Related Experiment Video
Updated: May 27, 2026
Optimization of the Longa Middle Cerebral Artery Occlusion Method for Complete Reperfusion
Published on: November 22, 2024
Optimizing suture middle cerebral artery occlusion model in C57BL/6 mice circumvents posterior communicating artery
Falei Yuan1, Yaohui Tang, Xiaojie Lin
1Neuroscience and Neuroengineering Center, Med-X Research Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Abstract:
The suture middle cerebral artery occlusion (MCAO) model is used worldwide in both academia and industry. However, the variable occurrence of dysplasia in posterior communicating arteries (PcomAs) induces high mortality and instability in permanent MCAO models, limiting the model's application to transient focal ischemia. In particular, high mortality in intraluminal suture MCAO models is associated with the dysplasia of PcomAs in C57BL/6 mice. Optimization of silicone coating length is critical for reducing mortality and generating stable infarct in this model. The aim of our study is to reduce mortality and improve the reproducibility of the intraluminal suture MCAO model in C57BL/6 mice, which have high variation in PcomA dysplasia. Adult male C57BL/6 mice (n=38) underwent MCAO using sutures with various diameters and silicone coating lengths. The occlusion of cerebral vessels was examined by synchrotron radiation live angiography. The morphology of PcomAs was examined under a microscope after MICROFIL(®) infusion. Neurological outcome, infarct volume, and mortality were examined within 28 days. Optimizing the silicone coating on an 8-0 suture tip, we were able to reduce the model mortality to zero after permanent occlusion in C57BL/6 and produce stable brain infarct volume independent of the patency of PcomAs.
Insights
Optimizing suture coating in the middle cerebral artery occlusion (MCAO) model significantly reduces mortality in C57BL/6 mice. This refinement ensures stable brain infarcts, improving the model
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Animal Models
Background:
- The suture middle cerebral artery occlusion (MCAO) model is widely used for studying focal cerebral ischemia.
- High mortality and variability in permanent MCAO models are linked to posterior communicating artery (PcomA) dysplasia in C57BL/6 mice.
- Existing MCAO models often limit research to transient ischemia due to instability and high mortality.
Purpose of the Study:
- To reduce mortality and enhance the reproducibility of the permanent intraluminal suture MCAO model in C57BL/6 mice.
- To optimize suture parameters, specifically silicone coating length, to mitigate MCAO model complications.
- To establish a stable and reliable MCAO model for permanent focal ischemia research.
Main Methods:
- Adult male C57BL/6 mice (n=38) underwent permanent MCAO using sutures with varied diameters and silicone coating lengths.
- Cerebral vessel occlusion was confirmed using synchrotron radiation live angiography.
- Posterior communicating artery morphology was analyzed post-MICROFIL infusion; neurological outcomes, infarct volumes, and mortality were assessed over 28 days.
Main Results:
- Optimizing the silicone coating length on an 8-0 suture tip resulted in zero mortality after permanent MCAO in C57BL/6 mice.
- The optimized MCAO model produced stable brain infarct volumes, irrespective of posterior communicating artery patency.
- This methodological refinement enhances the reliability and applicability of the permanent MCAO model.
Conclusions:
- Optimized silicone coating length is critical for reducing mortality in permanent MCAO models using C57BL/6 mice.
- The refined MCAO technique provides a reproducible method for inducing stable infarcts, suitable for permanent focal ischemia studies.
- This advancement improves the utility of the MCAO model in both academic and industrial research settings.
