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Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization
MAP1B and MAP2 are major members of neuronal microtubule-associated proteins (MAPs). To gain insights into the function of MAP2 in vivo, we generated MAP2-deficient (map2(−/)−) mice. They developed without any apparent abnormalities, which indicates that MAP2 is dispensable in mouse survival. Becaus...
Autores principales: | , , , , , |
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
2001
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2150794/ https://www.ncbi.nlm.nih.gov/pubmed/11581286 http://dx.doi.org/10.1083/jcb.200106025 |
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author | Teng, Junlin Takei, Yosuke Harada, Akihiro Nakata, Takao Chen, Jianguo Hirokawa, Nobutaka |
author_facet | Teng, Junlin Takei, Yosuke Harada, Akihiro Nakata, Takao Chen, Jianguo Hirokawa, Nobutaka |
author_sort | Teng, Junlin |
collection | PubMed |
description | MAP1B and MAP2 are major members of neuronal microtubule-associated proteins (MAPs). To gain insights into the function of MAP2 in vivo, we generated MAP2-deficient (map2(−/)−) mice. They developed without any apparent abnormalities, which indicates that MAP2 is dispensable in mouse survival. Because previous reports suggest a functional redundancy among MAPs, we next generated mice lacking both MAP2 and MAP1B to test their possible synergistic functions in vivo. Map2 (−) (/)−map1b (−/)− mice died in their perinatal period. They showed not only fiber tract malformations but also disrupted cortical patterning caused by retarded neuronal migration. In spite of this, their cortical layer maintained an “inside-out” pattern. Detailed observation of primary cultures of hippocampal neurons from map2 (−/)−map1b (−/)− mice revealed inhibited microtubule bundling and neurite elongation. In these neurons, synergistic effects caused by the loss of MAP2 and MAP1B were more apparent in dendrites than in axons. The spacing of microtubules was reduced significantly in map2 (−/)−map1b (−/)− mice in vitro and in vivo. These results suggest that MAP2 and MAP1B have overlapping functions in neuronal migration and neurite outgrowth by organizing microtubules in developing neurons both for axonal and dendritic morphogenesis but more dominantly for dendritic morphogenesis. |
format | Text |
id | pubmed-2150794 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2001 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21507942008-05-01 Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization Teng, Junlin Takei, Yosuke Harada, Akihiro Nakata, Takao Chen, Jianguo Hirokawa, Nobutaka J Cell Biol Article MAP1B and MAP2 are major members of neuronal microtubule-associated proteins (MAPs). To gain insights into the function of MAP2 in vivo, we generated MAP2-deficient (map2(−/)−) mice. They developed without any apparent abnormalities, which indicates that MAP2 is dispensable in mouse survival. Because previous reports suggest a functional redundancy among MAPs, we next generated mice lacking both MAP2 and MAP1B to test their possible synergistic functions in vivo. Map2 (−) (/)−map1b (−/)− mice died in their perinatal period. They showed not only fiber tract malformations but also disrupted cortical patterning caused by retarded neuronal migration. In spite of this, their cortical layer maintained an “inside-out” pattern. Detailed observation of primary cultures of hippocampal neurons from map2 (−/)−map1b (−/)− mice revealed inhibited microtubule bundling and neurite elongation. In these neurons, synergistic effects caused by the loss of MAP2 and MAP1B were more apparent in dendrites than in axons. The spacing of microtubules was reduced significantly in map2 (−/)−map1b (−/)− mice in vitro and in vivo. These results suggest that MAP2 and MAP1B have overlapping functions in neuronal migration and neurite outgrowth by organizing microtubules in developing neurons both for axonal and dendritic morphogenesis but more dominantly for dendritic morphogenesis. The Rockefeller University Press 2001-10-01 /pmc/articles/PMC2150794/ /pubmed/11581286 http://dx.doi.org/10.1083/jcb.200106025 Text en Copyright © 2001, 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 Teng, Junlin Takei, Yosuke Harada, Akihiro Nakata, Takao Chen, Jianguo Hirokawa, Nobutaka Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title | Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title_full | Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title_fullStr | Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title_full_unstemmed | Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title_short | Synergistic effects of MAP2 and MAP1B knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
title_sort | synergistic effects of map2 and map1b knockout in neuronal migration, dendritic outgrowth, and microtubule organization |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2150794/ https://www.ncbi.nlm.nih.gov/pubmed/11581286 http://dx.doi.org/10.1083/jcb.200106025 |
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