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Development, Vol 112, Issue 2 581-590, Copyright © 1991 by Company of Biologists

JOURNAL ARTICLES

Rodent CNS neuroblasts exhibit both perpendicular and parallel contact guidance on the aligned parallel neurite bundle

I Nagata and N Nakatsuji
Department of Genetics, Tokyo Metropolitan Institute for Neurosciences, Japan.

Mouse cerebellar granule cells showed two types of migration behavior in microexplant cultures. They first migrated along their neurites, showing the typical contact guidance, and then oriented themselves at right angles to the parallel neurites, thus exhibiting the 'perpendicular contact guidance' (Nakatsuji, N. and Nagata, I. 1989 Development, 106, 441-447). To study whether other neurons have the capacity to show similar 'perpendicular contact guidance', we cultured dissociated neuroblasts from various parts of CNS or PNS on parallel neurite bundles. The PNS neuroblasts always extended their processes parallel to the neurite bundle. In contrast, almost all kinds of CNS neuroblasts tested oriented their processes both perpendicular and parallel to the neurite bundles that were all free of glia. Time-lapse video recording revealed that neuroblasts migrated in both directions. Thus, CNS neuroblasts possess the capacity to migrate and extend their processes at right angles to the substratum of heterotypic neurite bundles, which may play an important role in histogenesis of the CNS during development.
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© The Company of Biologists Ltd 1991