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J Med Chem. 2007 Nov 15;50(23):5790-806. Epub 2007 Oct 10.

Toward potent ghrelin receptor ligands based on trisubstituted 1,2,4-triazole structure. 2. Synthesis and pharmacological in vitro and in vivo evaluations.

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  • 1Institut des Biomolécules Max Mousseron, UMR 5247, CNRS, Université Montpellier I et Université Montpellier II, BP 14491, Faculté de Pharmacie, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.


A series of ghrelin receptor ligands based on the trisubstituted 1,2,4-triazole structure were synthesized and evaluated for their in vitro binding and biological activity. In this study, we explored the significance of the aminoisobutyryl (Aib) moiety, a common feature in numerous growth hormone secretagogues described in the literature. Potent agonist and antagonist ligands of the growth hormone secretagogue receptor type 1a (GHS-R1a) were obtained, i.e., compounds 41 (JMV2894) and 17 (JMV3031). The best compounds were evaluated for their in vivo activity on food intake, after sc injection in rodents. Among the tested compounds, few of them were able to stimulate food intake and some others, i.e., compounds 4 (JMV2959), 17, and 52 (JMV3021), acted as potent in vivo antagonist of hexarelin-stimulated food intake. These compounds did not stimulate growth hormone secretion in rats and furthermore did not antagonize growth hormone secretion induced by hexarelin, revealing that it is possible to modulate food intake without altering growth hormone secretion.

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