Boc-Tyr(SO3)-Nle-Gly-Trp-Nle-Asp-2-phenylether ester (CCK-JMV-180) has been reported to be a CCK-based heptipeptide with novel in vitro properties. Based on studies conducted in rat and mouse pancreatic acini, it has been proposed that the compound acts as an agonist at the high-affinity site and an antagonist at the low-affinity site in the rat, but as an agonist at both sites in the mouse. In the present study, we examined the effects of CCK-JMV-180 on locomotor activity in the rat and on intake of a liquid diet in the rat and mouse. Although CCK-JMV-180 slightly reduced activity on its own in the rat, it completely reversed the suppression produced by coadministration of CCK-8. In rat feeding studies, CCK-JMV-180 failed to suppress intakes of a liquid diet, but was able to antagonize the anorectic effects of CCK-8. In contrast, in the mouse CCK-JMV-180 potently suppressed intakes on its own, and this effect was blocked by pretreatment with the selective CCK-A receptor antagonist, A-70104. The results of these studies suggest that similar receptor mechanisms are involved in CCK's ability to inhibit food intake in vivo and its effects on pancreatic function in vitro.
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