| The role of nucleus accumbens adenosine-opioid interaction in mediating palatable food intake. | |
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MedLine Citation:
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PMID: 19822132 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nucleus accumbens micro-opioid stimulation leads to robust increases in the intake of highly palatable foods, such as a high-fat diet. While interactions between opioids and certain striatal neurotransmitters underlying this phenomenon have been explored, many potential interactions have not. Striatal adenosine has been shown to have a significant influence on striatal neurotransmission and locomotor activity behavior, however the interaction between opioids and adenosine on feeding behaviors has received less attention. The present study explored this interaction within the context of opioid-driven consumption of a high-fat diet. Specifically, intra-accumbens administration of selective A1 and A2(A) adenosine receptor ligands, with or without concurrent administration of the micro-opioid agonist (D)-Ala(2),N,Me-Phe(4),Gly-ol(5)-enkaphalin (DAMGO), on high-fat consumption and associated locomotor activity was examined. The A1 receptor agonist 2-Chloro-N6-cyclopentyladenosine (CCPA) had no effect on either baseline or DAMGO-induced locomotor or consumption behaviors associated with the high-fat diet. However, the A2(A) receptor agonist 2-p-(2 carboxyethyl)-phenethylamino-5'-N-ethylcarboxamido adenosine hydrochloride (CGS 21680) and the prodrug of the A2(A) receptor antagonist MSX-2, 3-(3-hydroxypropyl)-8-(m-methoxystyryl)-7-methyl-1-propargylxanthine phosphate disodium salt (MSX-3) produced the expected decrease and increase in locomotor activity, respectively. CGS 21680 had no effect on baseline or DAMGO-driven consumption of the high-fat diet. MSX-3 had no effect on DAMGO-induced locomotor activity but increased DAMGO-induced consumption. Lastly, the increased activity and consumption produced by MSX-3 alone was blocked by prior administration of the opioid antagonist naltrexone. In summary, these results suggest a potential role of striatal adenosine A2(A) receptors in mediating baseline and striatal opioid-mediated intake of a high-fat diet. |
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Authors:
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Carolyn E Pritchett; Alicia L Pardee; Sophia R McGuirk; Matthew J Will |
Publication Detail:
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Type: Journal Article Date: 2009-10-12 |
Journal Detail:
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Title: Brain research Volume: 1306 ISSN: 1872-6240 ISO Abbreviation: Brain Res. Publication Date: 2010 Jan |
Date Detail:
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Created Date: 2009-11-27 Completed Date: 2010-02-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0045503 Medline TA: Brain Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 85-92 Citation Subset: IM |
Affiliation:
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Department of Neural and Behavioral Sciences, Penn State College of Medicine, Hershey, PA 17033, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenosine
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analogs & derivatives,
pharmacology Animals Catheterization Central Nervous System Agents / pharmacology Dietary Fats* Eating / drug effects, physiology* Enkephalin, Ala(2)-MePhe(4)-Gly(5)- / pharmacology Locomotion / drug effects, physiology Male Naltrexone / pharmacology Narcotic Antagonists / pharmacology Nucleus Accumbens / drug effects, physiology* Phenethylamines / pharmacology Rats Rats, Sprague-Dawley Receptor, Adenosine A1 / agonists, metabolism* Receptor, Adenosine A2A / agonists, antagonists & inhibitors, metabolism* Receptors, Opioid, mu / agonists, antagonists & inhibitors, metabolism* Xanthines / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Central Nervous System Agents; 0/Dietary Fats; 0/MSX 3 compound; 0/Narcotic Antagonists; 0/Phenethylamines; 0/Receptor, Adenosine A1; 0/Receptor, Adenosine A2A; 0/Receptors, Opioid, mu; 0/Xanthines; 100929-53-1/Enkephalin, Ala(2)-MePhe(4)-Gly(5)-; 120225-54-9/CGS 21680; 16590-41-3/Naltrexone; 37739-05-2/2-chloro-N(6)cyclopentyladenosine; 58-61-7/Adenosine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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