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Retinal neural progenitors express topographic map markers

机译:视网膜神经祖细胞表达地形图标记

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Transplantation of neural stem cells for replacing neurons after neurodegeneration requires that the transplanted stem cells accurately reestablish the lost neural circuits in order to restore function. Retinal ganglion cell axons project to visual centers of the brain forming circuits in precise topographic order. In chick, dorsal retinal neurons project to ventral optic tectum, ventral neurons to dorsal tectum, anterior neurons to posterior tectum and posterior neurons to anterior tectum; forming a continuous point-to-point map of retinal cell position in the tectal projection. We found that when stem cells derived from ventral retina were implanted in dorsal host retina, the stem cells that became ganglion cells projected to dorsal tectum, appropriate for their site of origin in retina but not appropriate for their site of implant in retina. This led us to ask if retinal progenitors exhibit topographic markers of cell position in retina. Indeed, retinal neural progenitors express topographic markers: dorsal stem cells expressed more Ephrin B2 than ventral stem cells and, conversely, ventral stem cells expressed more Pax-2 and Ventroptin than dorsal stem cells. The fact that neural progenitors express topographic markers has pertinent implications in using neural stem cells in cell replacement therapy for replacing projecting neurons that express topographic order, e.g.; analogous neurons of the visual, auditory, somatosensory and motor systems.
机译:神经干细胞移植以替代神经变性后的神经元需要移植的干细胞准确地重建失去的神经回路,以恢复功能。视网膜神经节细胞轴突以精确的地形顺序投影到大脑形成回路的视觉中心。在雏鸡中,背侧视网膜神经元突出到腹侧视神经额,腹侧神经元突出到背侧额骨,前神经元突出到后额骨,后神经元突出到前额耳;形成在顶盖投影中视网膜细胞位置的连续点对点图。我们发现,当将源自腹侧视网膜的干细胞植入到背侧宿主视网膜中时,成为神经节细胞的干细胞会投射到背盖,适合于它们在视网膜中的起源位置,而不适合于它们在视网膜中的植入位置。这导致我们问视网膜祖细胞是否在视网膜中表现出细胞位置的地形标志。的确,视网膜神经祖细胞表达了地形标记:背侧干细胞表达的Ephrin B2比腹侧干细胞多,相反,腹侧干细胞比背侧干细胞表达更多的Pax-2和Ventroptin。神经祖细胞表达地形标记的事实对于在细胞替代疗法中使用神经干细胞替代表达地形顺序的投射神经元具有重要意义。视觉,听觉,体感和运动系统的类似神经元。

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