Pharmacological properties of ceruletide in the vertical and horizontal locomotor activities of mice

Behavioral effects of the cyclic cholecystokinin peptide analogue JMV-320

The in vivo effects of JMV-320 (a highly selective CCKB receptor ligand) and of CCK-4 on exploratory activity and memory in rats were compared. JMV-320 and CCK-4 did not modulate exploratory activity in an open field test but decreased it in an elevated plus-maze. CCK-4 (50 micrograms/kg) impaired passive avoidance response 3 h after training and JMV-320 (1 and 10 micrograms/kg) decreased active avoidance response 24 h after training. The behavioral effects of JMV-320 resemble the effects of CCK-4 and suggest that in vivo JMV-320 acts as a CCKB receptor agonist.

Behavioural effects of two cholecystokinin analogues: JMV 236 and JMV 179

The behavioural effects of two cholecystokinin analogues Boc-Tyr(SO3H)-Nle-Gly-Trp-Nle-Asp-Phe-NH2 (JMV 236), a potent CCK agonist, and Boc-Tyr(SO3H)-Nle-Gly-DTrp-Nle-Asp-2-Phenylethylester (JMV 179), a CCK antagonist were studied. JMV 236 (3.125, 12.5 and 50 micrograms/kg i.p.) dose-dependently decreased the exploratory activity of rats, the effect being significant for horizontal activity (ambulation) at doses of 12.5 and 50 micrograms/kg and for vertical activity (rearing) at a dose of 50 micrograms/kg. JMV 179 (3.125, 12.5 and 50 micrograms/kg i.p.) did not change the horizontal activity but dose-dependently decreased the vertical activity, the effect being significant at a dose of 50 micrograms/kg. JMV 236 administered immediately after training significantly facilitated short-term memory in passive avoidance situation but only tended to increase the mean latency upon retention testing on the 7th day. JMV 179 tended to increase the latency of the passive avoidance response upon retention testing at the 24th hour but not on the 7th day after training.