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• W2013852351 abstract "We tested whether dopaminergic drugs can improve the protocol for in vitro differentiation of H9 human embryonic stem cells (hESCs) into dopaminergic neurons. The expression of 5 dopamine (DA) receptor subtypes (mRNA and protein) was analyzed at each protocol stage (1, undifferentiated hESCs; 2, embryoid bodies [EBs]; 3, neuroepithelial rosettes; 4, expanding neuroepithelium; and 5, differentiating neurons) and compared to human fetal brain (gestational week 17-19). D2-like DA receptors (D2, D3, and D4) predominate over the D1-like receptors (D1 and D5) during derivation of neurons from hESCs. D1 was the receptor subtype with the lowest representation in each protocol stage (Stages 1-5). D1/D5-agonist SKF38393 and D2/D3/D4-agonist quinpirole (either alone or combined) evoked Ca(2+) responses, indicating functional receptors in hESCs. To identify when receptor activation causes a striking effect on hESC neurodifferentiation, and what ligands and endpoints are most interesting, we varied the timing, duration, and drug in the culture media. Dopaminergic agonists or antagonists were administered either early (Stages 1-3) or late (Stages 4-5). Early DA exposure resulted in more neuroepithelial colonies, more neuronal clusters, and more TH(+) clusters. The D1/D5 antagonist SKF83566 had a strong effect on EB morphology and the expression of midbrain markers. Late exposure to DA resulted in a modest increase in TH(+) neuron clusters (∼75%). The increase caused by DA did not occur in the presence of dibutyryl cAMP (dbcAMP), suggesting that DA acts through the cAMP pathway. However, a D2-antagonist (L741) decreased TH(+) cluster counts. Electrophysiological parameters of the postmitotic neurons were not significantly affected by late DA treatment (Stages 4-5). The mRNA of mature neurons (VGLUT1 and GAD1) and the midbrain markers (GIRK2, LMX1A, and MSX1) were lower in hESCs treated by DA or a D2-antagonist. When hESCs were neurodifferentiated on PA6 stromal cells, DA also increased expression of tyrosine hydroxylase. Although these results are consistent with DA's role in potentiating DA neurodifferentiation, dopaminergic treatments are generally less efficient than dbcAMP alone." @default.
• W2013852351 created "2016-06-24" @default.
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• W2013852351 date "2013-05-15" @default.
• W2013852351 modified "2023-10-16" @default.
• W2013852351 title "Dopamine Receptors in Human Embryonic Stem Cell Neurodifferentiation" @default.
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• W2013852351 doi "https://doi.org/10.1089/scd.2012.0150" @default.
• W2013852351 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3653401" @default.
• W2013852351 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23286225" @default.
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