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A Preclinical Model to Assess Brain Recovery After Acute Stroke in Rats
Published on: November 6, 2019
Long-term behavioral assessment of function in an experimental model for ischemic stroke
Angelo Encarnacion1, Nobutaka Horie, Hadar Keren-Gill
1Behavioral and Functional Neuroscience Laboratory, Stanford Institute for Neuro-Innovation and Translational Neurosciences, Stanford University School of Medicine, United States.
Journal of Neuroscience Methods
|January 25, 2011
Summary
Long-term assessment of stroke models in rats reveals reliable behavioral tests for evaluating therapeutic candidates. This study identifies optimal experimental paradigms for preclinical stroke research, avoiding false positives from short-term evaluations.
Area of Science:
- Neuroscience
- Translational Medicine
- Animal Models
Background:
- Middle cerebral artery occlusion (MCAO) in rats is a key model for ischemic stroke research.
- Short-term functional outcome assessments in preclinical stroke studies can yield misleading results, leading to false positives.
- There is a need for robust experimental paradigms to accurately assess long-term recovery and therapeutic efficacy in stroke models.
Purpose of the Study:
- To evaluate long-term functional deficits (90 days) after MCAO in Sprague-Dawley and Wistar rats.
- To compare the effects of two ischemic insult durations on infarction volume and functional recovery.
- To identify the most suitable experimental paradigm for assessing injury and recovery in preclinical stroke research.
Main Methods:
- MCAO was induced in Sprague-Dawley and Wistar rats with varying occlusion durations.
- Behavioral outcomes were assessed weekly for 90 days post-stroke using multiple tests (e.g., neuroscores, CatWalk, limb asymmetry).
- Brain lesions were evaluated post-mortem to correlate with behavioral deficits.
Main Results:
- Infarction volume correlated with occlusion duration in Sprague-Dawley rats but not Wistar rats.
- Functional deficits, including limb asymmetry and gait coordination, were detectable long-term (90 days) in both strains.
- Occlusion duration did not significantly impact long-term functional outcomes across strains.
Conclusions:
- Extended long-term assessment (90 days) is crucial for reliable evaluation of stroke treatments in preclinical models.
- Specific behavioral assays (limb asymmetry, neuroscores, gait analysis) are effective for long-term outcome measurement.
- This study provides a validated experimental paradigm for screening therapeutic candidates in ischemic stroke research.
