title: Huntingtin acts non cell-autonomously on hippocampal neurogenesis and controls anxiety-related behaviors in adult mouse.
abstract: Huntington's disease (HD) is a fatal neurodegenerative disease, characterized by motor defects and psychiatric symptoms, including mood disorders such as anxiety and depression. HD is caused by an abnormal polyglutamine (polyQ) expansion in the huntingtin (HTT) protein. The development and analysis of various mouse models that express pathogenic polyQ-HTT revealed a link between mutant HTT and the development of anxio-depressive behaviors and various hippocampal neurogenesis defects. However, it is unclear whether such phenotype is linked to alteration of HTT wild-type function in adults. Here, we report the analysis of a new mouse model in which HTT is inducibly deleted from adult mature cortical and hippocampal neurons using the CreER(T2)/Lox system. These mice present defects in both the survival and the dendritic arborization of hippocampal newborn neurons. Our data suggest that these non-cell autonomous effects are linked to defects in both BDNF transport and release upon HTT silencing in hippocampal neurons, and in BDNF/TrkB signaling. The controlled deletion of HTT also had anxiogenic-like effects. Our results implicate endogenous wild-type HTT in adult hippocampal neurogenesis and in the control of mood disorders.
authors.affiliation: Institut Curie, Orsay, France ; CNRS UMR3306, Orsay, France ; INSERM U1005, Orsay, France ; University Paris-Sud, Orsay, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Pla
authors.forename: Sophie
authors.initials: S
authors.lastname: Orvoen
authors.forename: Caroline
authors.initials: C
authors.lastname: Benstaali
authors.forename: Sophie
authors.initials: S
authors.lastname: Dodier
authors.forename: Alain M
authors.initials: AM
authors.lastname: Gardier
authors.forename: Denis J
authors.initials: DJ
authors.lastname: David
authors.forename: Sandrine
authors.initials: S
authors.lastname: Humbert
authors.forename: Frédéric
authors.initials: F
authors.lastname: Saudou
mesh_terms: D000818:Animals; D001007:Anxiety / Q000503:physiopathology*; D001522:Behavior, Animal; D006624:Hippocampus / Q000502:physiology*; D000071058:Huntingtin Protein; D051379:Mice; D018345:Mice, Knockout; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000502:physiology*; D055495:Neurogenesis / Q000502:physiology*; D009687:Nuclear Proteins / Q000235:genetics / Q000502:physiology*; D013629:Tamoxifen / Q000008:administration & dosage
chemical_list: C506812:Htt protein, mouse; D000071058:Huntingtin Protein; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D013629:Tamoxifen
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