(A) Acute suppression of γ-secretase activity by one-day DAPT treatment at Day 37–42 has no detectable effect on evoked EPSCs (left, representative traces; right, summary graphs of evoked EPSC amplitudes and charge transfer).
(B) Semi-acute suppression of γ-secretase activity by two-day DAPT treatment at Day 37–42 significantly decreases synaptic strength as monitored via evoked EPSCs (left, representative traces; right, summary graphs of evoked EPSC amplitudes and charge transfer).
(C) Acute suppression of γ-secretase activity by a one-day DAPT treatment at Day 20, analyzed on Day 21, has no significant effect on evoked EPSCs (left, representative traces; right, summary graphs of evoked EPSC amplitudes and charge transfer).
Data are means +/− SEM; numbers of cells/replicates are indicated in the bars. Statistical analyses were performed using two-tailed unpaired t-test, with * = p<0.05; ** = p<0.01, *** = p<0.001. For kinetics and intrinsic properties, see Figure S5.