Changes in hippocampal neurogenesis throughout early development

NEUROBIOLOGY OF AGING

卷:36

Article

Kuipers, Sjoukje D.¹  Schroeder, Joern E.²  Trentani, Andrea^3,4 

[1] Univ Bergen, Dept Biomed, N-5009 Bergen, Norway

[2] SBV Management, Hochheim Am, Germany

[3] Univ Bergen, Dept Biol & Med Psychol, N-5009 Bergen, Norway

[4] Univ Groningen, Ctr Behav & Neurosci, Dept Mol Neurobiol, Groningen, Netherlands

关键词: Aging;    BrdU;    Dentate gyrus;    Doublecortin;    Granule cell layer;    Nestin;    Neurogenesis;    Neuroprogenitor cells;    Sox1;    Subgranular zone;   

DOI  :  10.1016/j.neurobiolaging.2014.07.033

来源: Elsevier

【 摘 要 】

Adult hippocampal neurogenesis drastically diminishes with age but the underlying mechanisms remain unclear. Here, age-related influences on the hippocampal early neuroprogenitor cell (NPC) pool was examined by quantifying changes in Sox1-expressing cells in the dentate gyrus subgranular zone from early adulthood (3 months) to middle age (12 months). Proliferation of distinct NPC subpopulations (Sox1+, Nestin+, and Doublecortin+) and newborn cell survival were also investigated. Examination of total 5-bromodeoxyuridine (BrdU) + and Doublecortin (DCX) +/- cells revealed an early and dramatic age-dependent decline of hippocampal neurogenesis. Increasing age from 3 to 12 months was primarily associated with reduced total proliferation, in vivo (-79% of BrdU+ cells) but not in vitro, and DCX+ cell numbers (-89%). When proliferative rates of individual NPC subpopulations were examined, a different picture emerged as proliferating Nestin+ neuroprogenitors (-95% at 9 months) and BrdU+/DCX+ neuroblasts and/or immature neurons (-83% at 12 months) declined the most, whereas proliferating Sox1+ NPCs only dropped by 53%. Remarkably, despite greatly reduced proliferative rates and recent reports of Nestin+ neuroprogenitor loss, total numbers of early Sox1+ NPCs were unaffected by age (at least up to middle age), and newborn cell survival within the dentate gyrus was increased. Neuronal differentiation was concomitantly reduced; however, thus suggesting age-associated changes in fate-choice determination. (C) 2015 The Authors. Published by Elsevier Inc. All rights reserved.

【 授权许可】

Free