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Updated: Mar 5, 2026
Modeling Stroke in Mice - Middle Cerebral Artery Occlusion with the Filament Model
Published on: January 6, 2011
Extracerebral Tissue Damage in the Intraluminal Filament Mouse Model of Middle Cerebral Artery Occlusion
Markus Vaas1, Ruiqing Ni1, Markus Rudin2
1Institute for Biomedical Engineering, University of Zurich, ETH , Zurich , Switzerland.
Abstract:
Middle cerebral artery occlusion is the most common model of focal cerebral ischemia in the mouse. In the surgical procedure, the external carotid artery (ECA) is ligated; however, its effect on the tissue supplied by the vessel has not been described so far. C57BL/6 mice underwent 1 h of transient MCAO (tMCAO) or sham surgery. Multi-spectral optoacoustic tomography was employed at 30 min after surgery to assess oxygenation in the temporal muscles. Microstructural changes were assessed with magnetic resonance imaging and histological examination at 24 h and 48 h after surgery. Ligation of the ECA resulted in decreased oxygenation of the left temporal muscle in most sham-operated and tMCAO animals. Susceptible mice of both groups exhibited increased T2 relaxation times in the affected muscle with histological evidence of myofibre degeneration, interstitial edema, and neutrophil influx. Ligatures had induced an extensive neutrophil-dominated inflammatory response. ECA ligation leads to distinct hypoxic degenerative changes in the tissue of the ECA territory and to ligature-induced inflammatory processes. An impact on outcome needs to be considered in this stroke model.
Insights
External carotid artery (ECA) ligation, common in stroke models, causes hypoxia and inflammation in temporal muscles. This affects study outcomes, requiring careful consideration in research.
Area of Science:
- Neuroscience
- Ischemic Stroke Research
- Animal Models
Background:
- Transient middle cerebral artery occlusion (tMCAO) is a standard mouse model for focal cerebral ischemia.
- The ligation of the external carotid artery (ECA) is a procedural step in tMCAO models.
- The physiological impact of ECA ligation on its supplied tissues remains largely undescribed.
Purpose of the Study:
- To investigate the effects of external carotid artery (ECA) ligation on tissue oxygenation and microstructure.
- To assess the inflammatory response induced by ECA ligation in a mouse stroke model.
- To determine the potential impact of ECA ligation on the outcomes of cerebral ischemia studies.
Main Methods:
- Multi-spectral optoacoustic tomography (MSOT) for assessing muscle oxygenation post-surgery.
- Magnetic resonance imaging (MRI) and histological analysis for evaluating microstructural changes.
- Comparison of sham-operated and tMCAO mice undergoing ECA ligation.
Main Results:
- ECA ligation led to decreased oxygenation in the temporal muscle of most mice.
- Increased T2 relaxation times and histological evidence of myofiber degeneration, edema, and neutrophil influx were observed.
- A significant neutrophil-dominated inflammatory response was induced by the ligatures.
Conclusions:
- ECA ligation causes localized hypoxia, degenerative changes, and inflammation within the ECA territory.
- These findings highlight potential confounding effects of ECA ligation on stroke model outcomes.
- Researchers should consider the impact of ECA ligation in interpreting results from tMCAO studies.
