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The Journal of Neuroscience, February 1, 2003, 23(3):883

Fibroblast Growth Factor Receptor 3 Signaling Regulates the Onset of Oligodendrocyte Terminal Differentiation

Luke Y. S. Oh¹, Adam Denninger¹, Jennifer S. Colvin³, Aditee Vyas², Shubha Tole², David M. Ornitz³, and Rashmi Bansal¹

¹ Department of Neuroscience, University of Connecticut Medical School, Farmington, Connecticut 06030, ² Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, 400 005 India, and ³ Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri 63110

Fibroblast growth factor receptor (FGFR) signaling is essential for nervous system development. We have shown that, in the normal postnatal brain, the spatial and temporal expression pattern of FGFR3 parallels the appearance of differentiated oligodendrocytes and that in culture FGFR3 is expressed maximally at the critical stage in the lineage at which oligodendrocyte late progenitors (Pro-OLs) enter terminal differentiation. Therefore, FGFR3 expression is positioned ideally to have an impact on oligodendrocyte differentiation. In support of this we show that, during the onset and active phase of myelination in FGFR3-deficient mice, there are reduced numbers of differentiated oligodendrocytes in the forebrain, cerebellum, hindbrain, and spinal cord. Furthermore, myelination is delayed in parallel. Delay of oligodendrocyte differentiation also is observed in primary cell culture from this mutant. On the other hand, no differences are observed in the survival or proliferation of oligodendrocyte progenitors. This suggests that the decrease in the number of differentiated oligodendrocytes is attributable to a delay in the timing of their differentiation process. Astrocytes also express FGFR3, and in mice lacking FGFR3 there is an enhancement of the astrocytic marker glial fibrillary acidic protein expression in a region-specific manner. Thus our findings suggest that there are cell type- and region-specific functions for FGFR3 signaling and in particular emphasize a prominent role for FGFR3 as part of a system regulating the onset of oligodendrocyte terminal differentiation.

Key words: oligodendrocyte; myelin; FGF; astrocyte; cerebellar neuron; FGF receptor

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Copyright © 2003 Society for Neuroscience  0270-6474/03/233883-12$05.00/0

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