title: Differential proliferation rhythm of neural progenitor and oligodendrocyte precursor cells in the young adult hippocampus.
abstract: Oligodendrocyte precursor cells (OPCs) are a unique type of glial cells that function as oligodendrocyte progenitors while constantly proliferating in the normal condition from rodents to humans. However, the functional roles they play in the adult brain are largely unknown. In this study, we focus on the manner of OPC proliferation in the hippocampus of the young adult mice. Here we report that there are oscillatory dynamics in OPC proliferation that differ from neurogenesis in the subgranular zone (SGZ); the former showed S-phase and M-phase peaks in the resting and active periods, respectively, while the latter only exhibited M-phase peak in the active period. There is coincidence between different modes of proliferation and expression of cyclin proteins that are crucial for cell cycle; cyclin D1 is expressed in OPCs, while cyclin D2 is observed in neural stem cells. Similar to neurogenesis, the proliferation of hippocampal OPCs was enhanced by voluntary exercise that leads to an increase in neuronal activity in the hippocampus. These data suggest an intriguing control of OPC proliferation in the hippocampus.
authors: Division of Developmental Neuroscience, Center for Translational and Advanced Animal Research, Graduate School of Medicine, Tohoku University, Sendai, Japan.
authors: Yoko
authors: Y
authors: Matsumoto
authors: Yuji
authors: Y
authors: Tsunekawa
authors: Tadashi
authors: T
authors: Nomura
authors: Fumikazu
authors: F
authors: Suto
authors: Miho
authors: M
authors: Matsumata
authors: Shigeru
authors: S
authors: Tsuchiya
authors: Noriko
authors: N
authors: Osumi
mesh_terms: D000818:Animals; D049109:Cell Proliferation; D019938:Cyclin D1 / Q000378:metabolism; D005786:Gene Expression Regulation; D006624:Hippocampus / Q000166:cytology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D058953:Neural Stem Cells / Q000166:cytology* / Q000378:metabolism; D055495:Neurogenesis; D009836:Oligodendroglia / Q000166:cytology* / Q000378:metabolism; D010805:Physical Conditioning, Animal
chemical_list: D019938:Cyclin D1