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Updated: Jan 2, 2026
Focal Cerebral Ischemia Model by Endovascular Suture Occlusion of the Middle Cerebral Artery in the Rat
Published on: February 5, 2011
Microcirculatory Obstruction in Focal Cerebral Ischemia: An Electron Microscopic Investigation in Monkeys
John R. Little1, Frederick W.L. Kerr1, Thoralf M. Sundt1
1From the Cerebrovascular Clinical Research Center and the Department of Neurologic Surgery, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55901.
Abstract:
The fine structure of the microvasculature in areas of focal cerebral ischemia was studied in squirrel monkeys and the changes in areas of impaired and unimpaired microvascular filling, as defined by carbon perfusion, were compared. Microcirculatory obstruction became evident three hours following middle cerebral artery (MCA) occlusion and appeared to be partly the result of compression of capillaries by perivascular glial swelling and developing cerebral edema. Slight endothelial swelling was a common finding. Intraluminal membrane-bound bodies were occasionally identified but they did not appear to be producing significant obstruction. The tight endothelial junctions remained intact and there was no evidence of accelerated micropinocytosis. Severe neuronal injury frequently preceded the development of the microvascular obstruction and was more widespread than the zones of impaired perfusion.
Insights
Cerebral ischemia in squirrel monkeys shows microvascular obstruction within three hours of middle cerebral artery occlusion. This obstruction is mainly due to glial swelling and edema, not endothelial damage.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Pathology
Background:
- Focal cerebral ischemia disrupts brain microcirculation.
- Understanding microvascular changes is crucial for stroke treatment.
Purpose of the Study:
- To investigate the fine structure of microvasculature in focal cerebral ischemia.
- To compare microvascular filling in impaired and unimpaired areas.
Main Methods:
- Studied microvasculature fine structure in squirrel monkeys.
- Used carbon perfusion to define areas of impaired and unimpaired microvascular filling.
- Examined changes three hours after middle cerebral artery occlusion.
Main Results:
- Microcirculatory obstruction observed three hours post-middle cerebral artery occlusion.
- Obstruction linked to perivascular glial swelling and cerebral edema.
- Endothelial swelling was common; tight junctions remained intact.
- Neuronal injury often preceded microvascular obstruction.
Conclusions:
- Microvascular obstruction in focal cerebral ischemia is primarily caused by edema and glial swelling.
- Endothelial integrity is largely maintained initially.
- Neuronal damage is a significant factor preceding microvascular impairment.
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