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The Effect of RFamide-Related Peptide-3 (RFRP-3 or NPVF) on Food Intake in Neonatal Chickens: The Role of MC3/MC4 and CRF1/CRF2 Receptors

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Abstract

RFamide-related Peptide-3(RFRP-3) plays a key role in appetite regulation. The current study aimed to determine the effect of RFRP-3(Neuropeptide VF) on feeding behavior and its interaction with the melanocortin and corticotropin systems on food intake in the neonatal broiler-type chickens. In experiments 1 and 2, chickens received intracerebroventricular (ICV) injection of control solution besides RFRP-3 (4, 8, and 16 nmol) and RF9 (NPFF receptors antagonist; 4, 8 and 16 nmol) respectively to investigate the effective doses of RFRP-3 and RF9. Experiments 3–8 have been designed to investigate the mediatory role of CRF1/CRF2 and MC3R/MC4R on food intake induced by RFRP-3 in chickens. Finally, in experiments 8–11, the synergistic effect between the MC3R and MC4R with RFRP-3 have been investigated via ICV co-injection of sub-effective doses of RFRP-3 + γ1-MSH and PG-931. Then, cumulative food intake was recorded at 30, 60, and 120 min after injection. According to the results, co-injection of astressin-B and RFRP-3, significantly attenuated hypophagic effect of RFRP-3; while astressin2-B reversed this effect of RFRP-3 (p < 0.01). Besides, co-administration of SHU9119 and MCL0020 significantly attenuated the hypophagia induced by RFRP-3 in chickens (p < 0.01). However, co-administration of RFRP-3 and PG-931 synergistically decreased food intake in neonatal chicken (p < 0.01). These results suggested hypophagic effect of RFRP-3 is possibly mediated via corticotropin CRF2 and melanocortin MC4R in neonatal broiler chickens.

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Acknowledgements

The authors thank the central laboratory (Dr. Rastegar Lab.) of the Faculty of Veterinary Medicine, the University of Tehran for cooperation. This research is conducted as a part of the Ph.D. thesis of the first author.

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Correspondence to Morteza Zendehdel.

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This manuscript does not contain any studies with human subjects performed by any of the authors. All experiments were executed according to the Guide for the Care and Use of Laboratory Animals and were approved by the institutional animal ethics committee.

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Moosadoost, Y., Zendehdel, M. & Khodadadi, M. The Effect of RFamide-Related Peptide-3 (RFRP-3 or NPVF) on Food Intake in Neonatal Chickens: The Role of MC3/MC4 and CRF1/CRF2 Receptors. Int J Pept Res Ther 27, 253–262 (2021). https://doi.org/10.1007/s10989-020-10081-z

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  • DOI: https://doi.org/10.1007/s10989-020-10081-z

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