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Neural stem cells redefined

A FACS perspective

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Abstract

Using the generally accepted ontogenetic definition, neural stem cells (NSCs) are characterized as undifferentiated cells originating from the neuroectoderm that have the capacity both to perpetually self-renew without differentiating and to generate multiple types of lineage-restricted progenitors (LRP). LRPs can themselves undergo limited self-renewal, then ultimately differentiate into highly specialized cells that compose the nervous system. However, this physiologically delimited definition of NSCs has been increasingly blurred in the current state of the field, as the great majority of studies have retrospectively inferred the existence of NSCs based on their deferred functional capability rather than prospectively identifying the actual cells that created the outcome. Further complicating the matter is the use of a wide variety of neuroepithelial or neurosphere preparations as a source of putative NSCs, without due consideration that these preparations are themselves composed of heterogeneous populations of both NSCs and LRPs. This article focuses on recent attempts using FACS strategies to prospectively isolate NSCs from different types of LRPs as they appear in vivo and reveals the contrasting differences among these populations at molecular, phenotypic, and functional levels. Thus, the strategies presented here provide a framework for more precise studies of NSC and LRP cell biology in the future.

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  1. Laboratory of Neurophysiology, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 20892, Bethesda, MD

    Dragan Maric & Jeffery L. Barker

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Maric, D., Barker, J.L. Neural stem cells redefined. Mol Neurobiol 30, 49–76 (2004). https://doi.org/10.1385/MN:30:1:049

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