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The Journal of Neuroscience, July 1, 2000, 20(13):5012-5023

Basic Fibroblast Growth Factor (Fgf2) Is Necessary for Cell Proliferation and Neurogenesis in the Developing Cerebral Cortex

Rossana Raballo1, Julianne Rhee1, Richard Lyn-Cook1, James F. Leckman1, Michael L. Schwartz2, and Flora M. Vaccarino1, 2

1 Child Study Center and 2 Section of Neurobiology, Yale University, New Haven, Connecticut 06520

Little is known about regionally specific signals that control the number of neuronal progenitor cells in vivo. We have previously shown that the germline mutation of the basic fibroblast growth factor (Fgf2) gene results in a reduction in the number of cortical neurons in the adult. We show here that Fgf2 is expressed in the pseudostratified ventricular epithelium (PVE) in a dorsoventral gradient and that Fgf2 and its receptor, Fgfr-1, are downregulated by mid to late stages of neurogenesis. In Fgf2 knockout mice, the volume and cell number of the dorsal PVE (the cerebral cortical anlage) are substantially smaller, whereas the volume of the basal PVE is unchanged. The dorsal PVE of Fgf2 knockout mice has a 50% decrease in founder cells and a reduced expansion of the progenitor pool over the first portion of neurogenesis. Despite this reduction, the degree of apoptosis within the PVE is not changed in the Fgf2 knockouts. Cortical neuron number was decreased by 45% in Fgf2 knockout mice by the end of neurogenesis, whereas the number of neurons in the basal ganglia was unaffected. Microscopically, the frontal cerebral cortex of neonatal Fgf2 null mutant mice lacked large neurons in deep cortical layers. We suggest that Fgf2 is required for the generation of a specific class of cortical neurons arising from the dorsal PVE.

Key words: fibroblast growth factor; Fgf2; knockout; null mutation; gene; neurogenesis; mouse; pseudostratified ventricular epithelium; apoptosis; cell division; neuronal progenitor; cerebral cortex; basal ganglia


Copyright © 2000 Society for Neuroscience  0270-6474/00/20135012-12$05.00/0


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