title: fosB-null mice display impaired adult hippocampal neurogenesis and spontaneous epilepsy with depressive behavior.
abstract: Patients with epilepsy are at high risk for major depression relative to the general population, and both disorders are associated with changes in adult hippocampal neurogenesis, although the mechanisms underlying disease onset remain unknown. The expression of fosB, an immediate early gene encoding FosB and ΔFosB/Δ2ΔFosB by alternative splicing and translation initiation, is known to be induced in neural progenitor cells within the subventricular zone of the lateral ventricles and subgranular zone of the hippocampus, following transient forebrain ischemia in the rat brain. Moreover, adenovirus-mediated expression of fosB gene products can promote neural stem cell proliferation. We recently found that fosB-null mice show increased depressive behavior, suggesting impaired neurogenesis in fosB-null mice. In the current study, we analyzed neurogenesis in the hippocampal dentate gyrus of fosB-null and fosB(d/d) mice that express ΔFosB/Δ2ΔFosB but not FosB, in comparison with wild-type mice, alongside neuropathology, behaviors, and gene expression profiles. fosB-null but not fosB(d/d) mice displayed impaired neurogenesis in the adult hippocampus and spontaneous epilepsy. Microarray analysis revealed that genes related to neurogenesis, depression, and epilepsy were altered in the hippocampus of fosB-null mice. Thus, we conclude that the fosB-null mouse is the first animal model to provide a genetic and molecular basis for the comorbidity between depression and epilepsy with abnormal neurogenesis, all of which are caused by loss of a single gene, fosB.
authors.affiliation: Division of Neurofunctional Genomics, Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Yutsudo
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamada
authors.forename: Kosuke
authors.initials: K
authors.lastname: Kajitani
authors.forename: Hiroko
authors.initials: H
authors.lastname: Nomaru
authors.forename: Atsuhisa
authors.initials: A
authors.lastname: Katogi
authors.forename: Yoko H
authors.initials: YH
authors.lastname: Ohnishi
authors.forename: Yoshinori N
authors.initials: YN
authors.lastname: Ohnishi
authors.forename: Kei-ichiro
authors.initials: K
authors.lastname: Takase
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Sakumi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shigeto
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Nakabeppu
mesh_terms: D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D003863:Depression / Q000150:complications / Q000235:genetics*; D004195:Disease Models, Animal; D000089622:Doublecortin Domain Proteins; D004569:Electroencephalography; D004827:Epilepsy / Q000150:complications / Q000235:genetics*; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics; D006624:Hippocampus / Q000473:pathology*; D007608:Kainic Acid / Q000494:pharmacology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D046228:Microarray Analysis; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D009154:Mutation / Q000235:genetics*; D055495:Neurogenesis / Q000235:genetics*; D009479:Neuropeptides / Q000378:metabolism; D010751:Phosphopyruvate Hydratase / Q000378:metabolism; D016760:Proto-Oncogene Proteins c-fos / Q000172:deficiency* / Q000235:genetics
chemical_list: D000089622:Doublecortin Domain Proteins; D018690:Excitatory Amino Acid Agonists; C483819:Fosb protein, mouse; D008869:Microtubule-Associated Proteins; D009479:Neuropeptides; D016760:Proto-Oncogene Proteins c-fos; D010751:Phosphopyruvate Hydratase; D001973:Bromodeoxyuridine; D007608:Kainic Acid