Abstract
Prolactin-releasing peptide (PrRP) and its receptor G protein–coupled receptor 10 (GPR10) are expressed in brain areas involved in the processing of nociceptive signals. We investigated the role of this new neuropeptidergic system in GPR10-knockout mice. These mice had higher nociceptive thresholds and stronger stress-induced analgesia than wild-type mice, differences that were suppressed by naloxone treatment. In addition, potentiation of morphine-induced antinociception and reduction of morphine tolerance were observed in mutants. Intracerebroventricular administration of PrRP in wild-type mice promoted hyperalgesia and reversed morphine-induced antinociception. PrRP administration had no effect on GPR10-mutant mice, showing that its effects are mediated by GPR10. Anti-opioid effects of neuropeptide FF were found to require a functional PrRP-GPR10 system. Finally, GPR10 deficiency enhanced the acquisition of morphine-induced conditioned place preference and decreased the severity of naloxone-precipitated morphine withdrawal syndrome. Altogether, our data identify the PrRP-GPR10 system as a new and potent negative modulator of the opioid system.
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Acknowledgements
We thank C. Contet, L. Cuvelier and D. Houtteman for technical assistance and F. Simonin for helpful discussion. M.P. and S.N.S. were supported by the Fondation Médicale Reine Elisabeth and the Fonds de la Recherche Scientifique Médicale. M.P. was also supported by the Belgian 'Interuniversity Attraction Poles' program, initiated by the Belgian State, Prime Minister's Office, Science Policy Programming and the LifeSciHealth (grant LSHB-CT-2003-503337) programs of the European Community. O.V. and R.M. were supported by the Spanish Ministry of Science and Technology (SAF 2001-0745 to O.V. and GEN2003-20651-C06-04 to R.M). P.L. was supported by fellowships from the Fonds pour la Recherche dans l'Industrie et l'Agriculture and Télévie. C.L and A. de K. are Chercheurs Qualifiés of the Fonds National de la Recherche Scientifique. Scientific responsibility is assumed by the authors.
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Supplementary information
Supplementary Fig. 1
Corticosterone supplementation. (PDF 221 kb)
Supplementary Fig. 2
Lower incidence of somatic signs of withdrawal in KO mice. (PDF 240 kb)
Supplementary Fig. 3
Morphine-induced regulation of NPFF and PrRP transcript levels. (PDF 320 kb)
Supplementary Table 1
[35S]GTPγS binding assay of the μ-opioid receptor. (PDF 26 kb)
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Laurent, P., Becker, J., Valverde, O. et al. The prolactin-releasing peptide antagonizes the opioid system through its receptor GPR10. Nat Neurosci 8, 1735–1741 (2005). https://doi.org/10.1038/nn1585
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DOI: https://doi.org/10.1038/nn1585
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