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• W647659435 abstract "Background GPR88 is an orphan G protein coupled receptor highly enriched in the striatum, and previous studies have focused on GPR88 function in striatal physiology. The receptor is also expressed in other brain areas, and here we examined whether GPR88 function extends beyond striatal-mediated responses. Methods We created Gpr88 knockout mice and examined both striatal and extrastriatal regions at molecular and cellular levels. We also tested striatum-, hippocampus-, and amygdala-dependent behaviors in Gpr88−/− mice using extensive behavioral testing. Results We found increased G protein coupling for delta opioid receptor (DOR) and mu opioid, but not other Gi/o coupled receptors, in the striatum of Gpr88 knockout mice. We also found modifications in gene transcription, dopamine and serotonin contents, and dendritic morphology inside and outside the striatum. Behavioral testing confirmed striatal deficits (hyperactivity, stereotypies, motor impairment in rotarod). In addition, mutant mice performed better in spatial tasks dependent on hippocampus (Y-maze, novel object recognition, dual solution cross-maze) and also showed markedly reduced levels of anxiety (elevated plus maze, marble burying, novelty suppressed feeding). Strikingly, chronic blockade of DOR using naltrindole partially improved motor coordination and normalized spatial navigation and anxiety of Gpr88−/− mice. Conclusions We demonstrate that GPR88 is implicated in a large repertoire of behavioral responses that engage motor activity, spatial learning, and emotional processing. Our data also reveal functional antagonism between GPR88 and DOR activities in vivo. The therapeutic potential of GPR88 therefore extends to cognitive and anxiety disorders, possibly in interaction with other receptor systems." @default.
• W647659435 created "2016-06-24" @default.
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• W647659435 date "2016-06-01" @default.
• W647659435 modified "2023-10-06" @default.
• W647659435 title "Mice Lacking GPR88 Show Motor Deficit, Improved Spatial Learning, and Low Anxiety Reversed by Delta Opioid Antagonist" @default.
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• W647659435 doi "https://doi.org/10.1016/j.biopsych.2015.05.020" @default.
• W647659435 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4670823" @default.
• W647659435 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26188600" @default.
• W647659435 hasPublicationYear "2016" @default.
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