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Retinotectal projection system. Shin TAKAGI 1 , Hajime FUJISAWA 1 1Department of Anatomy, Kyoto Prefectural University of Medicine pp.309-319
Published Date 1987/4/10
DOI https://doi.org/10.11477/mf.1431905886

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  • Abstract
  • Look Inside

How neurons recognize and connect to their appropriate targets is a very important biological problem. In this connection, the retino-tectal system of the lower vertebrates has been one of the most extensively studied systems. Sperry revealed the existence of the specificity when the regenerating optic nerve fibers make connection to the tectal neurons, and proposed the famous chemoaffinity theory.

Recently developed immunological techniques including the production of the monoclonal anti-bodies (MAbs) enables us to examine directly the existence of the cell surface labels that the chemoaffinity theory assumed to explain the for-mation of the specific neuronal connections. We immunized the mice with the optic tectum of the Xenopus laevis and obtained a MAb (MAb A5) that bound selectively to the optic nerve termination sites in the visual centers. The spatial as well as temporal pattern of the ex-pression of the MAb A5 antigen suggested that this molecules might be involved in the target recognition of the optic nerve fibers. Meanwhile, the attempts to alter the topogra-phically ordered pattern of this projection system by using antibodies against N-CAM were reported recently. Several interesting antigens that might be involved in the formation of retino-tectal pro-jection were also reported. These works are briefly reviewed in this article.


Copyright © 1987, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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