title: Age-dependent regulation of synaptic connections by dopamine D2 receptors.
abstract: Dopamine D2 receptors (D2R) are G protein-coupled receptors that modulate synaptic transmission and are important for various brain functions, including learning and working memory. Abnormal D2R signaling has been implicated in psychiatric disorders such as schizophrenia. Here we report a new function of D2R in dendritic spine morphogenesis. Activation of D2R reduced spine number via GluN2B- and cAMP-dependent mechanisms in mice. Notably, this regulation occurred only during adolescence. During this period, D2R overactivation caused by mutations in the schizophrenia risk gene Dtnbp1 led to spine deficiency, dysconnectivity in the entorhinal-hippocampal circuit and impairment of spatial working memory. Notably, these defects could be ameliorated by D2R blockers administered during adolescence. Our findings suggest an age-dependent function of D2R in spine development, provide evidence that D2R dysfunction during adolescence impairs neuronal circuits and working memory, and indicate that adolescent interventions to prevent aberrant D2R activity protect against cognitive impairment.
authors.affiliation: Unit on Synapse Development and Plasticity, National Institute of Mental Health, US National Institutes of Health, Bethesda, Maryland, USA.
authors.forename: Jie-Min
authors.initials: JM
authors.lastname: Jia
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Hu
authors.forename: Daniel
authors.initials: D
authors.lastname: Lindberg
authors.forename: Zheng
authors.identifier: 0000000229782531
authors.initials: Z
authors.lastname: Li
mesh_terms: D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000367:Age Factors; D000375:Aging; D000779:Anesthetics, Local / Q000494:pharmacology; D000818:Animals; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology; D003623:Dark Adaptation / Q000187:drug effects / Q000502:physiology; D015259:Dopamine Agents / Q000494:pharmacology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology*; D005786:Gene Expression Regulation / Q000235:genetics; D006624:Hippocampus / Q000166:cytology; D066298:In Vitro Techniques; D018782:Maze Learning / Q000187:drug effects / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D009474:Neurons / Q000166:cytology* / Q000187:drug effects; D051381:Rats; D017448:Receptors, Dopamine D2 / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism; D013569:Synapses / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors
chemical_list: D000779:Anesthetics, Local; D015259:Dopamine Agents; D018691:Excitatory Amino Acid Antagonists; C121001:NR2B NMDA receptor; D017448:Receptors, Dopamine D2; D016194:Receptors, N-Methyl-D-Aspartate; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione