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Psychopharmacology

, Volume 233, Issue 10, pp 1911–1919 | Cite as

A role for the endocannabinoid 2-arachidonoyl-sn-glycerol for social and high-fat food reward in male mice

  • Don Wei
  • DaYeon Lee
  • Dandan Li
  • Jennifer Daglian
  • Kwang-Mook Jung
  • Daniele PiomelliEmail author
Original Investigation

Abstract

Rationale

The endocannabinoid system is an important modulator of brain reward signaling. Investigations have focused on cannabinoid (CB1) receptors, because dissection of specific contributions of individual endocannabinoids has been limited by the available toolset. While we recently described an important role for the endocannabinoid anandamide in the regulation of social reward, it remains to be determined whether the other major endocannabinoid, 2-arachidonoyl-sn-glycerol (2-AG), serves a similar or different function.

Objectives

To study the role of 2-AG in natural reward, we used a transgenic mouse model (MGL-Tg mice) in which forebrain 2-AG levels are selectively reduced. We complemented behavioral analysis with measurements of brain 2-AG levels.

Methods

We tested male MGL-Tg mice in conditioned place preference (CPP) tasks for high-fat food, social contact, and cocaine. We measured 2-AG content in the brain regions of interest by liquid chromatography/mass spectrometry.

Results

Male MGL-Tg mice are impaired in developing CPP for high-fat food and social interaction, but do develop CPP for cocaine. Furthermore, compared to isolated mice, levels of 2-AG in socially stimulated wild-type mice are higher in the nucleus accumbens and ventral hippocampus (183 and 140 % of controls, respectively), but unchanged in the medial prefrontal cortex.

Conclusions

The results suggest that reducing 2-AG-mediated endocannabinoid signaling impairs social and high-fat food reward in male mice, and that social stimulation mobilizes 2-AG in key brain regions implicated in the control of motivated behavior. The time course of this response differentiates 2-AG from anandamide, whose role in mediating social reward was previously documented.

Keywords

Monoacylglycerol lipase Social reward High-fat reward 

Notes

Acknowledgments

The authors thank Terri Wang for her generous gift. The authors thank the Autism Science Foundation, the UC Irvine Center for Autism Research and Translation, and the UC Irvine Medical Scientist Training Program.

Compliance with ethical standards

All procedures met the National Institute of Health guidelines for the care and use of laboratory animals and were approved by the Institutional Animal Care and Use Committee at University of California, Irvine.

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2016

Authors and Affiliations

  1. 1.Department of Anatomy and NeurobiologyUniversity of California, IrvineIrvineUSA
  2. 2.Department of OphthalmologyThe Fourth Affiliated Hospital of Harbin Medical UniversityHarbinChina
  3. 3.Unit of Drug Discovery and DevelopmentItalian Institute of TechnologyGenovaItaly
  4. 4.Department of Biological ChemistryUniversity of California, IrvineIrvineUSA

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