Human Hippocampal Neurogenesis Persists throughout Aging.

Human Hippocampal Neurogenesis Persists throughout Aging.
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DOI:
10.1016/j.stem.2018.03.015
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发表时间:
2018-04-05
期刊:
影响因子:
23.9
通讯作者:
Mann JJ
Mann JJ
中科院分区:
医学1区
文献类型:
--
作者:
Boldrini M;Fulmore CA;Tartt AN;Simeon LR;Pavlova I;Poposka V;Rosoklija GB;Stankov A;Arango V;Dwork AJ;Hen R;Mann JJ

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老年啮齿动物和灵长类动物的成年海马神经发生下降。老年人被认为表现出神经发生和运动诱导的血管生成减弱,从而导致神经源性海马齿状回(DG)区域的体积减少,尽管这些参数的同时变化还没有得到很好的研究。在这里,我们评估了从14岁到79岁的健康人类个体的整体尸检的campi。我们发现类似数量的中间神经祖细胞和成千上万的未成熟的神经元的DG,胶质细胞和成熟颗粒神经元的数量相当,和各年龄段的DG体积相等。然而,老年人有较少的血管生成和神经可塑性和一个较小的静态祖细胞池中的前中DG,没有变化的后DG。因此,没有认知障碍、神经精神疾病或治疗的健康老年受试者显示出保留的神经发生。海马体神经发生的持续可能会在整个生命过程中维持人类特定的认知功能,而这种下降可能与认知情绪弹性受损有关。Boldrini等人发现,尽管静止干细胞库、血管生成和神经可塑性下降,但人类的成年神经发生持续到生命的第八个十年。超过65岁的年龄跨度,增殖的神经祖细胞,未成熟和成熟的颗粒神经元,神经胶质细胞,和齿状回体积不变。
Adult hippocampal neurogenesis declines in aging rodents and primates. Aging humans are thought to exhibit waning neurogenesis and exercise-induced angiogenesis, with a resulting volumetric decrease in the neurogenic hippocampal dentate gyrus (DG) region, although concurrent changes in these parameters are not well studied. Here we assessed whole-autopsy hippocampi from healthy human individuals ranging from 14 to 79 years of age. We found similar numbers of intermediate neural progenitors and thousands of immature neurons in the DG, comparable numbers of glia and mature granule neurons, and equivalent DG volume across ages. Nevertheless, older individuals have less angiogenesis and neuroplasticity and a smaller quiescent progenitor pool in anterior-mid DG, with no changes in posterior DG. Thus, healthy older subjects without cognitive impairment, neuropsychiatric disease, or treatment display preserved neurogenesis. It is possible that ongoing hippocampal neurogenesis sustains human-specific cognitive function throughout life and that declines may be linked to compromised cognitive-emotional resilience. Boldrini et al. find persistent adult neurogenesis in humans into the eighth decade of life, despite declines in quiescent stem cell pools, angiogenesis, and neuroplasticity. Over a 65-year age span, proliferating neural progenitors, immature and mature granule neurons, glia, and dentate gryus volume were unchanged.
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