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A Calcium Phosphate-Induced Mouse Abdominal Aortic Aneurysm Model
Published on: November 18, 2022
Tenascin-C is expressed in abdominal aortic aneurysm tissue with an active degradation process
Taizo Kimura1, Koichi Yoshimura, Hiroki Aoki
1Department of Molecular Cardiovascular Biology, Yamaguchi University School of Medicine, Kurume, Japan.
Pathology International
|September 29, 2011
Summary
Tenascin-C (TN-C) may indicate abdominal aortic aneurysm (AAA) status. High TN-C expression in AAA correlates with tissue destruction and rapid expansion, suggesting its potential as a biomarker.
Area of Science:
- Cardiovascular Biology
- Biomarker Discovery
- Vascular Pathology
Background:
- Abdominal aortic aneurysm (AAA) is a prevalent condition characterized by aortic wall weakening and dilation, often leading to rupture.
- Currently, no established biomarkers effectively indicate the disease status of AAA.
- Tenascin-C (TN-C), a matricellular protein, is synthesized during pathological processes.
Purpose of the Study:
- To investigate the relationship between Tenascin-C (TN-C) expression and the clinical course and histopathology of abdominal aortic aneurysm (AAA).
- To determine if the expression pattern of TN-C can serve as an indicator of AAA status.
Main Methods:
- Analysis of TN-C and matrix metalloproteinase (MMP)-9 expression in human AAA tissues.
- Examination of TN-C deposition patterns in relation to cellular components (smooth muscle cells, macrophages) and MMP-9.
- Utilizing a mouse model of AAA to correlate high TN-C expression with AAA diameter expansion.
- Histological analysis to identify the cellular sources and localization of TN-C in AAA.
Main Results:
- Both TN-C and MMP-9 were found to be highly expressed in human AAA.
- In human AAA, TN-C deposition was linked to tissue destruction and primarily overlapped with smooth muscle actin-positive cells, distinct from macrophages and MMP-9.
- High TN-C expression in a mouse AAA model correlated with rapid increases in AAA diameter.
- Histological findings indicated that vascular smooth muscle cells were the main producers of TN-C, with deposition in the medial layer during inflammation and tissue degradation.
Conclusions:
- Tenascin-C (TN-C) expression is significantly associated with pathological processes in abdominal aortic aneurysm (AAA).
- The distinct deposition pattern of TN-C in AAA suggests its role in tissue destruction mediated by smooth muscle cells.
- TN-C shows potential as a valuable biomarker for assessing the pathological status of smooth muscle cells and interstitial cells within AAA.
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