Increased expression of Lamin A/C correlates with regions of high wall-stress in abdominal aortic aneurysms.

Malkawi, Amir and Pirianov, Grisha and Torsney, Evelyn and Chetter, Ian and Sakalihasan, Natzi and Loftus, Ian and Norden, Ian and Huggins, Christopher and Charolidi, Nicoletta and Thompson, Matt and Xu, Xie Yun and Cockerill, Gillian W. (2015) Increased expression of Lamin A/C correlates with regions of high wall-stress in abdominal aortic aneurysms. Aorta, 3 (5). pp. 152-166. ISSN 2325-4637

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Official URL: http://doi.org/10.12945/j.aorta.2015.14.069

Abstract

Background: Since aortic diameter is the most significant risk factor for rupture, we sought to identify stress-dependent changes in gene expression to illuminate novel molecular processes in aneurysm rupture. Materials and Methods: We constructed finite element maps of abdominal computerized tomography scans (CTs) of seven abdominal aortic aneurysm (AAA) patients to map wall stress. Paired biopsies from high- and low-stress areas were collected at surgery using vascular landmarks as coordinates. Differential gene expression was evaluated by Illumina Array analysis, using the whole genome DNA-mediated, annealing, selection, extension, and ligation (DASL) gene chip (n = 3 paired samples). Results: The sole significant candidate from this analysis, Lamin A/C, was validated at the protein level, using western blotting. Lamin A/C expression in the inferior mesenteric vein (IMV) of AAA patients was compared to a control group and in aortic smooth muscle cells in culture in response to physiological pulsatile stretch. Areas of high wall stress (n = 7) correlate to those regions which have the thinnest walls [778 µm (585–1120 µm)] in comparison to areas of lowest wall stress [1620 µm (962–2919 µm)]. Induced expression of Lamin A/C correlated with areas of high wall stress from AAAs but was not significantly induced in the IMV from AAA patients compared to controls (n = 16). Stress-induced expression of Lamin A/C was mimicked by exposing aortic smooth muscle cells to prolonged pulsatile stretch. Conclusion: Lamin A/C protein is specifically increased in areas of high wall stress in AAA from patients, but is not increased on other vascular beds of aneurysm patients, suggesting that its elevation may be a compensatory response to the pathobiology leading to aneurysms.

Item Type: Journal Article
Keywords: Nuclear lamina, Stretch, Aging
Depositing User: Unnamed user with email grisha.pirianov@anglia.ac.uk
Date Deposited: 18 Aug 2016 10:45
Last Modified: 18 Aug 2016 10:45
URI: http://arro.anglia.ac.uk/id/eprint/700715

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