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Quantitative Micro-CT Analysis of Aortopathy in a Mouse Model of β-aminopropionitrile-induced Aortic Aneurysm and Dissection
Published on: July 16, 2018
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Interleukin-3 is required for thoracic aneurysm and dissection in a mouse model
Clinton S Robbins1, John S Byrne2
1Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada.
Clinical Science (London, England : 1979)
|June 23, 2018
Summary
Interleukin-3 (IL-3) drives thoracic aortic aneurysm and dissection (TAAD) by promoting protease release from macrophages. Blocking IL-3 reduced protease activity and protected mice from TAAD, revealing a key mechanism in aortic disease.
Area of Science:
- Cardiovascular Biology
- Immunology
- Molecular Medicine
Background:
- Thoracic aortic aneurysm and dissection (TAAD) pathogenesis involves inflammation and protease-mediated elastic fiber disruption.
- The roles of vascular smooth cells and macrophages in TAAD are not fully understood.
Purpose of the Study:
- To investigate the mechanism of vascular smooth cell and macrophage involvement in TAAD using a mouse model.
- To determine the role of interleukin-3 (IL-3) in TAAD pathogenesis.
Main Methods:
- Utilized a mouse model to study TAAD.
- Investigated the effect of IL-3 on matrix metalloproteinase 12 (MMP12) release from macrophages via mitogen-activated protein kinase pathways.
- Analyzed IL-3 knockout mice for aortic wall MMP12 levels and protease activity.
Main Results:
- IL-3 stimulated MMP12 release from macrophages.
- IL-3 knockout mice exhibited significantly reduced aortic wall MMP12 and protease activity.
- Reduced MMP12 and protease activity were associated with protection against TAAD.
Conclusions:
- Aortic vascular smooth cell-derived IL-3 plays a central role in TAAD pathogenesis.
- IL-3 promotes TAAD by stimulating macrophage MMP12 release.
- Targeting the IL-3 pathway may offer a protective strategy against TAAD.
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