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Changes in cholinergic neurons and failure in learning function after microsphere embolism-induced cerebral ischemia
N Takagi1, K Miyake, T Taguchi
1Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Hachioji, Japan.
Brain Research Bulletin
|January 1, 1997
Summary
Microsphere embolism impaired learning and memory in rats by damaging central cholinergic neurons. This damage reduced acetylcholine levels and choline acetyltransferase activity in the brain.
Area of Science:
- Neuroscience
- Pathology
- Biochemistry
Background:
- Central cholinergic neurons are crucial for learning and memory.
- Understanding the impact of ischemic events on these neurons is vital.
Purpose of the Study:
- To investigate pathological changes in learning and acetylcholine metabolism after microsphere embolism in rats.
- To assess the effects on the cerebral cortex and hippocampus.
Main Methods:
- Induction of microsphere embolism in the rat's right internal carotid artery.
- Assessment of learning function using a passive avoidance task.
- Biochemical analysis of acetylcholine, choline, and choline acetyltransferase activity.
- Histochemical quantification of acetylcholinesterase-containing fibers.
Main Results:
- Microsphere embolism led to impaired passive avoidance learning.
- Significant decrease in acetylcholine concentration and choline acetyltransferase activity in the cortex and hippocampus.
- Reduced length of acetylcholinesterase-containing fibers in the ipsilateral hemisphere.
Conclusions:
- Microsphere embolism causes substantial damage to cholinergic neurons.
- This damage is strongly associated with impaired learning function in the ischemic brain.