Characterization of shear-sensitive genes in the normal rat aorta identifies Hand2 as a major flow-responsive transcription factor
| Autor: | Tino Ebbers, Hanna M. Björck, Johan Renner, Lasse Folkersen, Per Eriksson, Matts Karlsson, Siv F. E. Nilsson, Toste Länne, Shohreh Maleki, Johan Kihlberg |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Fysiologi Anatomy and Physiology Physiology Microarrays lcsh:Medicine Gene Expression Strömningsmekanik och akustik Aorta Thoracic 030204 cardiovascular system & hematology Cardiovascular Cardiovascular System 0302 clinical medicine Gene expression Molecular Cell Biology Basic Helix-Loop-Helix Transcription Factors Thoracic aorta magnetic resonance imaging Cardiovascular Imaging lcsh:Science Aorta Oligonucleotide Array Sequence Analysis Regulation of gene expression 0303 health sciences Multidisciplinary biology Fluid Mechanics and Acoustics Cell biology cardiovascular system Medicine DNA microarray HAND2 Shear Strength Research Article Histology Aortic Diseases computational fluid dynamics 03 medical and health sciences In vivo Vascular Biology medicine.artery medicine Animals Rats Wistar Gene Transcription factor Biology 030304 developmental biology lcsh:R Hemodynamics Computational Biology Molecular biology wall shear stress Rats biology.protein gene expression lcsh:Q Stress Mechanical |
| Zdroj: | PLoS ONE PLoS ONE; Vol 7 PLoS ONE, Vol 7, Iss 12, p e52227 (2012) |
| ISSN: | 1932-6203 |
| Popis: | OBJECTIVE: Shear forces play a key role in the maintenance of vessel wall integrity. Current understanding regarding shear-dependent gene expression is mainly based on in vitro or in vivo observations with experimentally deranged shear, hence reflecting acute molecular events in relation to flow. Our objective was to combine computational fluid dynamic (CFD) simulations with global microarray analysis to study flow-dependent vessel wall biology in the aortic wall under physiological conditions. METHODS AND RESULTS: Male Wistar rats were used. Animal-specific wall shear stress (WSS) magnitude and vector direction were estimated using CFD based on aortic geometry and flow information acquired by magnetic resonance imaging. Two distinct flow pattern regions were identified in the normal rat aortic arch; the distal part of the lesser curvature being exposed to low WSS and a non-uniform vector direction, and a region along the greater curvature being subjected to markedly higher levels of WSS and a uniform vector direction. Microarray analysis identified numerous novel mechanosensitive genes, including Trpc4 and Fgf12, and confirmed well-known ones, e.g. Klf2 and Nrf2. Gene ontology analysis revealed an over-representation of genes involved in transcriptional regulation. The most differentially expressed gene, Hand2, is a transcription factor previously shown to be involved in extracellular matrix remodeling. HAND2 protein was endothelial specific and showed higher expression in the regions exposed to low WSS with disturbed flow. CONCLUSIONS: Microarray analysis validated the CFD-defined WSS regions in the rat aortic arch, and identified numerous novel shear-sensitive genes. Defining the functional importance of these genes in relation to atherosusceptibility may provide important insight into the understanding of vascular pathology. |
| Databáze: | OpenAIRE |
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