Abstract:
:Our previous study demonstrated that permanent two-vessel occlusion (2VO)-induced working memory deficit was improved by daily administration of tacrine, a cholinesterase inhibitor. In this study, we investigated the mechanism underlying the effects of tacrine in 2VO rats using the eight-arm radial maze task. Daily administration of tacrine (0.1 or 0.3 mg/kg i.p.) started 5 weeks after the 2VO operation significantly improved the maze performance. In the delay-interposition task, a significant impairment of maze performance was observed in the tacrine (0.3 mg/kg, i.p.)-treated rats at a delay of 90 min but not delays of 5 or 30 min. Sham-operated rats were not affected by delay. After leaving animals with no further treatment for 4 weeks, the tacrine-pretreated 2VO rats showed significantly impaired performance compared to the sham-operated control animals. However, the performance of the tacrine-pretreated 2VO rats was significantly improved by restarting the daily administration of tacrine (0.3 mg/kg, i.p.). The effect of tacrine was reversed by the muscarinic antagonist scopolamine and the selective M1 antagonist pirenzepine. Moreover, a microdialysis study revealed that tacrine (1 or 3 mg/kg, i.p.) increased the extracellular acetylcholine (ACh) level for a period of over 3 h in the cerebral cortex of 2VO rats. These findings suggest that the ameliorative effect of tacrine on the spatial memory deficit in 2VO rats is reversible and may be mediated by stimulating the muscarinic M1 receptor via elevation of the extracellular ACh level in the brain.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Murakami Y,Ikenoya M,Matsumoto K,Li H,Watanabe Hdoi
10.1016/s0166-4328(99)00162-xsubject
Has Abstractpub_date
2000-04-01 00:00:00pages
83-90issue
1eissn
0166-4328issn
1872-7549pii
S0166-4328(99)00162-Xjournal_volume
109pub_type
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