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Enhanced abdominal aortic aneurysm in TIMP-1-deficient mice
Mark K Eskandari1, Joseph D Vijungco, Amy Flores
1Division of Vascular Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA. meskanda@nmh.org
The Journal of Surgical Research
|February 1, 2005
Summary
Tissue inhibitor of metalloproteinase-1 (TIMP-1) protects against abdominal aortic aneurysm (AAA) development. Mice lacking TIMP-1 experienced larger aneurysms in an experimental model, highlighting TIMP-1's protective role.
Area of Science:
- Vascular Biology
- Matrix Biology
- Atherosclerosis Research
Background:
- Matrix metalloproteinases (MMPs) mediate abdominal aortic aneurysm (AAA) degeneration.
- Tissue inhibitors of MMPs (TIMPs) regulate MMP activity, maintaining arterial integrity.
- Imbalances between MMPs and TIMPs can compromise vascular health.
Purpose of the Study:
- To investigate the protective role of TIMP-1 in an elastase-induced murine model of AAA.
- To determine if TIMP-1 deficiency exacerbates aneurysm formation.
Main Methods:
- Utilized wild-type (TIMP-1+/+) and knockout (TIMP-1-/-) mice.
- Induced aneurysms via infrarenal aortic infusion of pancreatic elastase.
- Measured aortic diameters pre- and post-infusion and at 14-day follow-up.
Main Results:
- TIMP-1-/- mice exhibited significantly greater aortic diameter increases post-elastase infusion compared to wild-types.
- Both saline and elastase infusions led to larger aortic diameters in TIMP-1-/- mice at sacrifice.
- Aneurysm formation was significantly more pronounced in the absence of TIMP-1.
Conclusions:
- TIMP-1 deficiency leads to exacerbated aneurysm development in a murine model.
- TIMP-1 demonstrates a protective effect in experimental AAA.
- Targeting TIMP-1 may offer a therapeutic strategy for controlling aneurysm growth.