Striatal GPR88 modulates foraging efficiency
Rainwater, Aundrea (Howard Hughes Medical Institute (Maryland, Estats Units d'Amèrica))
Sanz Iglesias, Elisenda (Universitat Autònoma de Barcelona. Institut de Neurociències)
Palmiter, Richard D. (Howard Hughes Medical Institute (Maryland, Estats Units d'Amèrica))
Quintana Romero, Albert (Universitat Autònoma de Barcelona. Institut de Neurociències)

Date:	2017
Abstract:	The striatum is anatomically and behaviorally implicated in behaviors that promote efficient foraging. To investigate this function, we studied instrumental choice behavior in mice lacking GPR88, a striatum-enriched orphan G-protein-coupled receptor that modulates striatal medium spiny neuron excitability. Our results reveal that hungry mice lacking GPR88 (KO mice) were slow to acquire food-reinforced lever press but could lever press similar to controls on a progressive ratio schedule. Both WT and KO mice discriminated between reward and no-reward levers; however, KO mice failed to discriminate based on relative quantity-reward (1 vs 3 food pellets) or effort (3 vs 9 lever presses). We also demonstrate preference for the high-reward (3 pellet) lever was selectively reestablished when GPR88 expression was restored to the striatum. We propose that GPR88 expression within the striatum is integral to efficient action-selection during foraging. SIGNIFICANCE STATEMENT Evolutionary pressure driving energy homeostasis favored detection and comparison of caloric value. In wild and laboratory settings, neural systems involved in energy homeostasis bias foraging to maximize energy efficiency. This is observed when foraging behaviors are guided by superior nutritional density or minimized caloric expenditure. The striatum is anatomically and functionally well placed to perform the sensory and motor integration necessary for efficient action selection during foraging. However, few studies have examined this behavioral phenomenon or elucidated underlying molecular mechanisms. Both humans and mice with nonfunctional GPR88 have been shown to present striatal dysfunctions and impaired learning. We demonstrate that GPR88 expression is necessary to efficiently integrate effort and energy density information guiding instrumental choice.
Grants:	European Commission 658352 European Commission 638106 Ministerio de Economía y Competitividad SAF2014-57981P Ministerio de Economía y Competitividad RyC-2012-11873
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Action selection ; Decision making ; Mouse genetics ; Striatum
Published in:	The Journal of neuroscience, Vol. 37, Núm. 33 (August 2017) , p. 7939-7947, ISSN 1529-2401

DOI: 10.1523/JNEUROSCI.2439-16.2017
PMID: 28729439

Post-print 9 p, 846.3 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Health sciences and biosciences > Institut de Neurociències (INc)
Articles > Research articles
Articles > Published articles