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Journal of Neuroscience, Vol 15, 3716-3729, Copyright © 1995 by Society for Neuroscience
Retinal axon divergence in the optic chiasm: uncrossed axons diverge from crossed axons within a midline glial specialization
RC Marcus, R Blazeski, P Godement and CA Mason
Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
A long-standing question is how fiber pathways in the mammalian CNS project
to both sides of the brain. Static and real-time analyses of dye-labeled
retinal axons (Godement et al., 1990, 1994) have demonstrated that at
embryonic day 15-17 in the mouse, crossed and uncrossed axons from each eye
diverge in a zone 100-200 microns proximal to the midline of the optic
chiasm. In this study, we identify cellular specializations in this zone
that might serve as cues for retinal axon divergence. Second, using growth
cone morphology as an indicator of growth cone destination, we analyzed how
crossed and uncrossed retinal growth cones related to these cellular
components. Monoclonal antibody RC2, a marker for radial glia in embryonic
mouse CNS, revealed a palisade of radial glia straddling the midline. At
the midline, a thin raphe of cells that appear morphologically distinct
from the radial glia express a free carbohydrate epitope, stage- specific
embryonic antigen 1 (SSEA-1). Sections containing Dil-labeled axons and
immunolabeled cells indicated that all axons enter the radial glial
palisade. Uncrossed axons turn within the palisade, but never beyond the
raphe of SSEA-1-positive cells. In addition, ultrastructural analysis
indicated that all growth cones contact radial glia, with projections of
the growth cone interdigitating with glial fibers. These results
demonstrate that retinal axons diverge within a cellular specialization
centered around the midline of the developing optic chiasm, consistent with
the hypothesis that cues for divergence are located in this zone.
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