BDNF-modulated spatial organization of Cajal-Retzius and GABAergic neurons in the marginal zone plays a role in the development of cortical organization.
Journal - Cerebral cortex (New York, N.Y. : 1991) (United States )
The present study utilizes nestin-BDNF transgenic mice, which offer a model for early increased brain-derived neurotrophic factor (BDNF) signalling, to examine the role of BDNF in the development of cortical architecture. Our results demonstrate that the premature and homogeneous expression of BDNF, while preserving tangential migration from the ganglionic eminence to the cortex, impairs the final radial migration of GABAergic neurons, as well as their integration in the appropriate cortical layers. Moreover, Cajal-Retzius (CR) cells and GABAergic neurons segregate in the cortical marginal zone (MZ) in response to BDNF signalling, leading to an alternating pattern and a columnar cortical organization, within which the migration of different neuronal populations is specifically affected. These results suggest that both CR and GABAergic neurons play a role in directing the radial migration of late-generated cortical neurons, and that the spatial distribution of these cells in the MZ is critical for the development of correct cortical organization. In addition, reelin secreted by CR cells in the MZ is not sufficient to direct the migration of late-born neurons to the upper cortical layers, which most likely requires the presence of reelin-secreting interneurons in layers V-VI. We propose that in addition to modulating reelin expression, BDNF regulates the patched distribution of CR and GABAergic neurons in the MZ, and that this spatial distribution is involved in the formation of anatomical and/or functional columns and convoluted structures.
|ISSN : ||1047-3211|
|Mesh Heading : ||Animals Brain-Derived Neurotrophic Factor Cell Adhesion Molecules, Neuronal Cell Movement Cell Proliferation Cerebral Cortex Extracellular Matrix Proteins Intermediate Filament Proteins Interneurons Mice Mice, Transgenic Nerve Net Nerve Tissue Proteins Neuronal Plasticity Serine Endopeptidases gamma-Aminobutyric Acid genetics metabolism physiology cytology metabolism genetics metabolism cytology embryology physiology genetics metabolism metabolism|
|Mesh Heading Relevant : ||metabolism embryology physiology metabolism physiology metabolism|