Soluble amyloid precursor protein-α rescues age-linked decline in neural progenitor cell proliferation.

Authors: Demars MP; Hollands C; Zhao KD; Lazarov O

Abstract: Neurogenesis is thought to play a role in cognitive function and hippocampal plasticity. Previous studies suggest that neurogenesis declines with aging. However, the onset and mechanism of declined neurogenesis are not fully elucidated. Here we show that the major decline in neurogenesis takes place during adulthood, before aging. Decline in neurogenesis takes place in the subgranular layer of the dentate gyrus and in the subventricular zone, and is primarily due to a reduced number of fast-proliferating neural progenitor cells. Importantly, this decline can be rescued by intraventricular injection of recombinant soluble amyloid precursor protein (sAPPalpha), which regulates neural progenitor cell proliferation in the adult brain. The counterpart, sAPPbeta, a product of the amyloidogenic cleavage pathway of amyloid precursor protein, fails to exhibit a proliferative effect in vitro and in vivo, in equimolar concentrations to sAPPalpha. These observations suggest that adulthood is an appropriate time window for an intervention that upregulates neurogenesis, such as enhancement of sAPPalpha levels, for the prevention of declining brain plasticity and cognitive function.

Journal: Neurobiology of aging
Date: May 21, 2013
PMID: 23683827
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Categories: Aging
Citation:

Demars MP, Hollands C, Zhao KD, Lazarov O (2013) Soluble amyloid precursor protein-α rescues age-linked decline in neural progenitor cell proliferation. Neurobiology of aging.



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