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Selective platelet deposition during focal cerebral ischemia in cats
J J Jafar1, R Menoni, H Feinberg
1Department of Neurosurgery, University of Illinois, Chicago.
Insights
Platelet deposition occurs in the brain
Area of Science:
- Neuroscience
- Hematology
- Cerebrovascular Research
Background:
- Platelet deposition in microcirculation is implicated in focal cerebral ischemia.
- Understanding platelet behavior during ischemia is crucial for developing treatments.
Purpose of the Study:
- To investigate platelet deposition in specific brain regions following temporary middle cerebral artery occlusion in cats.
Main Methods:
- Cats received radiolabeled platelets and erythrocytes.
- Middle cerebral artery occlusion was induced for 3 hours with reduced blood pressure.
- Brain sections were analyzed post-reperfusion for platelet distribution.
Main Results:
- Selective platelet deposition was observed in the territory of the occluded artery.
- Significant deposition occurred in the caudate nucleus, internal capsule, parietal cortex, and centrum semiovale.
Conclusions:
- Platelets are deposited in the microvasculature during temporary severe focal cerebral ischemia.
- This study supports the role of platelets in the pathophysiology of ischemic stroke.
Abstract:
Platelet deposition in the microcirculation may play a role in focal cerebral ischemia. We investigated platelet deposition in selected parts of the cat brain after temporary middle cerebral artery occlusion. Ten anesthesized cats were given autologous indium-111-labeled platelets and chromium-51-labeled erythrocytes. The right middle cerebral artery was occluded with miniature aneurysm clips for 3 hours via a transorbital approach; blood pressure was reduced concomitantly to decrease the collateral circulation. Removal of the clips initiated a 45-minute period of normotensive reperfusion. After sacrifice, the brain was removed and sectioned for comparison of right- versus left-hemisphere platelet deposition. Platelets were selectively deposited in the territory of the occluded right middle cerebral artery. Significant deposition was found in the caudate nucleus, internal capsule, parietal cortex, and the centrum semiovale. Our findings support the evidence that platelets are deposited in the microvasculature during temporary severe focal cerebral ischemia.