Two-vessel Occlusion Mouse Model of Cerebral Ischemia-reperfusion
March 1st, 2019
11.4K views
A mouse model of cerebral ischemia-reperfusion is established to investigate the pathophysiology of stroke. We distally ligate the right middle cerebral artery and right common carotid artery and restore blood flow after 10 or 40 min of ischemia.
Overview
This study establishes a mouse model of cerebral ischemia-reperfusion to investigate the pathophysiology of stroke. The model involves distal ligation of the right middle cerebral artery and right common carotid artery, followed by restoration of blood flow after ischemia.
Key Study Components
Area of Science
- Neuroscience
- Stroke Research
- Animal Models
Background
- Cerebral ischemia-reperfusion is a critical area of study in stroke research.
- Understanding the immune response in the ischemic brain is essential for developing therapeutic strategies.
- This model allows for the examination of infarct volume and behavioral deficits.
- The low mortality rate makes it suitable for repeated experiments.
Purpose of Study
- To investigate the pathophysiology of stroke using a reliable mouse model.
- To assess the impact of ischemia-reperfusion on brain tissue and immune cell infiltration.
- To evaluate behavioral outcomes following cerebral ischemia-reperfusion.
Methods Used
- Two-vessel occlusion model for inducing cerebral ischemia.
- Distal ligation of the right middle cerebral artery and common carotid artery.
- Restoration of blood flow after 10 or 40 minutes of ischemia.
- Monitoring of surgical conditions and post-operative care for mice.
Main Results
- Induction of a stable infarct volume in the cortical areas.
- Characterization of immune cell infiltration in the ischemic brain.
- Assessment of behavioral deficits post-ischemia-reperfusion.
- Confirmation of blood flow disruption during the procedure.
Conclusions
- The model provides insights into the pathophysiology of stroke.
- It allows for the evaluation of therapeutic interventions targeting ischemic injury.
- Further studies can leverage this model to explore immune responses in stroke.
Frequently Asked Questions
What is the significance of this mouse model?
This model helps in understanding the mechanisms of stroke and testing potential treatments.
How is the ischemia induced in the model?
Ischemia is induced by distally ligating the right middle cerebral artery and common carotid artery.
What are the expected outcomes of the study?
Expected outcomes include the assessment of infarct volume and behavioral deficits.
What precautions are taken during the surgery?
Surgical tools are autoclaved, and the surgery area is sanitized with 70% ethanol.
What is the mortality rate associated with this model?
The mortality rate is low, making it suitable for repeated experiments.
How does this model contribute to stroke research?
It allows researchers to study the effects of ischemia-reperfusion on brain tissue and immune responses.
Executive Industry Relevance
This two-vessel occlusion mouse model provides a reliable platform for investigating cerebral ischemia-reperfusion pathophysiology, enabling preclinical evaluation of stroke therapeutics. The model supports immune response and neuronal recovery studies during reperfusion, informing target validation and mechanistic de-risking in neuroprotective drug development. Stable infarct volume and low mortality enhance reproducibility for cross-functional screening campaigns.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of therapeutic hypotheses related to ischemic injury and reperfusion pathways.
- Operational Value: Provides a disease-relevant system for functional target validation in stroke models.
- Predictive Value: Supports preclinical model selection by linking infarct volume to behavioral deficits and immune infiltration.
Screening & Assay Development
- Assay Readiness: Generates quantifiable infarct volume and immune cell infiltration metrics for compound screening.
- Reproducibility: Stable infarct size across animals supports standardized assay conditions and data comparability.
- Scalability: Surgical procedure allows consistent model generation for medium-throughput preclinical evaluation.
Translational & Preclinical Research
- Disease Relevance: Models human stroke pathophysiology through cortical infarct and peripheral immune cell infiltration.
- Translational Continuity: Links reperfusion duration to neuronal loss and behavioral outcomes, informing therapeutic timing.
- Risk-Adjusted Decisions: Enables evaluation of neuroprotective candidates based on infarct reduction and immune modulation.
Pipeline & Workflow Integration
The model fits within the discovery-to-preclinical continuum, supporting target validation through phenotypic screening and lead identification via infarct and immune readouts.
- Discovery Biology: Facilitates pathway clarification and biological de-risking of stroke-related targets.
- Screening: Delivers quantitative dependent variable measurements (infarct volume, immune infiltration) for compound effect assessment.
- Analytics: Enables statistical analysis of infarct area and behavioral deficits to compare experimental conditions.
- Translational Research: Connects reperfusion duration to cortical neuronal loss, supporting biomarker alignment studies.
- Enterprise Reuse: Establishes a reusable surgical and analytical framework for repeated ischemic injury studies.
Operational & Enterprise Impact
- Scientific Value: Provides predictive confidence in target validation through stable infarct and immune response metrics.
- Operational Value: Ensures reproducibility via standardized ligation, reperfusion, and TTC staining protocols.
- Strategic Value: Improves go/no-go decisions by linking infarct size to functional outcomes and immune activity.
- Portfolio Impact: Supports risk-adjusted prioritization of stroke therapeutics based on mechanistic de-risking data.
Implementation Considerations
- Requires expertise in microsurgical techniques, including distal MCA ligation and craniotomy.
- Dependent on instrumentation such as micro drill, stereo microscope, and laser Doppler for blood flow confirmation.
- Necessitates cross-team standardization of ischemia duration, reperfusion timing, and tissue processing.
- Adaptation considerations include variations in Circle of Willis anatomy affecting infarct consistency.
- Practical limitations include surgical skill dependency and potential MCA damage during hole drilling.
Biopharma FAQs
Why does infarct volume measurement matter for target validation?
Infarct volume quantification via TTC staining enables objective assessment of ischemic injury severity, supporting mechanistic de-risking of neuroprotective candidates by linking target engagement to tissue preservation.
How does immune cell infiltration analysis fit the discovery pipeline?
Peripheral immune cell infiltration in the ischemic brain provides a phenotypic readout for screening immunomodulatory compounds, enabling target validation in neuroinflammation pathways relevant to stroke recovery.
What quantitative dependent variable measurements enable lead identification?
Infarct volume, neuronal loss in cortical areas, and locomotor activity deficits serve as quantitative endpoints to compare compound effects, supporting lead identification through reproducible, data-driven efficacy assessment.
Why do replication requirements matter for cross-functional collaboration?
Low mortality and stable infarct size ensure reproducible results across experiments, allowing discovery, preclinical, and translational teams to compare data confidently and advance candidates based on consistent phenotypic outcomes.
What statistical analysis capabilities are required before implementation?
ImageJ-based infarct area measurement, ROI management, and section thickness correction are required to calculate total infarction volume, enabling statistical comparison of ischemia-reperfusion outcomes across experimental groups.
Chapters in this video
0:04
Title
0:58
Middle Cerebral Artery Occlusion (MCAO)/Reperfusion Model
3:48
Staining with 2,3,5-triphenyltetrazolium Chloride
5:03
Infarct Size Measurement and Statistical Analysis
6:09
Results: Analysis of Mouse Brain after Ischemia-induced Infarct
6:52
Conclusion
