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The Journal of Neuroscience, May 15, 1998, 18(10):3620-3629
Multiple Routes to Astrocytic Differentiation in the CNS
Prithi Rajan and Ronald D. G. McKay Laboratory of Molecular Biology, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892-4157
Ciliary neurotrophic factor (CNTF) acts instructively to switch multipotent stem cells of the CNS to an astrocytic fate. Here we show that CNTF causes activation of janus kinase-signal transducers and activators of transcription and mitogen-activated protein kinase (MAPK) pathways with differential kinetics in these cells. Inhibition studies indicate that activation of the MAPK pathway is required early in the differentiation process, whereas activation of signal transducer and activator of transcription (STAT) proteins is required for commitment to an astrocytic fate. Bone morphogenetic proteins have also been shown to cause astrocytic differentiation but do not cause STAT activation or astrocytic differentiation in fibroblast growth factor 2-expanded fetal stem cells used here. These results show that there are two distinct routes to initiate astrocytic commitment in multipotent CNS precursors.
Key words: astrocytic differentiation; CNS stem cells; mammalian CNS development; intracellular signaling; CNTF; BMP4; EGF
Copyright © 1998 Society for Neuroscience 0270-6474/98/18103620-10$05.00/0
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