Wnt-induced spinal markers HOXA1-4, HOXA7, HOXB1-4, and HOXC4 were increased, however, the brain markers FOXG1 and OTX2, were absent in the CLNSCs, indicating that CLNSCs have partial spinal cord properties. Finally, a CLNSC simple culture condition, when applied to hPSCs, supports the generation of NSCs, and provides a new and efficient cell model with which to untangle the mechanisms during neurogenesis.

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Sharma, Krishna D., Karrer M. Alghazali, Ambar B. Rangumagar, Anindya Ghosh, Alexandru S. Biris et Jennifer Y. Xie. « Nanostructured surfaces promote differentiation of rat neural stem cells into oligodendrocytes ». IBRO Reports 6 (septembre 2019) : S380. http://dx.doi.org/10.1016/j.ibror.2019.07.1208.

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Younesi, Behnam, et Mahnaz Azarnia. « Investigating Differentiation Ability of Induced Pluripotent Stem (Ips) Cell and Endometrial Stromal Cells (Enscs) Toward Pre-Oligodendrocytes using Growth Factors In Vitro ». Biosciences, Biotechnology Research Asia 14, n^o 2 (25 juin 2017) : 697–707. http://dx.doi.org/10.13005/bbra/2497.

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ABSTRACT: Oligodendrocytes are types of cells in central neural system (CNS). Their main function is generation of Myelin sheath in CNS, this sheath insulates the Axons. Any disorder in the function of these cells leads to demyelination of neurons and causes neural disorders including multiple sclerosis (MS). Nowadays, cell therapy provides plenty of hope for cure of MS. So far it has used different sources such as stem cells or progenitor for cell therapy of neural system. But each of them had some limitations, for instance using neural stem cells requires certain amount of CNS tissue. Embryonic stem cells also introduced as another candidate for cell therapy but due to some moral problems, such as necessity to creating a Blastocyst, using these cells accompanied many limitations. In cell therapy, the most important factor is facility to acquiring stem cells. iPS cells are kinds of Induced Pluripotent Stem cells which directly created by transferring of 4 transcription factors: oct4, sox2, klf2, and c-Myc into the differentiated cells. iPS cells are like pluripotent embryonic stem cells although they do not require demolition of Blastocyte. Endometrial Stromal cells are kinds of mesenchyme or adult cells which have been proven in human and mice’s uterine endometrial and they are easy to access. Both of these types of cells can be appropriate candidates for cell therapy. In this research we use these two types of cells for differentiate to Oligodendrocytes and we are able to differentiate iPS cells which are from human's eye and also human Endometrial Stromal cells to pre-Oligodendrocytes. Also we can compare their differentiation ability. These cells can be used for transplanting in MS patients.

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Park, Yu Mi, Jae Hwan Kim et Jong Eun Lee. « Neural Stem Cells Overexpressing Arginine Decarboxylase Improve Functional Recovery from Spinal Cord Injury in a Mouse Model ». International Journal of Molecular Sciences 23, n^o 24 (13 décembre 2022) : 15784. http://dx.doi.org/10.3390/ijms232415784.

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Current therapeutic strategies for spinal cord injury (SCI) cannot fully facilitate neural regeneration or improve function. Arginine decarboxylase (ADC) synthesizes agmatine, an endogenous primary amine with neuroprotective effects. Transfection of human ADC (hADC) gene exerts protective effects after injury in murine brain-derived neural precursor cells (mNPCs). Following from these findings, we investigated the effects of hADC-mNPC transplantation in SCI model mice. Mice with experimentally damaged spinal cords were divided into three groups, separately transplanted with fluorescently labeled (1) control mNPCs, (2) retroviral vector (pLXSN)-infected mNPCs (pLXSN-mNPCs), and (3) hADC-mNPCs. Behavioral comparisons between groups were conducted weekly up to 6 weeks after SCI, and urine volume was measured up to 2 weeks after SCI. A subset of animals was euthanized each week after cell transplantation for molecular and histological analyses. The transplantation groups experienced significantly improved behavioral function, with the best recovery occurring in hADC-mNPC mice. Transplanting hADC-mNPCs improved neurological outcomes, induced oligodendrocyte differentiation and remyelination, increased neural lineage differentiation, and decreased glial scar formation. Moreover, locomotor and bladder function were both rehabilitated. These beneficial effects are likely related to differential BMP-2/4/7 expression in neuronal cells, providing an empirical basis for gene therapy as a curative SCI treatment option.

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Sharma, Krishna Deo, Karrer M. Alghazali, Rabab N. Hamzah, Sahitya Chetan Pandanaboina, Zeid A. Nima Alsudani, Malek Muhi, Fumiya Watanabe, Guo-Lei Zhou, Alexandru S. Biris et Jennifer Yanhua Xie. « Gold Nanorod Substrate for Rat Fetal Neural Stem Cell Differentiation into Oligodendrocytes ». Nanomaterials 12, n^o 6 (11 mars 2022) : 929. http://dx.doi.org/10.3390/nano12060929.

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Gold nanorods (AuNRs) have been proposed to promote stem cell differentiation in vitro and in vivo. In this study, we examined a particular type of AuNR in supporting the differentiation of rat fetal neural stem cells (NSCs) into oligodendrocytes (ODCs). AuNRs were synthesized according to the seed-mediated method resulting in nanorods with an aspect ratio of around 3 (~12 nm diameter, 36 nm length) and plasmon resonance at 520 and 780 nm, as confirmed by transmission electron microscopy (TEM) and UV-vis spectroscopy, respectively. A layer-by-layer approach was used to fabricate the AuNR substrate on the functionalized glass coverslips. NSCs were propagated for 10 days using fibroblast growth factor, platelet-derived growth-factor-supplemented culture media, and differentiated on an AuNR or poly-D-lysine (PDL)-coated surface using differentiation media containing triiodothyronine for three weeks. Results showed that NSCs survived better and differentiated faster on the AuNRs compared to the PDL surface. By week 1, almost all cells had differentiated on the AuNR substrate, whereas only ~60% differentiated on the PDL surface, with similar percentages of ODCs and astrocytes. This study indicates that functionalized AuNR substrate does promote NSC differentiation and could be a viable tool for tissue engineering to support the differentiation of stem cells.

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Pai, Sadashiva, Florence Verrier, Haiyan Sun, Haibei Hu, Ann M. Ferrie, Azita Eshraghi et Ye Fang. « Dynamic Mass Redistribution Assay Decodes Differentiation of a Neural Progenitor Stem Cell ». Journal of Biomolecular Screening 17, n^o 9 (10 août 2012) : 1180–91. http://dx.doi.org/10.1177/1087057112455059.

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Stem cells hold great potential in drug discovery and development. However, challenges remain to quantitatively measure the functions of stem cells and their differentiated products. Here, we applied fluorescent imaging, quantitative real-time PCR, and label-free dynamic mass redistribution (DMR) assays to characterize the differentiation process of the ReNcell VM human neural progenitor stem cell. Immunofluorescence imaging showed that after growth factor withdrawal, the neuroprogenitor stem cell was differentiated into dopaminergic neurons, astrocytes, and oligodendrocytes, thus creating a neuronal cell system. High-performance liquid chromatography analysis showed that the differentiated cell system released dopamine upon depolarization with KCl. In conjunction with quantitative real-time PCR, DMR assays using a G-protein-coupled receptor agonist library revealed that a subset of receptors, including dopamine D1 and D4 receptors, underwent marked alterations in both receptor expression and signaling pathway during the differentiation process. These findings suggest that DMR assays can decode the differentiation process of stem cells at the cell system level.

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Bużańska, L., E. K. Machaj, B. Zabłocka, Z. Pojda et K. Domańska-Janik. « Human cord blood-derived cells attain neuronal and glial features in vitro ». Journal of Cell Science 115, n^o 10 (15 mai 2002) : 2131–38. http://dx.doi.org/10.1242/jcs.115.10.2131.

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Neural stem cells are clonogenic, self-renewing cells with the potential to differentiate into brain-specific cell lines. Our study demonstrates that a neural-stem-cell-like subpopulation can be selected and expanded in vitro by the use of human umbilical cord blood cells, which are a relatively easily available starting material. Through a combination of antigen-driven magnetic cell sorting and subfractionation according to cell surface adhesive properties, we have isolated a clonogenic fraction devoid of hematopoietic or angiogenetic properties but with relatively high self-renewal potency. The resulting clones express nestin, a neurofilament protein that is one of the most specific markers of multipotent neural stem cells. In the presence of selected growth factors or in the rat brain co-culture system, the progeny of these cells can be oriented towards the three main neural phenotypes: neurons,astroglia and oligodendroglia. The cells show high commitment (about 30% and 40% of the population) to neuronal and astrocytic fate, respectively. Interestingly, upon differentiation, the neural-type precursor cells of cord blood origin also give rise to a relatively high proportion of oligodendrocytes — 11% of the total population of differentiating cells.

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