FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE
The leading tips of elongating nerve fibers are enlarged into "growth cones" which are seen in tissue culture to continually undergo changes in conformation and to foster numerous transitory slender extensions (filopodia) and/or a veillike ruffling sheet. After explantation of 1-day-old ra...
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1973
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108939/ https://www.ncbi.nlm.nih.gov/pubmed/4347207 |
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author | Bunge, Mary Bartlett |
author_facet | Bunge, Mary Bartlett |
author_sort | Bunge, Mary Bartlett |
collection | PubMed |
description | The leading tips of elongating nerve fibers are enlarged into "growth cones" which are seen in tissue culture to continually undergo changes in conformation and to foster numerous transitory slender extensions (filopodia) and/or a veillike ruffling sheet. After explantation of 1-day-old rat superior cervical ganglia (as pieces or as individual neurons), nerve fibers and tips were photographed during growth and through the initial stages of aldehyde fixation and then relocated after embedding in plastic. Electron microscopy of serially sectioned tips revealed the following. The moving parts of the cone, the peripheral flange and filopodia, contained a distinctive apparently filamentous feltwork from which all organelles except membranous structures were excluded; microtubules were notably absent from these areas. The cone interior contained varied forms of agranular endoplasmic reticulum, vacuoles, vesicles, coated vesicles, mitochondria, microtubules, and occasional neurofilaments and polysomes. Dense-cored vesicles and lysosomal structures were also present and appeared to be formed locally, at least in part from reticulum. The possible roles of the various forms of agranular membranous components are discussed and it is suggested that structures involved in both the assembly and degradation of membrane are present in the cone. The content of these growing tips resembles that in sensory neuron growth cones studied by others. |
format | Text |
id | pubmed-2108939 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1973 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21089392008-05-01 FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE Bunge, Mary Bartlett J Cell Biol Article The leading tips of elongating nerve fibers are enlarged into "growth cones" which are seen in tissue culture to continually undergo changes in conformation and to foster numerous transitory slender extensions (filopodia) and/or a veillike ruffling sheet. After explantation of 1-day-old rat superior cervical ganglia (as pieces or as individual neurons), nerve fibers and tips were photographed during growth and through the initial stages of aldehyde fixation and then relocated after embedding in plastic. Electron microscopy of serially sectioned tips revealed the following. The moving parts of the cone, the peripheral flange and filopodia, contained a distinctive apparently filamentous feltwork from which all organelles except membranous structures were excluded; microtubules were notably absent from these areas. The cone interior contained varied forms of agranular endoplasmic reticulum, vacuoles, vesicles, coated vesicles, mitochondria, microtubules, and occasional neurofilaments and polysomes. Dense-cored vesicles and lysosomal structures were also present and appeared to be formed locally, at least in part from reticulum. The possible roles of the various forms of agranular membranous components are discussed and it is suggested that structures involved in both the assembly and degradation of membrane are present in the cone. The content of these growing tips resembles that in sensory neuron growth cones studied by others. The Rockefeller University Press 1973-03-01 /pmc/articles/PMC2108939/ /pubmed/4347207 Text en Copyright © 1973 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
spellingShingle | Article Bunge, Mary Bartlett FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title | FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title_full | FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title_fullStr | FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title_full_unstemmed | FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title_short | FINE STRUCTURE OF NERVE FIBERS AND GROWTH CONES OF ISOLATED SYMPATHETIC NEURONS IN CULTURE |
title_sort | fine structure of nerve fibers and growth cones of isolated sympathetic neurons in culture |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108939/ https://www.ncbi.nlm.nih.gov/pubmed/4347207 |
work_keys_str_mv | AT bungemarybartlett finestructureofnervefibersandgrowthconesofisolatedsympatheticneuronsinculture |