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Journal of Neuroscience, Vol 15, 3039-3052, Copyright © 1995 by Society for Neuroscience
Maturation-dependent upregulation of growth-promoting molecules in developing cortical plate controls thalamic and cortical neurite growth
R Tuttle, BL Schlaggar, JE Braisted and DD O'Leary
Molecular Neurobiology Laboratory, Salk Institute, La Jolla, California 92037, USA.
We have tested the hypothesis that maturation-dependent changes in the
cortical plate affect the spatiotemporal growth patterns of developing
thalamocortical and corticocortical axonal projections. Given a choice
between alternating lanes of embryonic (E18-19) and neonatal (P0-1) rat
cortical plate membranes, embryonic (E18-19) thalamic and cortical neurites
prefer to extend on neonatal membranes. Thalamic and cortical explants do
extend neurites on uniform carpets of E19 cortical plate membranes, but the
outgrowth is consistently greater on uniform carpets of P1 cortical plate
membranes. These experiments demonstrate a maturation-dependent enhancement
in the ability of cortical plate to support neurite growth from thalamic
and cortical explants. In contrast, retinal and cerebellar neurites, which
do not grow into cortex in vivo, generally grew poorly on these membranes,
suggesting a degree of specificity to the neurite growth response.
Immunohistochemical analysis of developing cortex suggests that several
extracellular matrix (ECM) and cell adhesion molecules are upregulated in
cortical plate. However, immunocharacterization of membrane carpets for
these same ECM and cell adhesion molecules suggests that the growth
preferences of thalamic and cortical neurites in vitro are predominantly
influenced by membrane-anchored, rather than ECM, molecules. Western
analysis of E19 and P1 cortical plate membranes supports this conclusion,
and indicates that the membrane-anchored cell adhesion molecules L1 and
N-CAM are more abundant in the P1 cortical plate membrane preparation.
Experiments in which cortical plate membranes were treated to remove
molecules sensitive to phosphatidylinositol (PI)-specific phospholipase C
demonstrate that neurite growth promoters present in E19 cortical plate
membranes are predominantly PI linked, whereas those present in P1
membranes are predominantly non-PI linked. These findings indicate that the
neurite growth preferences are mediated, at least in part, by an
upregulation of neurite growth-promoting molecules in developing cortical
plate that are not PI linked. Taken together, these findings suggest that a
maturation-dependent upregulation of neurite growth-promoting molecules on
cortical plate cells controls the invasion of the cortical plate by
thalamocortical and corticocortical axons.
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