The glucagon-like peptide 1 (GLP-1) receptor agonist exendin-4 reduces cocaine self-administration in mice

PHYSIOLOGY & BEHAVIOR

卷:149

Article

Sorensen, Gunnar^1,2  Reddy, India A.^4,5,6  Weikop, Pia^1,2  Graham, Devon L.⁷  Stanwood, Gregg D.⁷  Wortwein, Gitta^1,3  Galli, Aurelio^5,6  Fink-Jensen, Anders^1,2 

[1] Univ Copenhagen, Lab Neuropsychiat, Dept Neurosci & Pharmacol, DK-2100 Copenhagen, Denmark

[2] Univ Copenhagen, Psychiat Ctr Copenhagen, DK-2100 Copenhagen, Denmark

[3] Univ Copenhagen, Dept Publ Hlth, DK-2100 Copenhagen, Denmark

[4] Vanderbilt Univ, Med Ctr, Neurosci Grad Program, Nashville, TN USA

[5] Vanderbilt Univ, Med Ctr, Dept Mol Physiol & Biophys, Nashville, TN USA

[6] Vanderbilt Univ, Med Ctr, Neurosci Program Subst Abuse, Nashville, TN USA

[7] Florida State Univ, Dept Biomed Sci, Coll Med, Tallahassee, FL 32306 USA

关键词: GLP-1;    Exendin-4;    Self-administration;    Cocaine;    c-Fos;    Dopamine;    Addiction;   

DOI  :  10.1016/j.physbeh.2015.06.013

来源: Elsevier

【 摘 要 】

Glucagon-like peptide 1 (GLP-1) analogues are used for the treatment of type 2 diabetes. The ability of the GLP-1 system to decrease food intake in rodents has been well described and parallels results from clinical trials. GLP-1 receptors are expressed in the brain, including within the ventral tegmental area (VTA) and the nucleus accumbens (NAc). Dopaminergic neurons in the VTA project to the NAc, and these neurons play a pivotal role in the rewarding effects of drugs of abuse. Based on the anatomical distribution of GLP-1 receptors in the brain and the well-established effects of GLP-1 on food reward, we decided to investigate the effect of the GLP-1 analogue exendin-4 on cocaine- and dopamine D1-receptor agonist-induced hyperlocomotion, on acute and chronic cocaine self-administration, on cocaine-induced striatal dopamine release in mice and on cocaine-induced c-fos activation. Here, we report that GLP-1 receptor stimulation reduces acute and chronic cocaine self-administration and attenuates cocaine-induced hyperlocomotion. In addition, we show that peripheral administration of exendin-4 reduces cocaine-induced elevation of striatal dopamine levels and striatal c-fos expression implicating central GLP-1 receptors in these responses. The present results demonstrate that the GLP-1 system modulates cocaine's effects on behavior and dopamine homeostasis, indicating that the GLP-1 receptor may be a novel target for the pharmacological treatment of drug addiction. (C) 2015 Elsevier Inc. All rights reserved.

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