Unknown,Transcriptomics,Genomics,Proteomics

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Gene Expression Profiling of Human Embryonic Neural Stem Cells and Dopaminergic Neurons from Adult Human Substantia Nigra

ABSTRACT: Our goal was to develop a list of genes that could be used effectively to highlight the genomic profiling of human embryonic neural stem cells (hENSCs), and to identify genes involved in the process of their differentiation to dopaminergic (DA) neurons. Our results showed that Agilent's Whole Human Genome Oligonucleotide Microarray permits the monitoring of at least 41000 genes as cells differentiate. In this study, we identified 13525 genes to be differentially expressed between undifferentiated hENSC and DA cells isolated from human substansia nigra. Approximately 3737 genes were up-regulated in the embryonic NSC, and 4116 genes were up-regulated in DA cells. Careful analysis of the emerged data using the web-accessible program named Database for Annotation, Visualization and Integrated Discovery (DAVID) has permitted us to distinguish several genes and pathways that are involved in dopaminergic differentiation, and to identify the crucial signaling pathways that direct the process of differentiation. Our study elucidated that genes related to midbrain development, such as Nr4a2 (nuclear receptor subfamily 4, group A, member 2, Nurr1) and En1 (engrailed 1), were increased to 3.76- and 6.41-folds, respectively. In addition, the transcriptions of the genes for DA neuron phenotype, such as Ddc (doapmine decarboxylase, AADC), Slc6a3 (solute carrier family 6, member 3, DAT), and Th (tyrosine hydroxylase), were significantly increased to 8.08, 4.01, and 5.91, respectively. As data accumulate with different populations and different methods of differentiation, one will perhaps be able to identify the key regulators and biomarkers that may allow selective selection of limited number of genes or transcription factors to be used for direct reprogramming of NSC into DA cells, with an ultimate goal of obtaining different types of allogenic neurons including personalized DA neurons to be used in replacement therapy for neurodegenerative diseases such as Parkinson's disease (PD). Two-condition experiment: hENSC S vs. DA cells. Biological replicates: 2 hENSC, and 2 DA neuron samples from human substantia nigra cells.

ORGANISM(S): Homo sapiens

SUBMITTER: Hany Marei

PROVIDER: E-GEOD-25931 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Our goal was to develop a list of genes that could be used effectively to highlight the genomic profiling of human embryonic neural stem cells (hENSCs), and to identify genes involved in the process of their differentiation to dopaminergic (DA) neurons. Our results showed that Agilent's Whole Human Genome Oligonucleotide Microarray permits the monitoring of at least 41000 genes as cells differentiate. In this study, we identified 13525 genes to be differentially expressed between undifferentiated hENSC and DA cells isolated from human substansia nigra. Approximately 3737 genes were up-regulated in the embryonic NSC, and 4116 genes were up-regulated in DA cells. Careful analysis of the emerged data using the web-accessible program named Database for Annotation, Visualization and Integrated Discovery (DAVID) has permitted us to distinguish several genes and pathways that are involved in dopaminergic differentiation, and to identify the crucial signaling pathways that direct the process of differentiation. Our study elucidated that genes related to midbrain development, such as Nr4a2 (nuclear receptor subfamily 4, group A, member 2, Nurr1) and En1 (engrailed 1), were increased to 3.76- and 6.41-folds, respectively. In addition, the transcriptions of the genes for DA neuron phenotype, such as Ddc (doapmine decarboxylase, AADC), Slc6a3 (solute carrier family 6, member 3, DAT), and Th (tyrosine hydroxylase), were significantly increased to 8.08, 4.01, and 5.91, respectively. As data accumulate with different populations and different methods of differentiation, one will perhaps be able to identify the key regulators and biomarkers that may allow selective selection of limited number of genes or transcription factors to be used for direct reprogramming of NSC into DA cells, with an ultimate goal of obtaining different types of allogenic neurons including personalized DA neurons to be used in replacement therapy for neurodegenerative diseases such as Parkinson's disease (PD).

Project description:Induced pluripotent stem cells (iPSCs) hold great promise for in vitro disease modeling and cell replacement therapy for Parkinson’s disease (PD). Both applications crucially require an in-depth profiling of the disease-relevant, iPSC-derived cell type. Midbrain dopaminergic (mDA) neurons derived from pluripotent stem cells are of substantial interest because of their instrumental value for PD therapy. IPSC-derived mDA neuron-like cells have been generated, however, detailed genetic and epigenetic characterization of strictly purified in vitro generated DA neurons has so far lagged behind. We generated mouse Pitx3gfp/+ iPSC-derived DA neurons that, after fluorescent activated cell sorting (FACS) allowed comprehensive comparison to mesodiencephalic dopaminergic (mdDA) neurons from Fac-sorted Pitx3gfp/+ ventral midbrains. We performed detailed analysis of global gene expression and genome-scale DNA methylation of CpG islands (CGIs) by reduced representation bisulfite sequencing. The reprogramming pathway from fibroblasts to iPSCs left parental cell footprints for both gene expression and DNA methylation. However, most gene expression patterns of iPSC-derived DA neurons closely resembled that of primary mdDA neurons with the strongest correlations for mdDA specific genes. Also, for DNA methylation patterns, high similarities were found for the vast majority of CGIs when comparing primary mdDA neurons with iPSC-derived DA neurons. Additionally, we found de novo DNA methylation during in vitro differentiation for hundreds of genes specifically in lineage-committed neural precursors that persisted in iPSC-derived DA neurons. Our study provides novel detailed characteristics of iPSC-derived DA neurons in comparison to the primary cell type. These findings add important information to our knowledge about these biomedically highly valuable, in vitro generated neurons. Microarray expression study comparing 3 samples of facs-sorted, Pitx3-gfp positive cells from each experimental group to a common reference consisting of adult mouse midbrain RNA. Each sample was analysed in normal and opposite dye orientation.

Project description:The identified stromal factors SDF1alpha, sFRP1 and VEGFD induce dopaminergic neuron differentiation of human pluripotent stem cells. Human embryonic stem cell (hESC)-derived dopaminergic (DA) neurons are potentially useful for treating Parkinson’s disease (PD) through cell replacement therapy. Generation of DA neurons from hESCs has been achieved by co-culture with the stromal cell line PA6, a source of stromal cell-derived inducing activity (SDIA). However, the factor(s) produced by stromal cells that constitute SDIA is unknown. We previously reported that medium conditioned by PA6 cells can generate functional DA neurons in the human embryonal carcinoma stem cell line, NTera2. Here we further examined the effects of PA6-conditioned medium and found that it can induce DA neuronal differentiation in both the NTera2 cell line and the hESC line, I6. To identify the factor(s) responsible for SDIA, we used large-scale microarray analysis of gene expression combined with proteomic analysis of PA6-conditioned medium. Four candidate factors (hepatocyte growth factor (HGF), stromal cell-derived factor-1 alpha (SDF1alpha), secreted frizzled-related protein 1 (sFRP1) and vascular endothelial growth factor D (VEGFD)) were identified and immunoaffinity capillary electrophoresis (ICE) was used to establish the protein concentration of these factors in conditioned medium. Upon addition of SDF1alpha, sFRP1, and VEGFD, we observed an increase in the number of tyrosine hydroxylase- and TuJ1- positive cells in both the NTera2 and I6 cell lines. These results indicate that SDF1alpha, sFRP1 and VEGF-D are major components of SDIA, and suggest the potential use of these defined factors to elicit dopaminergic differentiation of pluripotent stem cells as a therapeutic intervention in PD. Mouse embryonic fibroblasts were grown in DMEM medium supplemented with 10% FBS; this conditioned media was used as the control. PA6, mouse stromal cells, were grown in MEM-alpha supplemented with 10% FBS; this conditioned media is known to induce differentiation in hES cells.

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Gene Expression Profiling of Human Embryonic Neural Stem Cells and Dopaminergic Neurons from Adult Human Substantia Nigra

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