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• W2043686906 abstract "Human midbrain-derived neural progenitor cells (NPCs) may serve as a continuous source of dopaminergic neurons for the development of novel regenerative therapies in Parkinson’s disease. However, the molecular and functional characteristics of glutamate receptors in human NPCs are largely unknown. Here, we show that differentiated human mesencepahlic NPCs display a distinct pattern of glutamate receptors. In whole-cell patch-clamp recordings, l-glutamate and NMDA elicited currents in 93% of NPCs after 3 weeks of differentiation in vitro. The concentration-response plots of differentiated NPCs yielded an EC50 of 2.2 μM for glutamate and an EC50 of 36 μM for NMDA. Glutamate-induced currents were markedly inhibited by memantine in contrast to 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) suggesting a higher density of functional NMDA than alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA)/kainate receptors. NMDA-evoked currents and calcium signals were blocked by the NR2B-subunit specific antagonist ifenprodil indicating functional expression of NMDA receptors containing subunits NR1 and NR2B. In calcium imaging experiments, the blockade of voltage-gated calcium channels by verapamil abolished AMPA-induced calcium responses but only partially reduced NMDA-evoked transients suggesting the expression of calcium-impermeable, GluR2-containing AMPA receptors. Quantitative real-time PCR showed a predominant expression of subunits NR2A and NR2B (NMDA), GluR2 (AMPA), GluR7 (kainate), and mGluR3 (metabotropic glutamate receptor). Treatment of NPCs with 100 μM NMDA in vitro during proliferation (2 weeks) and differentiation (1 week) increased the amount of tyrosine hydroxylase-immunopositive cells significantly, which was reversed by addition of memantine. These data suggest that NMDA receptors in differentiating human mesencephalic NPCs are important regulators of dopaminergic neurogenesis in vitro." @default.
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• W2043686906 date "2009-10-01" @default.
• W2043686906 modified "2023-10-12" @default.
• W2043686906 title "Glutamate receptor properties of human mesencephalic neural progenitor cells: NMDA enhances dopaminergic neurogenesis<i>in vitro</i>" @default.
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• W2043686906 doi "https://doi.org/10.1111/j.1471-4159.2009.06315.x" @default.
• W2043686906 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19659571" @default.
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