Fibroblast Growth Factor-2 Activates a Latent Neurogenic Program in Neural Stem Cells from Diverse Regions of the Adult CNS

By T. Palmer, E. Markakis, Andrew R. Willhoite, Frank Safar, Fred H. Gage. 1999

During development of the mammalian brain, both neurons and glia are generated from multipotent neural stem cells. Although neurogenesis ceases in most areas at birth, stem cells continue to generate neurons within the subventricular zone and hippocampal dentate gyrus throughout adult life. In this work, we provide the first demonstration that precursors native to regions of the adult brain that generate only glia can also generate neurons after exposure to FGF-2 in vitro. When progenitors isolated from hippocampal tissue were directly compared with cells isolated from the neocortex, both populations were able to initiate a program of proliferative neurogenesis. Genetic marking and lineage analysis showed that a majority of the cells able to generate neurons were multipotent precursors; however, progeny from these precursors acquired the competence to differentiate into neurons only after exposure to FGF-2. The recruitment of similar FGF-2-responsive cells from the adult optic nerve, a structure well isolated from the neurogenic zones within the brain, confirmed that neuron-competent precursors naturally exist in widely divergent tissues of the adult brain.

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Citations in the corpus

Adult Neurogenesis in the Mammalian Brain: Significant Answers and Significant Questions (2011, background): “Notably, proliferating neural precursors are present in other CNS regions where they give rise to oligodendrocytes and astrocytes (Barnabé -Heider et al., 2010; Lie et al., 2002; Palmer et al., 1999).”
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