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• W2037028711 abstract "The orexigenic peptide hormone ghrelin is synthesized in the stomach and its receptor growth hormone secretagogue receptor (GHSR1a) is expressed mainly in the central nervous system (CNS). In this review, we confine our discussion to the physiological role of GHSR1a in the brain. Paradoxically, despite broad expression of GHSR1a in the CNS, other than trace amounts in the hypothalamus, ghrelin is undetectable in the brain. In our efforts to elucidate the function of the ligand-free ghrelin receptor (apo-GHSR1a), we identified subsets of neurons that co-express GHSR1a and dopamine receptors. In this review, we focus on interactions between apo-GHSR1a and dopamine-2 receptor (DRD2) and formation of GHSR1a:DRD2 heteromers in hypothalamic neurons that regulate appetite, and discuss implications for the treatment of Prader-Willi syndrome (PWS). GHSR1a antagonists of distinct chemical structures, a quinazolinone and a triazole, respectively, enhance and inhibit dopamine signaling through GHSR1a:DRD2 heteromers by an allosteric mechanism. This finding illustrates a potential strategy for designing the next generation of drugs for treating eating disorders as well as psychiatric disorders caused by abnormal dopamine signaling. Treatment with a GHSR1a antagonist that enhances dopamine/DRD2 activity in GHSR1a:DRD2 expressing hypothalamic neurons has the potential to inhibit the uncontrollable hyperphagia associated with PWS. DRD2 antagonists are prescribed for treating schizophrenia, but these block dopamine signaling in all DRD2 expressing neurons and are associated with adverse side effects, including enhanced appetite and excessive weight gain. A GHSR1a antagonist of structural class that allosterically blocks dopamine/DRD2 action in GHSR1a:DRD2 expressing neurons would have no effect on neurons expressing DRD2 alone; therefore, the side effects of DRD2 antagonists would potentially be reduced thereby enhancing patient compliance." @default.
• W2037028711 created "2016-06-24" @default.
• W2037028711 creator A5010152293 @default.
• W2037028711 creator A5078565913 @default.
• W2037028711 creator A5091876557 @default.
• W2037028711 date "2014-08-18" @default.
• W2037028711 modified "2023-10-18" @default.
• W2037028711 title "Apo-Ghrelin Receptor (apo-GHSR1a) Regulates Dopamine Signaling in the Brain" @default.
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• W2037028711 doi "https://doi.org/10.3389/fendo.2014.00129" @default.
• W2037028711 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4135303" @default.
• W2037028711 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25183960" @default.
• W2037028711 hasPublicationYear "2014" @default.
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