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Journal of Neuroscience, Vol 12, 3525-3534, Copyright © 1992 by Society for Neuroscience
Restricted expression of N- and R-cadherin on neurites of the developing chicken CNS
C Redies, H Inuzuka and M Takeichi
Department of Biophysics, Faculty of Science, Kyoto University, Japan.
The expression of two cadherins, N- and R-cadherin, was mapped in the CNS
of chicken embryos of 6-11 d incubation, focusing on the sensory and motor
fiber systems. In the spinal cord, the laterally located fibers of the
dorsal funiculus express N-cadherin while the medially located fibers do
not. These two fiber systems have a different course within the CNS but
associate to form the spinal dorsal roots. In the hindbrain, N-cadherin is
expressed by the descending trigeminal (general somatic sensory) tract,
which is contiguous with the N- cadherin-positive zone of the dorsal
funiculus of the spinal cord. R- cadherin is not expressed by sensory
fibers, but is expressed by the visceral motor system of the vagus and
glossopharyngeal nerves, which are N-cadherin negative. The motor neurites
expressing R-cadherin have a different course within the brain than the
sensory neurites expressing N-cadherin, although they form the common
sensory/motor roots of the vagus nerve at the surface of the brain. The
possibility that N-cadherin provides a guidance cue for sensory axon
migration within the CNS by a homophilic adhesion mechanism was
investigated in vitro. Explants from sensory spinal ganglia expressing
N-cadherin were placed on N-cadherin-transfected neuroblastoma cells, and
axon outgrowth was visualized. Results showed that the sensory axons
defasciculate and closely follow the cell-cell boundaries between
transfected cells where high levels of N-cadherin are expressed. These
results show that the two cadherins, like members of the immunoglobulin
superfamily of molecules, are expressed in a topographically restricted
fashion during chick brain development. They furthermore suggest that N-
cadherin expression by neurites may play a role in guiding these neurites
along CNS paths that express the same molecule.
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