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Neuroradiology
Published in: Neuroradiology 12/2007

01-12-2007 | Functional Neuroradiology

The influence of hemodynamic forces on biomarkers in the walls of elastase-induced aneurysms in rabbits

Authors: Ramanathan Kadirvel, Yong-Hong Ding, Daying Dai, Hasballah Zakaria, Anne M. Robertson, Mark A. Danielson, Debra A. Lewis, Harry J. Cloft, David F. Kallmes

Published in: Neuroradiology | Issue 12/2007

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Abstract

Introduction

Biological and biophysical factors have been shown to play an important role in the initiation, progression, and rupture of intracranial aneurysms. The purpose of this study was to evaluate the association between hemodynamic forces and markers of vascular remodeling in elastase-induced saccular aneurysms in rabbits.

Methods

Elastase-induced aneurysms were created at the origin of the right common carotid artery in rabbits. Hemodynamic parameters were estimated using computational fluid dynamic simulations based on 3-D-reconstructed models of the vasculature. Expression of matrix metalloproteinases (MMPs), their inhibitors (TIMPs) and markers of vascular remodeling were measured in different spatial regions within the aneurysms.

Results

Altered expression of biological markers relative to controls was correlated with the locations of subnormal time-averaged wall shear stress (WSS) but not with the magnitude of pressure. In the aneurysms, WSS was low and expression of biological markers was significantly altered in a time-dependent fashion. At 2 weeks, an upregulation of active-MMP-2, downregulation of TIMP-1 and TIMP-2, and intact endothelium were found in aneurysm cavities. However, by 12 weeks, endothelial cells were absent or scattered, and levels of pro- and active-MMP-2 were not different from those in control arteries, but pro-MMP-9 and both TIMPs were upregulated.

Conclusion

These results reveal a strong, spatially localized correlation between diminished WSS and differential expression of biological markers of vascular remodeling in elastase-induced saccular aneurysms. The ability of the wall to function and maintain a healthy endothelium in a low shear environment appears to be significantly impaired by chronic exposure to low WSS.
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Metadata
Title
The influence of hemodynamic forces on biomarkers in the walls of elastase-induced aneurysms in rabbits
Authors
Ramanathan Kadirvel
Yong-Hong Ding
Daying Dai
Hasballah Zakaria
Anne M. Robertson
Mark A. Danielson
Debra A. Lewis
Harry J. Cloft
David F. Kallmes
Publication date
01-12-2007
Publisher
Springer-Verlag
Published in
Neuroradiology / Issue 12/2007
Print ISSN: 0028-3940
Electronic ISSN: 1432-1920
DOI
https://doi.org/10.1007/s00234-007-0295-0

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