PET imaging of brain acetylcholinesterase using [11C]CP-126,998, a brain selective enzyme inhibitor

B. Bencherif, C. J. Endres, J. L. Musachio, A. Villalobos, J. Hilton, U. Scheffel, R. F. Dannals, S. Williams, J. J. Frost

Research output: Contribution to journalArticlepeer-review


PET and [11C]CP-126,998, an N-benzylpiperidinebenzisoxazole, were used to image brain acetylcholinesterase (AChE) distribution in healthy controls before and after administration of 5 mg donepezil p.o., a reversible AChE inhibitor. Logan plots were used to compute distribution volumes (VT). The VT of [11C]CP-126,998 was highest in the basal ganglia and cerebellum and lowest in the cerebral cortex, thalamus, amygdala, and hippocampus. The regional VT values correlated well with AChE concentration measured in vitro. Donepezil, given 4 h before PET scanning, induced a substantial inhibition of [11C]CP-126,998 binding (43-62%) in all brain regions when compared to the baseline PET study. The results of this study indicate that PET imaging of [11C]CP-126,998 may be useful in quantifying the distribution of regional brain AChE. This new PET radiotracer may potentially be employed in the diagnosis and treatment of patients with disorders of cholinergic neurotransmission, such as Alzheimer's disease.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
Issue number1
StatePublished - 2002


  • Acetylcholinesterase inhibitors
  • Alzheimer's disease
  • CP-126,998
  • Donepezil
  • PET

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience


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