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Ascorbate effect on serum free cultured hESC

ABSTRACT: Ascorbate activates CD30 expression and causes widespread specific demethylation of the epigenome of serum free cultured hESC. The genetic and epigenetic integrity of human Embryonic Stem cells (hESCs) is critical to their future applications in research and medicine. hESC cultured in serum free media can accumulate point mutations, aneuploidy and progressive epigenetic changes over prolonged culture in vitro. We have identified ascorbate as the only molecule in the very widely used Knock-out serum replacement medium that is sufficient to induce expression of CD30, a biomarker for aneuploidy in hESCs. In fact, we show that hESC cultured in the presence of ascorbate for 20 passages not only display demethylation of the CD30 locus, but exhibit widespread and remarkably specific and consistent demethylation of 1,847 genes in both HES2 and HES3 cells. The specific ascorbate induced demethylation changes in the hESC epigenome, of which 86% are shared between the two lines, identify a subset of genes in hESC, including CD30, that are sensitive to serum free culture medium induced epigenetic changes. Experiment. HES2 cells were maintained on 20% Fetal calf serum on mouse embryonic fibroblast feeder layers with mechanical dissection. Using HES2 after 99 mechanical passages (P99), hESC were grown for 17-20 (+17 - +20) passages in the presence of 20% Knock-Out Serum Replacement (Invitrogen) either with (+ASC) or without (-ASC) Ascorbate with enzymatic culturing.

ORGANISM(S): Homo sapiens

PROVIDER: GSE16590 | GEO | 2010/06/10

SECONDARY ACCESSION(S): PRJNA116155

REPOSITORIES: GEO

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Ascorbate effect on serum free cultured hESC

Project description:Ascorbate activates CD30 expression and causes widespread specific demethylation of the epigenome of serum free cultured hESC. The genetic and epigenetic integrity of human Embryonic Stem cells (hESCs) is critical to their future applications in research and medicine. hESC cultured in serum free media can accumulate point mutations, aneuploidy and progressive epigenetic changes over prolonged culture in vitro. We have identified ascorbate as the only molecule in the very widely used Knock-out serum replacement medium that is sufficient to induce expression of CD30, a biomarker for aneuploidy in hESCs. In fact, we show that hESC cultured in the presence of ascorbate for 20 passages not only display demethylation of the CD30 locus, but exhibit widespread and remarkably specific and consistent demethylation of 1,847 genes in both HES2 and HES3 cells. The specific ascorbate induced demethylation changes in the hESC epigenome, of which 86% are shared between the two lines, identify a subset of genes in hESC, including CD30, that are sensitive to serum free culture medium induced epigenetic changes. Experiment. HES2 cells were maintained on 20% Fetal calf serum on mouse embryonic fibroblast feeder layers with mechanical dissection. Using HES2 after 99 mechanical passages (P99), hESC were grown for 17-20 (+17 - +20) passages in the presence of 20% Knock-Out Serum Replacement (Invitrogen) either with (+ASC) or without (-ASC) Ascorbate with enzymatic culturing. RNA (FACs sorted for the presence of the pluripotent stem marker TG30) from three passages (17, 19 and 20) (replicates) for both +ASC and âASC samples were arrayed.

2010-06-23 | E-GEOD-16590 | biostudies-arrayexpress

Direct comparison of HES2 ESC overexpressing CD30 variant with HES2 overexpressing GFP

Project description:HES2 ESC were infected with a lentivirus construct containing either CD30 (TNFRSF8) extracellular deficient variant or GFP, using the ViraPowerâ?¢ Promoterless Lentiviral GatewayÂ® Kits (Invitrogen). HES2 cells were recovered and grown for 19 passages. HES2 were commonly grown on Mouse Embryonic Feeder cells in the presence of KSOR media. Before collection of RNA, ES cells were FACs sorted with antibodies to GCMT-2 and CD9 to separate ES cells from differentiated cells and mouse feeders. The experiment was repeated in triplicate. The final aim was to deduce the effect of overexpressing the variant form of CD30 on gene expression in HES2 cells. Three consecutive passages of HES2 cells over-expressing either CD30V or GFP were grown and subject to FACs sorting, collection and microarray. A total of 6 samples, (3 replicates of these 2 populations) were used in the experiment.

2010-04-08 | E-GEOD-13261 | biostudies-arrayexpress

Homo sapiens

Project description:Ascorbate effect on serum free cultured hESC

| PRJNA116155 | ENA

Direct comparison of HES2 ESC overexpressing CD30 variant with HES2 overexpressing GFP

Project description:HES2 ESC were infected with a lentivirus construct containing either CD30 (TNFRSF8) extracellular deficient variant or GFP, using the ViraPower™ Promoterless Lentiviral Gateway® Kits (Invitrogen). HES2 cells were recovered and grown for 19 passages. HES2 were commonly grown on Mouse Embryonic Feeder cells in the presence of KSOR media. Before collection of RNA, ES cells were FACs sorted with antibodies to GCMT-2 and CD9 to separate ES cells from differentiated cells and mouse feeders. The experiment was repeated in triplicate. The final aim was to deduce the effect of overexpressing the variant form of CD30 on gene expression in HES2 cells.

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ESC (HES2, MEL1 or H9) grown in various conditions and FACs sorted for GCTM-2 and CD9

Project description:In the following experiment, three different hESC cell lines (HES2, MEL1 and H9) were grown in the presence of KOSR, KOSR or mTESR containing media respectively. KOSR (Knockout serum replacement medium) is a standard media allowing the growth of hESC without the need for manual passaging - Enzymatic passaging is used instread. mTESR (Ludwig et al., 2007) is a media allowing the growth of hESC on matrigel with enzymatic passaging. At day 7 after passaging, these cells were FACs sorted for the presence of GCTM-2 and CD9 into 4 distinct fractions (p4: GCTM-2-neg, CD9-neg; p5: GCTM-2-low, CD9-low; p6: GCTM-2-medium, CD9-medium and p7: GCTM-2-high, CD9-high). For each cell line-subfraction combination, RNA was harvested and subject to microarray. From each experiment (individual cell line), 4 samples were collected (p4, p5, p6 and p7) and these were subject to microarray. In each case the experiment was performed in triplicate Three independent experiments of three consecutive passages of ESC cells were grown and subject to FACs sorting, collection and microarray. A total of 36 samples, (3 experiments of 3 replicates of 4 sorted populations of cells (p4, p5, p6, p7))

2010-04-07 | E-GEOD-13877 | biostudies-arrayexpress

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Project description:Direct comparison of HES2 ESC overexpressing CD30 variant with HES2 overexpressing GFP

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Project description:The membrane fraction and the cytosolic fraction of HES2 cells were collected and subjected to microarray. The experiment was performed in triplicate Keywords: membrane-polysome fractionation of RNA Three consecutive passages of HES2 cells were grown and subject to membrane-polysome fractionation. A total of 6 samples, (3 replicates of 2 fractions) were included in the experiment

2010-04-07 | E-GEOD-14037 | biostudies-arrayexpress

ROCK Inhibition extends passage of human embryonic stem cell derived retinal pigmented epithelium

Project description:Human embryonic stem cell derived retinal pigmented epithelial cells (hESC-RPE) are in clinical trials for the treatment of macular diseases. Currently, these cells take over three months to derive and subsequent months to mature and characterize. After only five to six passages the cells begin to undergo an epithelial-to-mesenchymal transition and are unsuitable for cellular therapies. We describe a novel passaging protocol and show that inhibition of Rho-associated, coiled coil containing protein kinases (ROCK1 and ROCK2) using Y-27632, allows extended passage of hESC-RPE in serum-free culture with maintenance of the RPE phenotype. After 30 population doublings, hESC-RPE at passage 13 maintain normal karyotype, display typical, polarized epithelial morphology, and continue to express RPE-specific genes. Passage 13 hESC-RPE show protein localization patterns similar to passage 2 cells, and display similar levels of growth factor secretion and phagocytosis of photoreceptor outer segments. Microarray analysis from day 2 cells shows several key pathways are altered by ROCK inhibition, including stimulation of the cell cycle and suppression of TGFβ and Wnt signaling. These findings describe a means to greatly increase the yield of functional hESC-RPE for use in research and clinical trials.

2014-06-30 | GSE56618 | GEO

HES2 embryonic stem cells (ESCs) grown in standard conditions and FACs sorted for GCTM-2 and CD9

Project description:HES2 ESCs were grown in standard ES culture conditions. After 1 week, these cells were FACs sorted for the presence of GCTM-2 and CD9. Keywords: Sorted cell comparison Three consecutive passages of HES2 cells were grown and subjected to FACs sorting. For each, 4 sorted populations of cells (p4, p5, p6, p7) were collected and these were subjected to microarray. A total of 12 samples: 3 replicates each of p4, p5, p6, and p7.

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Generation of feederless iPS cell from human cord blood cells using Sendai virus (SeV) vector

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