Abstract
β-amyloid (Aβ) can promote neurogenesis, both in vitro and in vivo, by inducing neural progenitor cells to differentiate into neurons. The choroid plexus in Alzheimer’s disease (AD) is burdened with amyloid deposits and hosts neuronal progenitor cells. However, neurogenesis in this brain tissue is not firmly established. To investigate this issue further, we examined the effect of Aβ on the neuronal differentiation of choroid plexus epithelial cells in several experimental models of AD. Here we show that Aβ regulates neurogenesis in vitro in cultured choroid plexus epithelial cells as well as in vivo in the choroid plexus of APP/Ps1 mice. Treatment with oligomeric Aβ increased proliferation and differentiation of neuronal progenitor cells in cultured choroid plexus epithelial cells, but decreased survival of newly born neurons. These Aβ-induced neurogenic effects were also observed in choroid plexus of APP/PS1 mice, and detected also in autopsy tissue from AD patients. Analysis of signaling pathways revealed that pre-treating the choroid plexus epithelial cells with specific inhibitors of TyrK or MAPK diminished Aβ-induced neuronal proliferation. Taken together, our results support a role of Aβ in proliferation and differentiation in the choroid plexus epithelial cells in Alzheimer’s disease.







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Acknowledgments
This work was supported by grants from Instituto de Salud Carlos III (FIS 09-01636), Fundación Investigación Médica Mutua Madrileña (2008/93; 2010/0004), and CIBERNED (BESAD-P.2010) awarded to E. Carro. F. Wandosell was additionally supported from Direccion General de Ciencia y Tecnologia-DGCYT (SAF2009-12249-C02-01), EU-FP7-2009-CT222887, Fundación Ramón Areces, and CIBERNED (BESAD-P.2010). C. Spuch was supported by programmes from Xunta de Galicia (INCITE2009, and “Isidro Parga Pondal”). We thank Agnieszka Krzyzanowska, PhD, for the careful revision of this manuscript.
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Bolos, M., Spuch, C., Ordoñez-Gutierrez, L. et al. Neurogenic effects of β-amyloid in the choroid plexus epithelial cells in Alzheimer’s disease. Cell. Mol. Life Sci. 70, 2787–2797 (2013). https://doi.org/10.1007/s00018-013-1300-x
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DOI: https://doi.org/10.1007/s00018-013-1300-x


