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- W2051034548 abstract "Vasoactive intestinal peptide (VIP) is a neuropeptide present in high concentrations in the hippocampus. The studies reported here demonstrate that VIP administered into the third ventricle of the brain caused amnesia in mice trained on a left-right footshock avoidance task in a T-maze. VIP resulted in amnesia when administered directly into the rostral portion of the hippocampus at a 10-fold lower dose than was needed to produce amnesia when VIP was administered intracerebroventricularly. When VIP was administered 24 hr after training, it failed to impair retention measured a week later. VIP receptor antagonist ([4-Cl-D-Phe6,Leu17]VIP) enhanced retention when administered into the rostral portion of the hippocampus, suggesting that VIP plays a physiological role in memory modulation. VIP receptor antagonist administered 24 hr after training did not facilitate retention. To gain some insight as to how VIP may be affecting memory processing, we determined if some memory-improving compounds showed a selective ability to block amnesia induced by VIP. The amnestic effect of VIP was blocked by peripheral administration of the memory-enhancing agents, arecoline, naloxone and ST 587 (a noradrenergic receptor agonist) but not by cholecystokinin octapeptide. Central administration of arecoline, but not neuropepide Y, blocked the amnestic effect of VIP. It is concluded that VIP is a potent amnestic peptide." @default.
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- W2051034548 date "1990-09-01" @default.
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- W2051034548 title "Vasoactive intestinal peptide (VIP): An amnestic neuropeptide" @default.
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- W2051034548 doi "https://doi.org/10.1016/0196-9781(90)90012-t" @default.
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