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Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits
Hemodynamics may play an essential role in the initiation and progression of abdominal aortic aneurysm (AAA). We aimed to study the mechanism of self-healing process by the changes of hemodynamics and pathology in an enlarging AAA in rabbits. Seventy-two rabbits were randomly divided into three grou...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6185729/ https://www.ncbi.nlm.nih.gov/pubmed/30312321 http://dx.doi.org/10.1371/journal.pone.0205366 |
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author | Chen, Hongmei Bi, Yonghua Ju, Siyeong Gu, Linxia Zhu, Xiaoyan Han, Xinwei |
author_facet | Chen, Hongmei Bi, Yonghua Ju, Siyeong Gu, Linxia Zhu, Xiaoyan Han, Xinwei |
author_sort | Chen, Hongmei |
collection | PubMed |
description | Hemodynamics may play an essential role in the initiation and progression of abdominal aortic aneurysm (AAA). We aimed to study the mechanism of self-healing process by the changes of hemodynamics and pathology in an enlarging AAA in rabbits. Seventy-two rabbits were randomly divided into three groups. Rabbits underwent extrinsic coarctation and received a 10-minute elastase incubation in Group A and Group B. Absorbable suture used in Group A was terminated by balloon dilation at week 4. Diameter was measured after 1, 3, 5, and 15 weeks, computational fluid dynamics analysis was performed at week 3 and week 15. Rabbits were sacrificed after 1, 5, and 15 weeks for pathological and quantitative studies. The higher velocity magnitude, intensified bulk flow and obvious vortex formation were observed in Group A at week 3 instead of week 15. Both low wall shear stress and high relative residence time increased in Group B, however, high oscillatory shear index had relatively less increase compared with Group A. Aortic diameter reached a plateau at 5 weeks in Group A, which was significantly lower than in week 15 in Group B. Intimal hyperplasia, intima-media thickness increased significantly in Group A at week 5, significantly higher than in week 15 in Group B. Marked destruction of elastin fibers and smooth muscle cells occurred at week 1, and increased significantly at week 15 in Group A. Aneurysm exhibited strong expression of matrix metalloproteinase 9 and mouse anti-rabbit macrophage 11 at week 1, and showed a tendency to decrease. Matrix metalloproteinase 2 expression decreased significantly in Group B at week 15 compared with week 5 and Group A. In conclusion, the self-healing of rabbit AAA may attributed to the regeneration of smooth muscle cells. The turbulence flow caused by coarctation is associated with continuous growth of rabbit AAA and prevents the self-healing phenomenon. |
format | Online Article Text |
id | pubmed-6185729 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-61857292018-10-26 Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits Chen, Hongmei Bi, Yonghua Ju, Siyeong Gu, Linxia Zhu, Xiaoyan Han, Xinwei PLoS One Research Article Hemodynamics may play an essential role in the initiation and progression of abdominal aortic aneurysm (AAA). We aimed to study the mechanism of self-healing process by the changes of hemodynamics and pathology in an enlarging AAA in rabbits. Seventy-two rabbits were randomly divided into three groups. Rabbits underwent extrinsic coarctation and received a 10-minute elastase incubation in Group A and Group B. Absorbable suture used in Group A was terminated by balloon dilation at week 4. Diameter was measured after 1, 3, 5, and 15 weeks, computational fluid dynamics analysis was performed at week 3 and week 15. Rabbits were sacrificed after 1, 5, and 15 weeks for pathological and quantitative studies. The higher velocity magnitude, intensified bulk flow and obvious vortex formation were observed in Group A at week 3 instead of week 15. Both low wall shear stress and high relative residence time increased in Group B, however, high oscillatory shear index had relatively less increase compared with Group A. Aortic diameter reached a plateau at 5 weeks in Group A, which was significantly lower than in week 15 in Group B. Intimal hyperplasia, intima-media thickness increased significantly in Group A at week 5, significantly higher than in week 15 in Group B. Marked destruction of elastin fibers and smooth muscle cells occurred at week 1, and increased significantly at week 15 in Group A. Aneurysm exhibited strong expression of matrix metalloproteinase 9 and mouse anti-rabbit macrophage 11 at week 1, and showed a tendency to decrease. Matrix metalloproteinase 2 expression decreased significantly in Group B at week 15 compared with week 5 and Group A. In conclusion, the self-healing of rabbit AAA may attributed to the regeneration of smooth muscle cells. The turbulence flow caused by coarctation is associated with continuous growth of rabbit AAA and prevents the self-healing phenomenon. Public Library of Science 2018-10-12 /pmc/articles/PMC6185729/ /pubmed/30312321 http://dx.doi.org/10.1371/journal.pone.0205366 Text en © 2018 Chen 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 Chen, Hongmei Bi, Yonghua Ju, Siyeong Gu, Linxia Zhu, Xiaoyan Han, Xinwei Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title | Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title_full | Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title_fullStr | Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title_full_unstemmed | Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title_short | Hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
title_sort | hemodynamics and pathology of an enlarging abdominal aortic aneurysm model in rabbits |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6185729/ https://www.ncbi.nlm.nih.gov/pubmed/30312321 http://dx.doi.org/10.1371/journal.pone.0205366 |
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