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Dopamine signaling in the amygdala, increased by food ingestion and GLP-1, regulates feeding behavior.

Journal article
Authors Rozita H Anderberg
Christine Anefors
Filip Bergquist
Hans Nissbrandt
Karolina P Skibicka
Published in Physiology & behavior
Volume 136
Pages 135–144
ISSN 1873-507X
Publication year 2014
Published at Institute of Neuroscience and Physiology, Department of Physiology
Institute of Neuroscience and Physiology, Department of Pharmacology
Pages 135–144
Language en
Links dx.doi.org/10.1016/j.physbeh.2014.0...
Keywords Amygdala, Dopamine, Food reward, Food intake, Obesity, GLP-1, Exendin-4
Subject categories Pharmacology, Neuroscience

Abstract

Mesolimbic dopamine plays a critical role in food-related reward processing and learning. The literature focuses primarily on the nucleus accumbens as the key dopaminergic target in which enhanced dopamine signaling is associated with reward. Here, we demonstrate a novel neurobiological mechanism by which dopamine transmission in the amygdala regulates food intake and reward. We show that food intake was associated with increased dopamine turnover in the amygdala. Next, we assess the impact of direct intra-amygdala D1 and D2 receptor activation on food intake and sucrose-driven progressive ratio operant conditioning in rats. Amygdala D2 receptor activation reduced food intake and operant behavior for sucrose, whereas D2 receptor blockade increased food intake but surprisingly reduced operant behavior. In contrast, D1 receptor stimulation or blockade did not alter feeding or operant conditioning for food. The glucagon-like peptide 1 (GLP-1) system, a target for type 2 diabetes treatment, in addition to regulating glucose homeostasis, also reduces food intake. We found that central GLP-1R receptor activation is associated with elevated dopamine turnover in the amygdala, and that part of the anorexic effect of GLP-1 is mediated by D2 receptor signaling in the amygdala. Our findings indicate that amygdala dopamine signaling is activated by both food intake and the anorexic brain-gut peptide GLP-1 and that amygdala D2 receptor activation is necessary and sufficient to change feeding behavior. Collectively these studies indicate a novel mechanism by which the dopamine system affects feeding-oriented behavior at the level of the amygdala.

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