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Updated: Oct 4, 2026
Endothelin-1 Induced Middle Cerebral Artery Occlusion Model for Ischemic Stroke with Laser Doppler Flowmetry Guidance in Rat
Published on: February 16, 2013
A serial MR study of cerebral blood flow changes and lesion development following endothelin-1-induced ischemia in
J Biernaskie1, D Corbett, J Peeling
1Division of Basic Medical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Newfoundland, Canada.
Abstract:
The vasoconstrictive peptide endothelin-1 (ET-1) has been used previously to transiently occlude the middle cerebral artery (MCA) in rats. However, the duration of the resulting reduction in cerebral blood flow (CBF) and the reperfusion characteristics are poorly understood. In this study perfusion and T(2)-weighted MRI were used together with histology to characterize the cerebral perfusion dynamics and lesion development following ET-1 injection. Twenty-two rats received an intracerebral injection of ET-1 adjacent to the MCA. CBF was reduced to 30-50% of control levels, and a significant reduction persisted for 16 h in the cortex and 7 h in the striatum. The lesion size measured by T(2)-weighted imaging at 48 h correlated with the final infarct size measured by histology at 7 d. The sustained reduction in CBF and the gradual development of the ischemic lesion resemble human stroke evolution, suggesting that this model may be useful for evaluating therapeutic agents, particularly when treatment is delayed.
Insights
Endothelin-1 (ET-1) reduces rat cerebral blood flow (CBF) for hours, causing gradual ischemic lesions. This model mimics human stroke, aiding delayed therapeutic agent evaluation.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Ischemic Stroke Modeling
Background:
- Endothelin-1 (ET-1) is a vasoconstrictive peptide used to occlude the middle cerebral artery (MCA) in rat models.
- The precise duration of reduced cerebral blood flow (CBF) and reperfusion dynamics after ET-1 injection remain poorly characterized.
Purpose of the Study:
- To characterize cerebral perfusion dynamics and ischemic lesion development following ET-1 injection in rats.
- To evaluate the utility of this ET-1 induced stroke model for assessing delayed therapeutic interventions.
Main Methods:
- Intracerebral injection of ET-1 adjacent to the MCA in 22 rats.
- Monitoring of CBF using perfusion imaging.
- Assessment of lesion development using T(2)-weighted MRI and histology.
Main Results:
- ET-1 induced a sustained CBF reduction to 30-50% of control levels.
- Significant CBF reduction persisted for 16 hours in the cortex and 7 hours in the striatum.
- Lesion size on MRI at 48 hours correlated with infarct size on histology at 7 days.
Conclusions:
- The ET-1 rat model demonstrates sustained CBF reduction and gradual ischemic lesion development, mirroring human stroke progression.
- This model is suitable for evaluating therapeutic agents, especially for delayed treatment strategies in stroke.
