Basic fibroblast growth factor (Fgf2) is necessary for cell proliferation and neurogenesis in the developing cerebral...

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Regional signals controlling neuronal progenitor cell numbers in vivo are poorly understood.
• Previous work indicated basic fibroblast growth factor (Fgf2) mutations reduce adult cortical neuron counts.

Purpose of the Study:

• To investigate the role of Fgf2 in the development of neuronal progenitor cells and cortical neuron generation.
• To determine the expression patterns and function of Fgf2 in the developing brain.

Main Methods:

• Analysis of Fgf2 expression in the pseudostratified ventricular epithelium (PVE) using a dorsoventral gradient.
• Comparison of Fgf2 knockout mice with wild-type littermates, focusing on PVE volume, cell number, and progenitor pool expansion.
• Assessment of apoptosis and final cortical neuron numbers at the end of neurogenesis.

Main Results:

• Fgf2 is expressed in a dorsoventral gradient within the PVE and is downregulated during later neurogenesis.
• Fgf2 knockout mice exhibit smaller dorsal PVE volume and a 50% reduction in founder cells.
• Cortical neuron numbers decrease by 45% in Fgf2 knockout mice, with a notable absence of large neurons in deep cortical layers.

Conclusions:

• Fgf2 is essential for the expansion of the progenitor pool in the dorsal PVE.
• Fgf2 plays a critical role in generating a specific population of cortical neurons.
• The findings highlight Fgf2's requirement for proper cortical development and neuron production.