Regulation of AMPA receptor phosphorylation by serotonin (100
μM) in vitro. The amounts of phospho-Ser-831–GluR1
(Left) and phospho-Ser-845–GluR1 (Right)
in extracts of slices from WT (black bars) and DARPP-32 KO (white bars)
mice were quantified by densitometry. Data represents means ± SE
for three to ten experiments. *, P < 0.05,
**, P < 0.01,
***, P < 0.001 compared with
control; #, P < 0.05, ##, P <
0.01 compared with serotonin in WT, Student's t test.