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Peridynamic Modeling of Ruptures in Biomembranes
We simulate the formation of spontaneous ruptures in supported phospholipid double bilayer membranes, using peridynamic modeling. Experiments performed on spreading double bilayers typically show two distinct kinds of ruptures, floral and fractal, which form spontaneously in the distal (upper) bilay...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5102442/ https://www.ncbi.nlm.nih.gov/pubmed/27829001 http://dx.doi.org/10.1371/journal.pone.0165947 |
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author | Taylor, Michael Gözen, Irep Patel, Samir Jesorka, Aldo Bertoldi, Katia |
author_facet | Taylor, Michael Gözen, Irep Patel, Samir Jesorka, Aldo Bertoldi, Katia |
author_sort | Taylor, Michael |
collection | PubMed |
description | We simulate the formation of spontaneous ruptures in supported phospholipid double bilayer membranes, using peridynamic modeling. Experiments performed on spreading double bilayers typically show two distinct kinds of ruptures, floral and fractal, which form spontaneously in the distal (upper) bilayer at late stages of double bilayer formation on high energy substrates. It is, however, currently unresolved which factors govern the occurrence of either rupture type. Variations in the distance between the two bilayers, and the occurrence of interconnections (“pinning sites”) are suspected of contributing to the process. Our new simulations indicate that the pinned regions which form, presumably due to Ca(2+) ions serving as bridging agent between the distal and the proximal bilayer, act as nucleation sites for the ruptures. Moreover, assuming that the pinning sites cause a non-zero shear modulus, our simulations also show that they change the rupture mode from floral to fractal. At zero shear modulus the pores appear to be circular, subsequently evolving into floral pores. With increasing shear modulus the pore edges start to branch, favoring fractal morphologies. We conclude that the pinning sites may indirectly determine the rupture morphology by contributing to shear stress in the distal membrane. |
format | Online Article Text |
id | pubmed-5102442 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-51024422016-11-18 Peridynamic Modeling of Ruptures in Biomembranes Taylor, Michael Gözen, Irep Patel, Samir Jesorka, Aldo Bertoldi, Katia PLoS One Research Article We simulate the formation of spontaneous ruptures in supported phospholipid double bilayer membranes, using peridynamic modeling. Experiments performed on spreading double bilayers typically show two distinct kinds of ruptures, floral and fractal, which form spontaneously in the distal (upper) bilayer at late stages of double bilayer formation on high energy substrates. It is, however, currently unresolved which factors govern the occurrence of either rupture type. Variations in the distance between the two bilayers, and the occurrence of interconnections (“pinning sites”) are suspected of contributing to the process. Our new simulations indicate that the pinned regions which form, presumably due to Ca(2+) ions serving as bridging agent between the distal and the proximal bilayer, act as nucleation sites for the ruptures. Moreover, assuming that the pinning sites cause a non-zero shear modulus, our simulations also show that they change the rupture mode from floral to fractal. At zero shear modulus the pores appear to be circular, subsequently evolving into floral pores. With increasing shear modulus the pore edges start to branch, favoring fractal morphologies. We conclude that the pinning sites may indirectly determine the rupture morphology by contributing to shear stress in the distal membrane. Public Library of Science 2016-11-09 /pmc/articles/PMC5102442/ /pubmed/27829001 http://dx.doi.org/10.1371/journal.pone.0165947 Text en © 2016 Taylor et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Taylor, Michael Gözen, Irep Patel, Samir Jesorka, Aldo Bertoldi, Katia Peridynamic Modeling of Ruptures in Biomembranes |
title | Peridynamic Modeling of Ruptures in Biomembranes |
title_full | Peridynamic Modeling of Ruptures in Biomembranes |
title_fullStr | Peridynamic Modeling of Ruptures in Biomembranes |
title_full_unstemmed | Peridynamic Modeling of Ruptures in Biomembranes |
title_short | Peridynamic Modeling of Ruptures in Biomembranes |
title_sort | peridynamic modeling of ruptures in biomembranes |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5102442/ https://www.ncbi.nlm.nih.gov/pubmed/27829001 http://dx.doi.org/10.1371/journal.pone.0165947 |
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