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Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling
The expansion of the plasma membrane, which occurs during osmotic swelling of epithelia, must be retrieved for volume recovery, but the mechanisms are unknown. Here we have identified myosin light chain kinase (MLCK) as a regulator of membrane internalization in response to osmotic swelling in a mo...
Autores principales: | , , , |
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Formato: | Texto |
Lenguaje: | English |
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The American Society for Cell Biology
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3046060/ https://www.ncbi.nlm.nih.gov/pubmed/21209319 http://dx.doi.org/10.1091/mbc.E10-06-0514 |
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author | Barfod, Elisabeth T. Moore, Ann L. Van de Graaf, Benjamin G. Lidofsky, Steven D. |
author_facet | Barfod, Elisabeth T. Moore, Ann L. Van de Graaf, Benjamin G. Lidofsky, Steven D. |
author_sort | Barfod, Elisabeth T. |
collection | PubMed |
description | The expansion of the plasma membrane, which occurs during osmotic swelling of epithelia, must be retrieved for volume recovery, but the mechanisms are unknown. Here we have identified myosin light chain kinase (MLCK) as a regulator of membrane internalization in response to osmotic swelling in a model liver cell line. On hypotonic exposure, we found that there was time-dependent phosphorylation of the MLCK substrate myosin II regulatory light chain. At the sides of the cell, MLCK and myosin II localized to swelling-induced membrane blebs with actin just before retraction, and MLCK inhibition led to persistent blebbing and attenuated cell volume recovery. At the base of the cell, MLCK also localized to dynamic actin-coated rings and patches upon swelling, which were associated with uptake of the membrane marker FM4-64X, consistent with sites of membrane internalization. Hypotonic exposure evoked increased biochemical association of the cell volume regulator Src with MLCK and with the endocytosis regulators cortactin and dynamin, which colocalized within these structures. Inhibition of either Src or MLCK led to altered patch and ring lifetimes, consistent with the concept that Src and MLCK form a swelling-induced protein complex that regulates volume recovery through membrane turnover and compensatory endocytosis under osmotic stress. |
format | Text |
id | pubmed-3046060 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | The American Society for Cell Biology |
record_format | MEDLINE/PubMed |
spelling | pubmed-30460602011-05-16 Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling Barfod, Elisabeth T. Moore, Ann L. Van de Graaf, Benjamin G. Lidofsky, Steven D. Mol Biol Cell Articles The expansion of the plasma membrane, which occurs during osmotic swelling of epithelia, must be retrieved for volume recovery, but the mechanisms are unknown. Here we have identified myosin light chain kinase (MLCK) as a regulator of membrane internalization in response to osmotic swelling in a model liver cell line. On hypotonic exposure, we found that there was time-dependent phosphorylation of the MLCK substrate myosin II regulatory light chain. At the sides of the cell, MLCK and myosin II localized to swelling-induced membrane blebs with actin just before retraction, and MLCK inhibition led to persistent blebbing and attenuated cell volume recovery. At the base of the cell, MLCK also localized to dynamic actin-coated rings and patches upon swelling, which were associated with uptake of the membrane marker FM4-64X, consistent with sites of membrane internalization. Hypotonic exposure evoked increased biochemical association of the cell volume regulator Src with MLCK and with the endocytosis regulators cortactin and dynamin, which colocalized within these structures. Inhibition of either Src or MLCK led to altered patch and ring lifetimes, consistent with the concept that Src and MLCK form a swelling-induced protein complex that regulates volume recovery through membrane turnover and compensatory endocytosis under osmotic stress. The American Society for Cell Biology 2011-03-01 /pmc/articles/PMC3046060/ /pubmed/21209319 http://dx.doi.org/10.1091/mbc.E10-06-0514 Text en © 2011 Barfod et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,“ “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology. |
spellingShingle | Articles Barfod, Elisabeth T. Moore, Ann L. Van de Graaf, Benjamin G. Lidofsky, Steven D. Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title | Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title_full | Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title_fullStr | Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title_full_unstemmed | Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title_short | Myosin light chain kinase and Src control membrane dynamics in volume recovery from cell swelling |
title_sort | myosin light chain kinase and src control membrane dynamics in volume recovery from cell swelling |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3046060/ https://www.ncbi.nlm.nih.gov/pubmed/21209319 http://dx.doi.org/10.1091/mbc.E10-06-0514 |
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