Ischemic Stroke Modeling in Rodent Systems

Rodent models of ischaemic stroke are indispensable tools for dissecting the pathophysiology of cerebral infarction and for preclinical assessment of neuroprotective strategies. The intraluminal filament approach to occlude the middle cerebral artery (MCAO) remains the most widely adopted technique, offering reproducible infarct volumes and an opportunity to study reperfusion injury. Alternatives such as photothrombotic and embolic models permit focal vessel occlusion without surgical craniotomy but may yield smaller penumbral zones. Critical factors influencing experimental outcomes include surgical skill, filament characteristics, animal strain, age and sex. Recent advances in real-time imaging and proteomic profiling have enhanced model refinement, enabling intra-operative monitoring of filament placement and post-ischaemic molecular characterisation. Together, these developments improve reproducibility and translational relevance, informing global efforts to develop effective stroke therapies.

Research from Nature Portfolio

Recent studies have conducted a systematic comparison of two classic intraluminal filament methods. One analysis demonstrated that the Koizumi approach yields shorter operation times, larger infarct volumes and more severe brain oedema, whereas the Zea Longa method offers more consistent cerebral blood flow restoration, higher survival rates and well-defined reperfusion injury, guiding model choice according to study objectives. Another investigation explored reperfusion dynamics, showing that gradual restoration of blood flow markedly reduced infarct ratios, neuronal apoptosis and histopathological damage compared with rapid reperfusion in middle cerebral artery occlusion rats, particularly after prolonged ischaemia. These findings underscore the influence of reperfusion strategy on injury severity and reinforce the value of controlled flow restoration in preclinical trials.

Ischemic Stroke Modeling in Rodent Systems publication trend

The graph below shows the total number of articles in ischemic stroke modeling in rodent systems across all publications each year (not limited to Nature Index journals).

Technical terms

Middle cerebral artery occlusion (MCAO): A surgical technique that transiently or permanently blocks the middle cerebral artery to induce a reproducible ischaemic stroke in rodents.

Ischaemia–reperfusion injury: Tissue damage caused when blood supply returns to the brain after a period of ischaemia, often exacerbated by oxidative stress and inflammation.

Infarct volume: The total volume of brain tissue that undergoes irreversible ischaemic damage following arterial occlusion.

Penumbra: The region of hypoperfused brain tissue surrounding the core infarct that remains viable and is salvageable by timely intervention.

Cerebral blood flow (CBF): The rate of blood supply to brain tissue, critical for delivering oxygen and nutrients and for quantifying the severity of ischaemia.

References

1. Comparative Brain Proteomic Analysis between Sham and Cerebral Ischemia Experimental Groups. International Journal of Molecular Sciences (2024).
2. Distinctions between the Koizumi and Zea Longa methods for middle cerebral artery occlusion (MCAO) model: a systematic review and meta-analysis of rodent data. Scientific Reports (2023).
3. Ischemia Reperfusion Injury after Gradual versus Rapid Flow Restoration for Middle Cerebral Artery Occlusion Rats. Scientific Reports (2018).
4. A Novel Method for Assessing Cerebral Edema, Infarcted Zone and Blood-Brain Barrier Breakdown in a Single Post-stroke Rodent Brain. Frontiers in Neuroscience (2019).
5. Method parameters’ impact on mortality and variability in rat stroke experiments: a meta-analysis. BMC Neuroscience (2013).
6. MRI Guiding of the Middle Cerebral Artery Occlusion in Rats Aimed to Improve Stroke Modeling. Translational Stroke Research (2017).