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Characteristics of TAV- and BAV-associated thoracic aortic aneurysms-Smooth muscle cell biology, expression profiling, and histological analyses.
MedLine Citation:
PMID:  22178424     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: Past studies on the pathogenesis of thoracic aortic aneurysms have, by concentrating on histological and total tissue analyses, revealed several disease-relevant processes. Despite these studies, there is still a significant lack in the understanding of aneurysmal cell biology today. Hence, it was the goal of this study to assess differences between aneurysmal and healthy aortic smooth muscle cells (SMCs) on a broad - screening-like - basis, allowing us to formulate new hypotheses on the role of SMCs in thoracic aneurysm formation. METHODS AND RESULTS: After histological characterization of a total of 16 samples from healthy aortas and thoracic aortic aneurysms (TAA) of patients with bicuspid (BAV) and tricuspid (TAV) aortic valves, we isolated aortic SMCs and subjected them to cell biological and gene expression analyses. The data obtained indicate that aneurysmal SMCs exert reduced proliferation and migration rates compared to controls. BAV TAA SMCs have significantly shorter telomeres, whereas TAV TAA SMCs showed a reduced metabolic activity. In BAV TAA SMCs osteopontin (OPN) expression was significantly elevated, and TAV TAA SMCs showed decreased expression of tissue inhibitor of metalloproteinase 3 (TIMP3). CONCLUSION: Our study provides evidence that TAA-associated aortic wall disintegration in BAV and TAV TAAs shows similarities, but also significant differences. BAV and TAV TAAs differ with regard to medial elastic fiber mass and the occurrence of fibroblasts, SMC telomere length, metabolism, and gene expression. This study may form the basis for future in-depth analyses on the relevance of these findings in the pathophysiology of BAV and TAV TAAs.
Authors:
Stefan Blunder; Barbara Messner; Thomas Aschacher; Iris Zeller; Adrian Türkcan; Dominik Wiedemann; Martin Andreas; Gert Blüschke; Günther Laufer; Thomas Schachner; David Bernhard
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-28
Journal Detail:
Title:  Atherosclerosis     Volume:  -     ISSN:  1879-1484     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-12-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0242543     Medline TA:  Atherosclerosis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Cardiac Surgery Research Laboratory, Surgical Research Laboratories, Department of Surgery, Medical University of Vienna, Vienna, Austria; Cardiac Surgery Research Laboratory, Department of Cardiac Surgery, Medical University of Innsbruck, Innsbruck, Austria.
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