Cited by 138Neurotransmitter Receptor Influence on BehaviorRegulation of Appetite and ObesityEating Disorders and Behaviors

Underweight rats have enhanced dopamine release and blunted acetylcholine response in the nucleus accumbens while bingeing on sucrose

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Avena, N.M., Rada, P., Hoebel, B.G.·2008·Neuroscience

Abstract

The present study tested whether rats release more accumbens dopamine (DA) during a sugar binge when they are underweight vs. normal weight. Since acetylcholine (ACh) in the nucleus accumbens (NAc) normally increases as a meal progresses and satiety ensues, we also tested whether ACh release is altered when an animal has lost weight. Rats were maintained on daily 8-h access to chow, with 10% sucrose solution available for the first 2 h. Microdialysis performed on day 21, at normal body weight, revealed an increase in extracellular DA to 122% of baseline in response to drinking sucrose. Extracellular ACh peaked at the end of the meal. Next, the rats were food and sucrose restricted so that by day 28 they were at 85% body weight. When retested, these animals released significantly more DA when drinking sucrose (179%), but ACh release failed to rise. A control group was tested in the same manner but given sugar only on days 1, 21 and 28. At normal body weight, control animals showed a non-significant rise in DA when drinking sucrose on day 21. On day 28, at 85% body weight, the controls showed a small increase (124%) in DA release; however, this was significantly lower than the 179% observed in the underweight rats with daily sugar access. These findings suggest that when an animal binges on sugar and then loses weight, the binge releases significantly more DA and less ACh than when animals are at a normal body weight.

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Crossref · 10.1016/j.neuroscience.2008.08.017

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  1. American Psychiatric Association 2000 Diagnostic and statistical manual of mental disorders fourth edition text revision (DSM-IV-TR) Washington, DC American Psychiatric Association

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Authors
Avena, N. M., Rada, P., & Hoebel, B. G.
Affiliations
Princeton University (US)
Venue
Neuroscience
Publisher
Elsevier BV
Published
2008-10
Volume
156
Issue
4
Pages
865-871
ISSN
0306-4522 (ISSN-L)
OpenAlex
W1965134469
Cited by
138
References
45
Citations by year
2026: 2 · 2025: 5 · 2024: 7 · 2023: 2 · 2022: 10 · 2021: 8 · 2020: 7 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 15 · 2015: 16 · 2014: 11 · 2013: 8 · 2012: 14
FWCI
2.74
Type
journal article
Language
en
Open access
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Mental Health (MH65024, R21MH065024)
  • National Institute on Drug Abuse (DA-10608, R01DA010608, F31DA016458, DA-16458)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-79793, F32DK079793)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Social Sciences › Psychology › Clinical Psychology › Eating Disorders and Behaviors
Keywords
dopamine release, acetylcholine release, nucleus accumbens, dietary restriction, satiety
MeSH terms
Acetylcholine, Analysis of Variance, Animals, Behavior, Animal, Body Weight, Bulimia, Chromatography, High Pressure Liquid, Dopamine, Food Deprivation, Male, Nucleus Accumbens, Sucrose, Sweetening Agents, Time Factors, Rats, Sprague-Dawley, Microdialysis, Rats

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