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Effects of donepezil on cortical metabolic response to activation during 18FDG-PET in Alzheimer’s disease: a double-blind cross-over trial

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Abstract

Rationale

Cholinergic enhancement is among the best established treatments of Alzheimer’s disease (AD). The cognitive effects of treatment are thought to be mediated by improvement of neuronal transmission. Positron emission tomography using (18)F-fluorodeoxyglucose (FDG-PET) by measuring cortical metabolic response to activation assesses integrity of neuronal transmission in vivo.

Objective

To determine the effects of treatment with donepezil, a centrally selective acetylcholinesterase inhibitor, on cortical metabolism in AD using (18)FDG-PET.

Methods

We enrolled 23 patients, 18 of which completed the study, with mild to moderate probable AD (mini-mental status exam scores of 15–28, inclusive) in a double-blind cross over trial of 8 weeks donepezil compared to 8 weeks placebo with repeated double (18)FDG-PET examinations during passive audio-visual stimulation. Effects of treatment on cortical metabolic response to stimulation were determined with a linear model on a voxel level using Statistical Parametric Mapping (SPM 99, Wellcome Department of Imaging Neuroscience, London).

Results

Effects of treatment on cognitive measures were not different between donepezil and placebo. During passive audio-visual stimulation, patients showed activation in posterior visual and auditory areas and decreased activation in frontal cortex and basal ganglia. Resting state metabolism was increased with donepezil in left prefrontal cortex and decreased in right hippocampus. Cortical response to activation was increased in right hippocampus with donepezil compared to placebo.

Conclusion

Donepezil treatment shows a spatially limited functional effect on right hippocampus and left prefrontal cortical metabolism, independently of clinical response to treatment.

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Acknowledgements

We thank Felician Iancu, Christine Sänger, Bea Riemenschneider and Monika Merrath (Department of Psychiatry, LMU Munich) and the staff of the Department of Nuclear Medicine (TU Munich) for technical assistance. We thank Dr. Michael Ewers (Department of Psychiatry, LMU Munich) for critical reading of the manuscript. This study was supported by a grant of Eisai/Pfizer (Frankfurt, Karlsruhe, Germany) to H.H. and S.J.T.

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Authors and Affiliations

  1. Alzheimer Memorial Center, Department of Psychiatry, Ludwig-Maximilian University, Nussbaumstr. 7, 80336, Munich, Germany

    Stefan J. Teipel, Hans-Jürgen Möller & Harald Hampel

  2. Department of Nuclear Medicine, Technical University, Munich, Germany

    Alexander Drzezga & Markus Schwaiger

  3. Department of Nuclear Medicine, University of Mainz, Mainz, Germany

    Peter Bartenstein

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  1. Stefan J. Teipel
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  2. Alexander Drzezga
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  3. Peter Bartenstein
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  4. Hans-Jürgen Möller
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  6. Harald Hampel
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Correspondence to Stefan J. Teipel.

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Teipel, S.J., Drzezga, A., Bartenstein, P. et al. Effects of donepezil on cortical metabolic response to activation during 18FDG-PET in Alzheimer’s disease: a double-blind cross-over trial. Psychopharmacology 187, 86–94 (2006). https://doi.org/10.1007/s00213-006-0408-1

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  • DOI: https://doi.org/10.1007/s00213-006-0408-1

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