(A) The effect of 40-min perfusion of 1 μM
scopolamine on ACh release in the hippocampus of wild-type and mutant
animals at 4 months of age was studied. No significant differences in
stimulated extracellular ACh levels were noted in the wild-type and
mutant groups (n = 6). In both groups, the released
ACh slowly returned to the basal values within 80–100 min.
(B) In the 10-month-old animals, scopolamine-evoked ACh
release was significantly attenuated in the mutants compared with
wild-type age-matched controls (t test,
**P < 0.01; n = 5).
(C) Similarly, the area under the curve (AUC 0–120 min)
values was not significantly different between the genotypes at 4
months of age but was reduced by 47% in the 10-month-old animals
(t test, **P < 0.01;
n = 5).