Donepezil- and scopolamine-induced rCMRglu changes assessed by PET in conscious rhesus monkeys

Annals of Nuclear Medicine
Makoto AsaiShintaro Nishimura

Abstract

[(18)F]Fluoro-2-deoxyglucose positron emission tomography (FDG-PET) is a useful tool for measuring the regional cerebral metabolic rate of glucose (rCMRglu), which is an index of neuronal activity. Donepezil, an acetylcholine esterase inhibitor (AChEI), has been recommended as a treatment option for patients with Alzheimer's disease (AD). We aimed to characterize the effects of donepezil on rCMRglu using FDG-PET in non-human primates. We investigated the effects of administration of donepezil (500 microg/kg, i.m.), the non-selective muscarinic ACh receptor antagonist scopolamine (30 microg/kg, i.m.), and the coadministration of both drugs on the rCMRglu of conscious young rhesus monkeys. Donepezil increased the rCMRglu in all regions of interest except in the thalamus. Scopolamine treatment also increased the rCMRglu in all regions of interest except the cerebellum and thalamus. However, these effects disappeared with coadministration of the drugs. This PET study showed that administration of donepezil or scopolamine alone increased the rCMRglu in conscious rhesus monkeys. We also found that the donepezil-induced increase was abolished by simultaneous administration of scopolamine, suggesting that muscarinic ACh receptor functi...Continue Reading

References

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Citations

Aug 30, 2011·Neurología : publicación oficial de la Sociedad Española de Neurología·A ToledanoC I Fernández-Verdecia
Sep 6, 2013·British Journal of Pharmacology·Russell H Swerdlow
May 21, 2013·NeuroImage·O M DoyleA F Marquand

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