Time-of-day-dependent enhancement of adult neurogenesis in the hippocampus.

Time-of-day-dependent enhancement of adult neurogenesis in the hippocampus.
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DOI:
10.1371/journal.pone.0003835
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
Fukada, Yoshitaka
Fukada, Yoshitaka
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tamai, So-ichi;Sanada, Kamon;Fukada, Yoshitaka

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成年神经发生发生在哺乳动物大脑的特定区域,如海马的齿状回。在神经发生区,神经前体细胞不断分裂并产生新的神经元。虽然海马体中神经元和神经胶质的生物学特性已被证明根据一天中的特定时间而波动,但尚不清楚成年大脑中的神经祖细胞和神经发生是否在一天中受到时间控制。在这里,我们证明,在成年小鼠海马齿状回,M期细胞的数量显示了一个白天/夜间的变化,在夜间显着增加。在前脑的脑室下区(成年神经发生的另一个部位),M期细胞数量在一天中是恒定的,表明祖细胞有丝分裂的每日节律是区域特异性的。重要的是,海马祖细胞有丝分裂的夜间增强伴随着新生神经元的夜间增加。这些结果表明,在成年海马的神经发生发生在一天中的时间依赖的方式,这可能会决定每日修改齿状回生理。
Adult neurogenesis occurs in specific regions of the mammalian brain such as the dentate gyrus of the hippocampus. In the neurogenic region, neural progenitor cells continuously divide and give birth to new neurons. Although biological properties of neurons and glia in the hippocampus have been demonstrated to fluctuate depending on specific times of the day, it is unclear if neural progenitors and neurogenesis in the adult brain are temporally controlled within the day. Here we demonstrate that in the dentate gyrus of the adult mouse hippocampus, the number of M-phase cells shows a day/night variation throughout the day, with a significant increase during the nighttime. The M-phase cell number is constant throughout the day in the subventricular zone of the forebrain, another site of adult neurogenesis, indicating the daily rhythm of progenitor mitosis is region-specific. Importantly, the nighttime enhancement of hippocampal progenitor mitosis is accompanied by a nighttime increase of newborn neurons. These results indicate that neurogenesis in the adult hippocampus occurs in a time-of-day-dependent fashion, which may dictate daily modifications of dentate gyrus physiology.
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