Aging brain microenvironment decreases hippocampal neurogenesis through Wnt-mediated survivin signaling.

Aging brain microenvironment decreases hippocampal neurogenesis through Wnt-mediated survivin signaling.
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DOI:
10.1111/j.1474-9726.2012.00816.x
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发表时间:
2012-06
期刊:
影响因子:
7.8
通讯作者:
Kaspar BK
Kaspar BK
中科院分区:
生物学1区
文献类型:
--
作者:
Miranda CJ;Braun L;Jiang Y;Hester ME;Zhang L;Riolo M;Wang H;Rao M;Altura RA;Kaspar BK

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Accumulating evidence suggests that adult hippocampus neurogenesis relies on the controlled and continued proliferation of neural progenitor cells (NPCs). With age, neurogenesis decreases through mechanisms that remain unclear, but are believed to involve changes in the NPC microenvironment. Here we provide evidence that NPC proliferation in the adult brain is in part regulated by astrocytes via Wnt signaling and that this cellular cross-talk is modified in the aging brain, leading to decreased proliferation of NPCs. Furthermore, we show that astrocytes regulate the NPC cell cycle by acting on the expression levels of survivin, a known mitotic regulator. Among cell cycle genes found downregulated in aged NPCs, survivin was the only one that restored NPC proliferation in the aged brain. Our results provide a mechanism for the gradual loss of neurogenesis in the brain associated with aging and suggest that targeted modulation of survivin expression directly or through Wnt-signaling could be used to stimulate adult neurogenesis.
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