Abstract
Amylin is a peptide co-secreted with insulin that penetrates into the brain, and produces satiation-like effects via actions in the brainstem, hypothalamus, and mesencephalon. Little is known, however, about the effects of amylin in the nucleus accumbens shell (AcbSh), where a circumscribed zone of intense amylin receptor (AMY-R) binding overlaps reported mappings of a ‘hotspot’ for μ-opioid receptor (μ-OR) amplification of food reward. Here, the ability of intra-AcbSh AMY-R signaling to modulate μ-OR-driven feeding was explored. Amylin (1–30 ng) was administered with the μ-OR agonist, D-Ala2, N-MePhe4, Gly-ol]-enkephalin (DAMGO) (0.25 μg), directly into the AcbSh of ad libitum-maintained rats. Amylin dose-dependently reversed DAMGO-induced hyperphagia; 3 ng of amylin reduced DAMGO-mediated feeding by nearly 50%. This dose was, however, completely ineffective at altering DAMGO-induced feeding in the anterior dorsal striatum. Intra-AcbSh amylin alone (3–30 ng) modestly suppressed 10% sucrose intake in ad libitum-maintained rats, and chow in food-deprived rats, but only at the 30-ng dose. This result indicates that reversal of AcbSh DAMGO-induced feeding at a 10-fold lower dose was neither due to malaise nor motoric impairment. Finally, intra-AcbSh infusion of the AMY-R antagonist, AC187 (20 μg), significantly attenuated the ability of prefeeding to suppress DAMGO-induced food intake, with no effects in non-prefed rats. Hence, AMY-R signaling negatively modulates μ-OR-mediated appetitive responses at the level of the AcbSh. The results with AC187 indicate that endogenous AMY-R transmission in the AcbSh curtails opioid function in the postprandial period, suggesting a novel pathway for peripheral-central integration in the control of appetitive motivation and opioid reward.
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Acknowledgements
This work was supported by R21 MH093824 (BAB), and SKB was supported by training grant T32 GM007507. We are grateful to Ken Sadeghian and Ryan Selleck for technical assistance. Facilities and procedures complied with animal use and care guidelines from the National Institutes of Health of the USA, and were approved by the Institutional Animal Care and Use Committee of the University of Wisconsin.
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Baisley, S., Baldo, B. Amylin Receptor Signaling in the Nucleus Accumbens Negatively Modulates μ-opioid-Driven Feeding. Neuropsychopharmacol 39, 3009–3017 (2014). https://doi.org/10.1038/npp.2014.153
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DOI: https://doi.org/10.1038/npp.2014.153
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