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Project description:Reconstitution of germ cell fate from pluripotent stem cells provide the opportunities to understand the molecular underpinning of germ cell development. Here, we established a several culture methods of induced pluripotent stem cells (iPSCs) in common marmoset (Callithrix jacchus, cj), which stably propagate in an undifferentiated state. Notably, iPSCs cultured on feeder layer in the presence of a WNT signaling inhibitor upregulate genes related to ubiquitin-dependent protein catabolic process and acquire permissive state that readily differentiate into primordial germ cell-like cells (PGCLCs) bearing immunophenotypic and transcriptomic similarities to pre-migratory cjPGCs. Induction of cjPGCLCs accompanies transient upregulation of mesodermal genes and culminate in establishing primate-specific transcriptional network similar to humans and cynomolgus monkeys. Moreover, cjPGCLCs can be expanded in monolayer while retaining cellular state. Upon co-culture with mouse testicular somatic cells, these cells acquire DDX4+ early prospermatogonia-like state. Our findings provide a framework for understanding and reconstituting germ cell development in marmoset in vitro, which serve as an comparative tool and foundation for a preclinical model for human in vitro gametogenesis.
2023-02-17 | GSE210575 | GEO
Project description:Reconstitution of germ cell fate from pluripotent stem cells provide the opportunities to understand the molecular underpinning of germ cell development. Here, we established a several culture methods of induced pluripotent stem cells (iPSCs) in common marmoset (Callithrix jacchus, cj), which stably propagate in an undifferentiated state. Notably, iPSCs cultured on feeder layer in the presence of a WNT signaling inhibitor upregulate genes related to ubiquitin-dependent protein catabolic process and acquire permissive state that readily differentiate into primordial germ cell-like cells (PGCLCs) bearing immunophenotypic and transcriptomic similarities to pre-migratory cjPGCs. Induction of cjPGCLCs accompanies transient upregulation of mesodermal genes and culminate in establishing primate-specific transcriptional network similar to humans and cynomolgus monkeys. Moreover, cjPGCLCs can be expanded in monolayer while retaining cellular state. Upon co-culture with mouse testicular somatic cells, these cells acquire DDX4+ early prospermatogonia-like state. Our findings provide a framework for understanding and reconstituting germ cell development in marmoset in vitro, which serve as an comparative tool and foundation for a preclinical model for human in vitro gametogenesis.
2023-02-17 | GSE209932 | GEO
Project description:Reconstitution of germ cell fate from pluripotent stem cells provide the opportunities to understand the molecular underpinning of germ cell development. Here, we established a several culture methods of induced pluripotent stem cells (iPSCs) in common marmoset (Callithrix jacchus, cj), which stably propagate in an undifferentiated state. Notably, iPSCs cultured on feeder layer in the presence of a WNT signaling inhibitor upregulate genes related to ubiquitin-dependent protein catabolic process and acquire permissive state that readily differentiate into primordial germ cell-like cells (PGCLCs) bearing immunophenotypic and transcriptomic similarities to pre-migratory cjPGCs. Induction of cjPGCLCs accompanies transient upregulation of mesodermal genes and culminate in establishing primate-specific transcriptional network similar to humans and cynomolgus monkeys. Moreover, cjPGCLCs can be expanded in monolayer while retaining cellular state. Upon co-culture with mouse testicular somatic cells, these cells acquire DDX4+ early prospermatogonia-like state. Our findings provide a framework for understanding and reconstituting germ cell development in marmoset in vitro, which serve as an comparative tool and foundation for a preclinical model for human in vitro gametogenesis.
2023-02-17 | GSE218108 | GEO
Project description:Reconstitution of germ cell fate from pluripotent stem cells provide the opportunities to understand the molecular underpinning of germ cell development. Here, we established a several culture methods of induced pluripotent stem cells (iPSCs) in common marmoset (Callithrix jacchus, cj), which stably propagate in an undifferentiated state. Notably, iPSCs cultured on feeder layer in the presence of a WNT signaling inhibitor upregulate genes related to ubiquitin-dependent protein catabolic process and acquire permissive state that readily differentiate into primordial germ cell-like cells (PGCLCs) bearing immunophenotypic and transcriptomic similarities to pre-migratory cjPGCs. Induction of cjPGCLCs accompanies transient upregulation of mesodermal genes and culminate in establishing primate-specific transcriptional network similar to humans and cynomolgus monkeys. Moreover, cjPGCLCs can be expanded in monolayer while retaining cellular state. Upon co-culture with mouse testicular somatic cells, these cells acquire DDX4+ early prospermatogonia-like state. Our findings provide a framework for understanding and reconstituting germ cell development in marmoset in vitro, which serve as an comparative tool and foundation for a preclinical model for human in vitro gametogenesis.
2023-02-17 | GSE210553 | GEO
Project description:Primordial germ cells (PGCs) share many properties with embryonic stem cells (ESCs) and innately express several key pluripotency-controlling factors, including OCT4, NANOG, and LIN28. Therefore, PGCs may provide a simple and efficient model for studying somatic cell reprogramming to induced pluripotent stem cells (iPSCs), especially in determining the regulatory mechanisms that fundamentally define pluripotency. Here, we report a novel model of PGC reprogramming to generate iPSCs via transfection with SOX2 and OCT4 using integrative lentiviral. We also show the feasibility of using nonintegrative approaches for generating iPSC from PGCs using only these two factors. We show that human PGCs express endogenous levels of KLF4 and C-MYC protein at levels similar to embryonic germ cells (EGCs) but lower levels of SOX2 and OCT4. Transfection with both SOX2 and OCT4 together was required to induce PGCs to a pluripotent state at an efficiency of 1.71%, and the further addition of C-MYC increased the efficiency to 2.33%. Immunohistochemical analyses of the SO-derived PGC-iPSCs revealed that these cells were more similar to ESCs than EGCs regarding both colony morphology and molecular characterization. Although leukemia inhibitory factor (LIF) was not required for the generation of PGC-iPSCs like EGCs, the presence of LIF combined with ectopic exposure to C-MYC yielded higher efficiencies. Additionally, the SO-derived PGC-iPSCs exhibited differentiation into representative cell types from all three germ layers in vitro and successfully formed teratomas in vivo. Several lines were generated that were karyotypically stable for up to 24 subcultures. Their derivation efficiency and survival in culture significantly supersedes that of EGCs, demonstrating their utility as a powerful model for studying factors regulating pluripotency in future studies.
| S-EPMC4652187 | biostudies-literature
Project description:BACKGROUND:Specification of primordial germ cells (PGCs) results in the conversion of pluripotent epiblast cells into monopotent germ cell lineage. Blimp1/Prmt5 complex plays a critical role in the specification and maintenance of the early germ cell lineage. However, PGCs can be induced to dedifferentiate back to a pluripotent state as embryonic germ (EG) cells when exposed to exogenous signaling molecules, FGF-2, LIF and SCF. METHODOLOGY AND PRINCIPAL FINDINGS:Here we show that Trichostatin A (TSA), an inhibitor of histone deacetylases, is a highly potent agent that can replace FGF-2 to induce dedifferentiation of PGCs into EG cells. A key early event during dedifferentiation of PGCs in response to FGF-2 or TSA is the down-regulation of Blimp1, which reverses and apparently relieves the cell fate restriction imposed by it. Notably, the targets of Blimp1, which include c-Myc and Klf-4, which represent two of the key factors known to promote reprogramming of somatic cells to pluripotent state, are up-regulated. We also found early activation of the LIF/Stat-3 signaling pathway with the translocation of Stat-3 into the nucleus. By contrast, while Prmt5 is retained in EG cells, it translocates from the nucleus to the cytoplasm where it probably has an independent role in regulating pluripotency. CONCLUSIONS/SIGNIFICANCE:We propose that dedifferentiation of PGCs into EG cells may provide significant mechanistic insights on early events associated with reprogramming of committed cells to a pluripotent state.
| S-EPMC2567847 | biostudies-literature
Project description:BACKGROUND:Premature ovarian insufficiency (POI) is a common disease in reproductive women. The pathogenesis of POI is not clear, although it is known that it involves the disorder of oocyte differentiation and development. The introduction of reprogramming human somatic cells into induced pluripotent stem cells (iPSCs) offers a unique opportunity to study many aspects of POI from cell differentiation in vitro that could ultimately lead to novel drug development and testing to help treat the disorder. METHODS:The fibroblasts from POI patients, including fragile X syndrome, abnormal karyotype (45, X; 45, X/46, XX; 45, XO and 47, XXX), and the gene mutation (FIGLA and GDF9) were reprogrammed to pluripotency status by retroviral transduction using defined factors. The morphology, growth characteristics, gene expression profiles, epigenetic status, and in vitro and in vivo differentiation potential of the POI-1-iPSCs (from fragile X syndrome) were analyzed. Then, POI-1-iPSCs were induced to differentiation into primordial germ cells (PGCs) with DNA methyltransferase inhibitors. RESULTS:The iPSCs were successfully generated from POI patients' fibroblasts. The formed iPS clones have the same characteristics of human ESCs. POI-1-iPSCs were successfully generated with germline competence. The POI-1-iPSCs, with genotypes of fragile X syndrome, can be induced to differentiation into PGCs with high efficiency under our culture system by DNA demethylation. This study proved that disease-specific iPSC lines derived from POI patients could be generated and successfully differentiated into PGCs. CONCLUSIONS:We established some novel, systemic cell models for the studying of the pathogenesis of POI patients. Second, DNA demethylation may accelerate the induction of human PGCs from iPSCs in vitro and the conclusion needs further exploration. This represents an important step in the novel approach for the study of the pathophysiology and potential egg resource for POI patients.
| S-EPMC6545034 | biostudies-literature
Project description:Background:The mechanisms underlying human germ cell development and infertility remain largely unknown due to bioethical issues and the shortage of experimental materials. Therefore, an effective in vitro induction system of human primordial germ-like cells (hPGCLCs) from human pluripotent stem cells (hPSC) is in high demand. The current strategies used for the generation of hPGCLCs are not only costly but also difficult to perform at a large scale, thereby posing barriers to further research. In this study, we attempted to solve these problems by providing a new 3D culture system for hPGCLC differentiation. Methods:The efficiency and relative yield of a methylcellulose (MC)-based 3D hPGCLC induction system were first compared with that of a conventional U96 system. Then, we examined the gene expression of germ cell marker genes and the key epigenetic modifications of the EpCAM-/INTEGRIN?6-high cells from the 3D MC induction system and the U96 system via quantitative PCR and immunofluorescence. Finally, the reliability of the MC-based 3D hPGCLC induction system was evaluated via the generation of induced pluripotent stem cells (iPSCs) from the testicular cells of one patient with obstructive azoospermia (OA) and followed by the subsequent differentiation of iPSCs into the germ cell lineage. Results:In the present study, we demonstrated that the 3D MC induction system combined with low-cell attachment plates facilitated the generation of hPGCLCs at a large scale. We found that the hPGCLCs generated via the MC system shared similar characteristics to that via the U96 system in terms of the gene expression profiles, germ cell-specific markers, epigenetic modification states and cellular states. In addition, hPGCLCs from iPSCs derived from one OA patient were generated with high efficiency via the present 3D MC induction system. Discussion:The in vitro induction of hPGCLCs from human embryonic stem cells (hESCs)/human induced pluripotent stem cells (hiPSCs) has significant implications in exploring the underlying mechanisms of the origin and specification of hPGCs and the epigenetic programming of the human germ line as well as treating male infertility. Here, we developed a simple and efficient 3D induction system to generate hPGCLCs from hESCs/hiPSCs at a large scale, which facilitated the study of human germ cell development and stem cell-based reproductive medicine.
| S-EPMC6330037 | biostudies-literature
Project description:Induced pluripotent stem (iPS) cells have great potential for regenerative medicine and gene therapy. Thus far, iPS cells have typically been generated using integrating viral vectors expressing various reprogramming transcription factors; nonintegrating methods have been less effective and efficient. Because there is a significant risk of malignant transformation and cancer involved with the use of iPS cells, careful evaluation of transplanted iPS cells will be necessary in small and large animal studies before clinical application. Here, we have generated and characterized nonhuman primate iPS cells with the goal of evaluating iPS cell transplantation in a clinically relevant large animal model. We developed stable Phoenix-RD114-based packaging cell lines that produce OCT4, SOX2, c-MYC, and KLF4 (OSCK) expressing gammaretroviral vectors. Using these vectors in combination with small molecules, we were able to efficiently and reproducibly generate nonhuman primate iPS cells from pigtailed macaques (Macaca nemestrina). The established nonhuman primate iPS cells exhibited pluripotency and extensive self-renewal capacity. The facile and reproducible generation of nonhuman primate iPS cells using defined producer cells as a source of individual reprogramming factors should provide an important resource to optimize and evaluate iPS cell technology for studies involving stem cell biology and regenerative medicine.
| S-EPMC3128793 | biostudies-literature
Project description:Induced pluripotent stem (iPS) cells hold great promise for regenerative medicine. To overcome potential problems associated with transgene insertions, efforts have been directed over the past several years to generate transgene-free iPS cells by using non-viral-vector approaches. To date, however, cells generated through such procedures have had problems producing reproductively competent animals, suggesting that their quality needed further improvement. Here we report the use of optimized assemblies of reprogramming factors and selection markers incorporated into single plasmids as nonintegrating episomes to generate germ-line-competent iPS cells. In particular, the pMaster12 episome can produce transgene-free iPS cells that, when grown in 2i medium, recapitulate good mouse ES cells, in terms of their competency for generating germ-line chimeras.
| S-EPMC4115572 | biostudies-literature