6 Embryonic Stem Cells
Mostrando 13-24 de 134 artigos, teses e dissertações.
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13. mTOR Is Essential for Growth and Proliferation in Early Mouse Embryos and Embryonic Stem Cells
TOR is a serine-threonine kinase that was originally identified as a target of rapamycin in Saccharomyces cerevisiae and then found to be highly conserved among eukaryotes. In Drosophila melanogaster, inactivation of TOR or its substrate, S6 kinase, results in reduced cell size and embryonic lethality, indicating a critical role for the TOR pathway in cell g
American Society for Microbiology.
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14. Differentiation of embryonic stem cells is induced by GATA factors
Extraembryonic endoderm (ExE) is differentiated from the inner cell mass of the late blastocyst-stage embryo to form visceral and parietal endoderm, both of which have an important role in early embryogenesis. The essential roles of Gata-6 and Gata-4 on differentiation of visceral endoderm have been identified by analyses of knockout mice. Here we report tha
Cold Spring Harbor Laboratory Press.
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15. Ku70-deficient embryonic stem cells have increased ionizing radiosensitivity, defective DNA end-binding activity, and inability to support V(D)J recombination
V(D)J recombination requires both lymphoid-specific and generally expressed enzymatic activities. All three known generally expressed activities involved in V(D)J recombination are also involved in DNA double-strand break repair (DSBR). Two of these are components of the DNA-dependent protein kinase (DNA-PK) and include Ku80 and DNA-PK catalytic subunit (DNA
The National Academy of Sciences of the USA.
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16. Generation of dopaminergic neurons and pigmented epithelia from primate ES cells by stromal cell-derived inducing activity
We previously identified a stromal cell-derived inducing activity (SDIA), which induces differentiation of neural cells, including midbrain tyrosine hydroxylase-positive (TH+) dopaminergic neurons, from mouse embryonic stem cells. We report here that SDIA induces efficient neural differentiation also in primate embryonic stem cells. Induced neurons contain T
The National Academy of Sciences.
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17. Functional and biochemical association of Hck with the LIF/IL-6 receptor signal transducing subunit gp130 in embryonic stem cells.
The role played by the Src-related tyrosine kinase, Hck, in embryonic stem (ES) cell differentiation was investigated by replacing a conserved C-terminally located tyrosine with phenylalanine by gene targeting. Targeted ES cells display a 7- to 9-fold elevation in constitutive Hck kinase activity and require approximately 15 times less leukaemia inhibitory f
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18. Laminin α1 globular domains 4–5 induce fetal development but are not vital for embryonic basement membrane assembly
During early mouse embryogenesis, each laminin (Lm) chain of the first described Lm, a heterotrimer of α1, β1, and γ1 chains (Lm-1), is essential for basement membrane (BM) assembly, which is required for pregastrulation development. Individual domains may have other functions, not necessarily structural. The cell binding C terminus of Lm α1 chain contai
National Academy of Sciences.
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19. Developmentally regulated use of alternative promoters creates a novel platelet-derived growth factor receptor transcript in mouse teratocarcinoma and embryonic stem cells.
Embryonal carcinoma and embryonic stem cells expressed a novel form of platelet-derived growth factor receptor mRNA which was approximately 1,100 base pairs shorter than the 5.3-kilobase (kb) transcript expressed in fibroblasts and other cell types. The 4.2-kb stem cell transcript was initiated within the genomic region immediately upstream of exon 6 of the
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20. Stable Isotope Labeling by Amino Acids in Cell Culture (SILAC) and Quantitative Comparison of the Membrane Proteomes of Self-renewing and Differentiating Human Embryonic Stem Cells*S⃞
Stable isotope labeling by amino acids in cell culture (SILAC) is a powerful quantitative proteomics platform for comprehensive characterization of complex biological systems. However, the potential of SILAC-based approaches has not been fully utilized in human embryonic stem cell (hESC) research mainly because of the complex nature of hESC culture condition
American Society for Biochemistry and Molecular Biology.
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21. The role of nucleotide excision repair in protecting embryonic stem cells from genotoxic effects of UV-induced DNA damage.
In this study the role of nucleotide excision repair (NER) in protecting mouse embryonic stem (ES) cells against the genotoxic effects of UV-photolesions was analysed. Repair of cyclobutane pyrimidine dimers (CPD) in transcribed genes could not be detected whereas the removal of (6-4) photoproducts (6-4PP) was incomplete, already reaching its maximum (30%) 4
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22. Severe Global DNA Hypomethylation Blocks Differentiation and Induces Histone Hyperacetylation in Embryonic Stem Cells
It has been reported that DNA methyltransferase 1-deficient (Dnmt1−/−) embryonic stem (ES) cells are hypomethylated (20% CpG methylation) and die through apoptosis when induced to differentiate. Here, we show that Dnmt[3a−/−,3b−/−] ES cells with just 0.6% of their CpG dinucleotides behave differently: the majority of cells within the culture are
American Society for Microbiology.
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23. Identification and characterization of hematopoietic stem cells from the yolk sac of the early mouse embryo.
The yolk sac is the first site of hematopoiesis in the mammalian embryo. However, little is known about the initial stem cells in the yolk sac. We have isolated hematopoietic stem cells from early mouse embryonic yolk sac by using a sequential protocol of nonadherence to plastic, density gradient centrifugation, immunocytoadherence, and cell sorting. Isolate
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24. Long-term reconstitution of the mouse hematopoietic system by embryonic stem cell-derived fetal liver.
Murine embryonic stem (ES) cells are permanent blastocyst-derived cell lines capable of contributing to a wide variety of tissues, including the germ line, after injection into host blastocysts. Recently, we have shown that ES cells can produce all of the cells of the developing fetus after aggregation with developmentally compromised tetraploid embryos. Com