I.c.v. infusion of RVD or VD impairs memory of normal mice.
In Aβ-treated mice, i.c.v. infusion of RVD or VD improves memory impaired by Aβ.
The above effect of RVD and VD could be inhibited by Hp or AM251.
I.c.v. infusion of Hp improves memory of normal mice.
The above effect of Hp could be prevented by RVD, VD or WIN55, 212-2.