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Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase
To test the effects of isolation on adult neurons, we investigated the fine structure and synaptic activity of rod cells dissociated from the mature salamander retina and maintained in vitro. First, freshly isolated rod cells appeared remarkably similar to their counterparts in the intact retina: th...
Formato: | Texto |
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Lenguaje: | English |
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The Rockefeller University Press
1985
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2113495/ https://www.ncbi.nlm.nih.gov/pubmed/3965470 |
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collection | PubMed |
description | To test the effects of isolation on adult neurons, we investigated the fine structure and synaptic activity of rod cells dissociated from the mature salamander retina and maintained in vitro. First, freshly isolated rod cells appeared remarkably similar to their counterparts in the intact retina: the outer segment retained its stack of membranous disks and the inner segment contained its normal complements of organelles. Some reorganization of the cell surface, however, was observed: (a) radial fins, present at the level of the cell body, were lost; and (b) the apical and distal surfaces of the inner and outer segments, respectively became broadly fused. Second, the synaptic endings or pedicles retained their presynaptic active zones: reconstruction of serially sectioned pedicles by using three- dimensional computer graphics revealed that 73% of the synaptic ribbons remained attached to the plasmalemma either at the cell surface or along its invaginations. Finally, tracer experiments that used horseradish peroxidase demonstrated that dissociated rod cells recycled synaptic vesicle membrane in the dark and thus probably released transmitter by exocytosis. Under optimal conditions, a maximum of 40% of the synaptic vesicles within the pedicle were labeled. As in the intact retina, uptake of horseradish peroxidase was suppressed by light. Thus, freshly dissociated receptor neurons retained many of their adult morphological and physiological characteristics. In long- term culture, the photoreceptors tended to round up; however, active zones were present even 2 wk after removal of the postsynaptic processes. |
format | Text |
id | pubmed-2113495 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1985 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21134952008-05-01 Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase J Cell Biol Articles To test the effects of isolation on adult neurons, we investigated the fine structure and synaptic activity of rod cells dissociated from the mature salamander retina and maintained in vitro. First, freshly isolated rod cells appeared remarkably similar to their counterparts in the intact retina: the outer segment retained its stack of membranous disks and the inner segment contained its normal complements of organelles. Some reorganization of the cell surface, however, was observed: (a) radial fins, present at the level of the cell body, were lost; and (b) the apical and distal surfaces of the inner and outer segments, respectively became broadly fused. Second, the synaptic endings or pedicles retained their presynaptic active zones: reconstruction of serially sectioned pedicles by using three- dimensional computer graphics revealed that 73% of the synaptic ribbons remained attached to the plasmalemma either at the cell surface or along its invaginations. Finally, tracer experiments that used horseradish peroxidase demonstrated that dissociated rod cells recycled synaptic vesicle membrane in the dark and thus probably released transmitter by exocytosis. Under optimal conditions, a maximum of 40% of the synaptic vesicles within the pedicle were labeled. As in the intact retina, uptake of horseradish peroxidase was suppressed by light. Thus, freshly dissociated receptor neurons retained many of their adult morphological and physiological characteristics. In long- term culture, the photoreceptors tended to round up; however, active zones were present even 2 wk after removal of the postsynaptic processes. The Rockefeller University Press 1985-01-01 /pmc/articles/PMC2113495/ /pubmed/3965470 Text en 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 | Articles Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title | Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title_full | Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title_fullStr | Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title_full_unstemmed | Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title_short | Rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
title_sort | rod cells dissociated from mature salamander retina: ultrastructure and uptake of horseradish peroxidase |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2113495/ https://www.ncbi.nlm.nih.gov/pubmed/3965470 |