Abstract
An understanding of how mammalian stem cells produce specific neuronal subtypes remains elusive. Here we show that human embryonic stem cells generated early neuroectodermal cells, which organized into rosettes and expressed Pax6 but not Sox1, and then late neuroectodermal cells, which formed neural tube–like structures and expressed both Pax6 and Sox1. Only the early, but not the late, neuroectodermal cells were efficiently posteriorized by retinoic acid and, in the presence of sonic hedgehog, differentiated into spinal motoneurons. The in vitro–generated motoneurons expressed HB9, HoxC8, choline acetyltransferase and vesicular acetylcholine transporter, induced clustering of acetylcholine receptors in myotubes, and were electrophysiologically active. These findings indicate that retinoic acid action is required during neuroectoderm induction for motoneuron specification and suggest that stem cells have restricted capacity to generate region-specific projection neurons even at an early developmental stage.
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Acknowledgements
This study was supported by the Amyotrophic Lateral Sclerosis Association, Hope for ALS, National Institutes of Health (National Institute of Neurological Disorders and Stroke, R01-NS045926), and partly by a core grant to the Waisman Center from the National Institute of Child Health and Human Development (P30 HD03352). We thank M. Nakafuku, S. Pfaff and F. Vaccarino for generously providing antibodies against Olig2, Islet1/2 and Otx2, E. Terasawa for providing the embryonic monkey tissues and C.N. Svendsen and A. Bhattacharyya for reading the manuscript.
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Supplementary information
Supplementary Fig. 1
Expression of Pax6 and Sox1 mRNA by neuroectodermal cells. (PDF 44 kb)
Supplementary Fig. 2
Expression of Pax7 by neuroectodermal cells. (PDF 52 kb)
Supplementary Fig. 3
Expression of ChAT protein by motoneurons. (PDF 53 kb)
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Li, XJ., Du, ZW., Zarnowska, E. et al. Specification of motoneurons from human embryonic stem cells. Nat Biotechnol 23, 215–221 (2005). https://doi.org/10.1038/nbt1063
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DOI: https://doi.org/10.1038/nbt1063
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