title: Cadherin-8 expression, synaptic localization, and molecular control of neuronal form in prefrontal corticostriatal circuits.
abstract: Neocortical interactions with the dorsal striatum support many motor and executive functions, and such underlying functional networks are particularly vulnerable to a variety of developmental, neurological, and psychiatric brain disorders, including autism spectrum disorders, Parkinson's disease, and Huntington's disease. Relatively little is known about the development of functional corticostriatal interactions, and in particular, virtually nothing is known of the molecular mechanisms that control generation of prefrontal cortex-striatal circuits. Here, we used regional and cellular in situ hybridization techniques coupled with neuronal tract tracing to show that Cadherin-8 (Cdh8), a homophilic adhesion protein encoded by a gene associated with autism spectrum disorders and learning disability susceptibility, is enriched within striatal projection neurons in the medial prefrontal cortex and in striatal medium spiny neurons forming the direct or indirect pathways. Developmental analysis of quantitative real-time polymerase chain reaction and western blot data show that Cdh8 expression peaks in the prefrontal cortex and striatum at P10, when cortical projections start to form synapses in the striatum. High-resolution immunoelectron microscopy shows that Cdh8 is concentrated at excitatory synapses in the dorsal striatum, and Cdh8 knockdown in cortical neurons impairs dendritic arborization and dendrite self-avoidance. Taken together, our findings indicate that Cdh8 delineates developing corticostriatal circuits where it is a strong candidate for regulating the generation of normal cortical projections, neuronal morphology, and corticostriatal synapses.
authors.affiliation: Fishberg Department of Neuroscience, Friedman Brain Institute and The Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, 10029.
authors.forename: Lauren G
authors.initials: LG
authors.lastname: Friedman
authors.forename: Fréderike W
authors.initials: FW
authors.lastname: Riemslagh
authors.forename: Josefa M
authors.initials: JM
authors.lastname: Sullivan
authors.forename: Roxana
authors.initials: R
authors.lastname: Mesias
authors.forename: Frances M
authors.initials: FM
authors.lastname: Williams
authors.forename: George W
authors.initials: GW
authors.lastname: Huntley
authors.forename: Deanna L
authors.initials: DL
authors.lastname: Benson
mesh_terms: D000818:Animals; D015820:Cadherins / Q000378:metabolism*; D002478:Cells, Cultured; D003342:Corpus Striatum / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D003712:Dendrites / Q000502:physiology; D005260:Female; D018698:Glutamic Acid / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D008297:Male; D008810:Mice, Inbred C57BL; D009434:Neural Pathways / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000502:physiology; D017397:Prefrontal Cortex / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D017207:Rats, Sprague-Dawley; D013569:Synapses / Q000378:metabolism*
chemical_list: D015820:Cadherins; C504541:Cdh8 protein, mouse; C504540:Cdh8 protein, rat; D012333:RNA, Messenger; D018698:Glutamic Acid
keywords: cadherin; cell adhesion molecules; immunogold; prefrontal cortex; striatum; synapse