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The Journal of Neuroscience, December 15, 2000, 20(24):9145-9151

Inhibitory Mechanism by Polysialic Acid for Lamina-Specific Branch Formation of Thalamocortical Axons

Nobuhiko Yamamoto¹, Kayo Inui¹, Yuki Matsuyama¹, Akiko Harada¹, Kenji Hanamura¹, Fujio Murakami¹, Edward S. Ruthazer¹, Urs Rutishauser², and Tatsunori Seki³

¹ Division of Biophysical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan, ² Program in Cellular Biochemistry and Biophysics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, and ³ Department of Anatomy, Juntendo University, School of Medicine, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan

During development, thalamocortical axons form arbors primarily in layer 4 of the neocortex. This lamina-specific branch formation was studied in cultures of rat thalamic explants grown next to chemically fixed cortical slices. After a week in vitro, thalamic axons formed branches specifically in the target layer of fixed cortical slices, regardless of the orientation of the ingrowth. This in vitro system permits a direct assessment of contributions of membrane-associated molecules to thalamic axon branch formation. To this end, the present study uses three enzymatic perturbations: chondroitinase, phosphatidylinositol phospholipase C, or the polysialic acid (PSA)-specific endoneuraminidase (endo N). With endo N pretreatment of cortex, the number of branch points was increased significantly, whereas branch tip length was decreased. In addition, the localization of branch points to the target layer was weakened considerably. These features of branch formation were not altered by the other two enzymatic treatments, except that branch tips were shortened by chondroitinase treatment to the same extent as in endo N treatment. These results suggest that membrane-bound components are involved in lamina-specific branch formation of thalamocortical axons, and in particular that PSA moieties contribute to laminar specificity by inhibiting branch emergence in inappropriate layers.

Key words: thalamocortical projection; axonal branch; layer specificity; cortical development; target recognition; axon guidance; thalamus

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Copyright © 2000 Society for Neuroscience  0270-6474/00/20249145-07$05.00/0

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