RT Journal Article SR Electronic T1 3-[5-(3,4-Dichloro-phenyl)-1-(4-methoxy-phenyl)-1H-pyrazol-3-yl]-2-m-tolyl-propionate (JNJ-17156516), a Novel, Potent, and Selective Cholecystokinin 1 Receptor Antagonist: In Vitro and in Vivo Pharmacological Comparison with Dexloxiglumide JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 562 OP 569 DO 10.1124/jpet.107.124578 VO 323 IS 2 A1 Magda F. Morton A1 Terrance D. Barrett A1 Wen Yan A1 Jamie M. Freedman A1 Guy Lagaud A1 Clodagh E. Prendergast A1 Veronica Moreno A1 Jayashree Pyati A1 Katherine Figueroa A1 Lina Li A1 Xiaodong Wu A1 Michele Rizzolio A1 James G. Breitenbucher A1 Kelly McClure A1 Nigel P. Shankley YR 2007 UL http://jpet.aspetjournals.org/content/323/2/562.abstract AB 3-[5-(3,4-Dichloro-phenyl)-1-(4-methoxy-phenyl)-1H-pyrazol-3-yl]-2-m-tolyl-propionate (JNJ-17156516) is a novel, potent, and selective cholecystokinin (CCK)1-receptor antagonist. In this study, the pharmacology of JNJ-17156516 was investigated both in vitro and in vivo, and the pharmacokinetic profile was evaluated in rats. JNJ-17156516 expressed high-affinity at the cloned human (pKI = 7.96 ± 0.11), rat (pKI = 8.02 ± 0.11), and canine (pKI = 7.98 ± 0.04) CCK1 receptors, and it was also highly selective for the CCK1 receptor compared with the CCK2 receptor across the same species (∼160-, ∼230-, and ∼75-fold, respectively). The high affinity of JNJ-17156516 at CCK1 receptors in vitro was confirmed in radioligand binding studies on fresh human gallbladder tissue (pKI = 8.22 ± 0.05). In a functional in vitro assay of guinea pig gallbladder contraction, JNJ-17156516 behaved as a competitive antagonist, with apKB value of 8.00 ± 0.07. In vivo, JNJ-17156516 produced a parallel, rightward shift in the CCK-8S-evoked contraction of the guinea pig gallbladder. The dose required to shift the CCK-8S dose-response curve was 240 nmol kg–1 i.v. In the anesthetized rat, JNJ-17156516 produced a dose-related decrease in the number of duodenal contractions evoked by infusion of CCK-8S, with an ED50 = 484 nmol kg–1. Pharmacokinetic analysis of JNJ-17156516 in rats, revealed that JNJ-17156516 had a half-life of 3.0 ± 0.5 h and a very high bioavailability (108 ± 10%) in this species. Overall, we have demonstrated that JNJ-17156516 is a high-affinity selective human CCK1 receptor antagonist with good pharmacokinetic properties in rats. The American Society for Pharmacology and Experimental Therapeutics