Astrocyte-derived factors instruct differentiation of embryonic stem cells into neurons

Neuroscience Research
Takashi NakayamaNobuo Inoue

Abstract

Pluripotent embryonic stem (ES) cells may differentiate into neurons in vitro. This is valuable in the study of neurogenesis and in the generation of donor cells for neuronal transplantation. Here we show that astrocyte-derived factors instruct mouse and primate ES cells to differentiate into neurons. Cultured in astrocyte-conditioned medium (ACM) under free-floating conditions, within 4 days, colonies of undifferentiated mouse ES cells give rise to floating spheres of concentric stratiform structure with a periphery of neural stem cells, which are termed Neural Stem Spheres. Culturing the spheres on an adhesive substrate in ACM promotes neurogenesis, and cells in the spheres differentiate into neurons within 5 days, including dopaminergic neurons. In contrast, neither astrocytes nor oligodendrocytes are formed. The procedure developed for mouse ES cells can be applied to monkey ES cells. This neurogenesis pathway provides a new insight into mechanisms of specification of cell fates in early development and also provides a simple procedure for fast and efficient generation of a vast number of neural stem cells and neurons.

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