H. Shinotoh et al., Effect of donepezil on brain acetylcholinesterase activity in patients with AD measured by PET, NEUROLOGY, 56(3), 2001, pp. 408-410
Acetylcholinesterase (AChE) activities in the brain of three patients with
AD were measured once before and once during donepezil treatment (5 mg/d in
two patients, 3 mg/d in one patient) using PET and N-[C-11]methylpiperidin
-4-yl acetate. Donepezil reduced k(3) values, an index of AChE activity, in
the cerebral cortex by 39 +/- 5%. All patients showed some degree of sympt
omatic improvement, and it was concluded that this improvement was likely c
aused by improved cholinergic activity by inhibition of AChE in the brain.