α2δ-1 contributes to spatial learning and memory.
A, mean changes show the effect of gabapentin (100 mg/kg, intraperitoneally) on the correct alternation of mice subjected to the T-maze test over 5 consecutive days (n = 10 mice in each group). A schematic diagram of the T-maze test is shown at the top. B, mean changes show the effect of α2δ-1Tat peptide (200 pmol, 200 nl) microinjected into the dorsomedial striatum on the correct alternation of mice subjected to the T-maze test over 5 consecutive days (n = 7 mice in the control peptide group; n = 8 mice in the α2δ-1Tat peptide group). C, mean changes of correct alternation in WT and Cacna2d1-knockout (KO) mice subjected to the T-maze test over 5 consecutive days (n = 13 mice in each group). The data are means ± S.E. *, p < 0.05; **p < 0.01 (versus respective values on day 1); #, p < 0.05; ##, p < 0.01 (versus respective values on the same day in the saline, control peptide, or WT group). Two-way ANOVA analysis followed by Tukey's post hoc test was used.