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A potent and selective NPY Y5 antagonist reduces food intake but not through blockade of the NPY Y5 receptor

International Journal of Obesity volume 28, pages 628–639 (2004)Cite this article

Abstract

AIM: These studies were performed to test the hypothesis that endogenous neuropeptide Y (NPY) acting on the NPY Y5 receptor subtype contributes to the control of food intake. The hypothesis was tested using S 25585—a newly synthesized NPY Y5 receptor antagonist.

METHODS AND RESULTS: S 25585 was shown to be a high-affinity antagonist of the NPY Y5 receptor subtype (IC50 5 nM) with no significant affinity toward other NPY receptor subtypes and over 40 other receptors, channels or uptake systems. S 25585 (7.5 mg/kg, i.p.) did not induce a conditioned taste aversion, significantly alter need-induced sodium appetite or induce pica, suggesting that at this dose the compound did not induce illness or malaise. In satiated rats, S 25585 (5.0 and 7.5 mg/kg, i.p.) significantly decreased the overfeeding induced by i.c.v. injection of NPY (1 μg) and the highly selective NPY Y5 receptor agonist [hPP1−17, Ala31, Aib32]NPY (0.7 μg). In rats fasted for 4 h immediately before the dark phase, analysis of the microstructure of feeding behavior revealed that S 25585 significantly increased latency to eat and significantly decreased the duration and size of the meals without altering the meal number or eating rate. Analysis of the behavioral satiety sequence at this time revealed that the animals passed through the normal pattern of feeding, grooming and resting. Although S 25585 appeared to be influencing a physiological system controlling appetite, this does not involve the NPY Y5 receptor since the antagonist also markedly reduced food intake in the NPY Y5 knockout mouse.

CONCLUSIONS: The results presented do not support a role for the NPY Y5 receptor in the control of food intake. The results further illustrate that it is imperative that the activity of any new NPY Y5 antagonist be assessed in the NPY Y5 knockout mouse before assuming that its effect on food intake is due to blockade of this receptor.

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Author notes

  1. N Levens

    Present address: Head of Biology, Biovitrum AB Stockholm, Sweden

Authors and Affiliations

  1. Metabolic Diseases, Servier Research Institute, Suresnes, France

    O Della-Zuana, L Revereault, S Chamorro, M Félétou & N Levens

  2. Biochemistry Instititute, University of Leipzig, Leipzig, Germany

    A Beck-Sickinger

  3. Department of Organic Pharmaceutical Chemistry, University of Navarra, Pamplona, Spain

    A Monge

  4. Servier External Research, Courbevoie, France

    D-H Caignard

  5. Chemistry, Servier Research Institute, Croissy-sur-Seine, France

    J-L Fauchère & J-M Henlin

  6. Molecular & Cellular Pharmacology, Servier Research Institute, Croissy-sur-Seine, France

    V Audinot & J A Boutin

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Correspondence to O Della-Zuana.

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Della-Zuana, O., Revereault, L., Beck-Sickinger, A. et al. A potent and selective NPY Y5 antagonist reduces food intake but not through blockade of the NPY Y5 receptor. Int J Obes 28, 628–639 (2004). https://doi.org/10.1038/sj.ijo.0802435

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