TGF-beta signalling in the adult neurogenic niche promotes stem cell quiescence as well as generation of new neurons

Kandasamy, Mahesh; Lehner, Bernadette; Kraus, Sabrina; Sander, Paul Ramm; Marschallinger, Julia; Rivera, Francisco J.; Truembach, Dietrich; Ueberham, Uwe; Reitsamer, Herbert A.; Strauss, Olaf; Bogdahn, Ulrich; Couillard-Despres, Sebastien; Aigner, Ludwig


Members of the transforming growth factor (TGF)- family govern a wide range of mechanisms in brain development and in the adult, in particular neuronal/glial differentiation and survival, but also cell cycle regulation and neural stem cell maintenance. This clearly created some discrepancies in the field with some studies favouring neuronal differentiation/survival of progenitors and others favouring cell cycle exit and neural stem cell quiescence/maintenance. Here, we provide a unifying hypothesis claiming that through its regulation of neural progenitor cell (NPC) proliferation, TGF- signalling might be responsible for (i) maintaining stem cells in a quiescent stage, and (ii) promoting survival of newly generated neurons and their functional differentiation. Therefore, we performed a detailed histological analysis of TGF-1 signalling in the hippocampal neural stem cell niche of a transgenic mouse that was previously generated to express TGF-1 under a tetracycline regulatable Ca-Calmodulin kinase promoter. We also analysed NPC proliferation, quiescence, neuronal survival and differentiation in relation to elevated levels of TGF-1 in vitro and in vivo conditions. Finally, we performed a gene expression profiling to identify the targets of TGF-1 signalling in adult NPCs. The results demonstrate that TGF-1 promotes stem cell quiescence on one side, but also neuronal survival on the other side. Thus, considering the elevated levels of TGF-1 in ageing and neurodegenerative diseases, TGF-1 signalling presents a molecular target for future interventions in such conditions.

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Título según WOS: ID WOS:000340413500019 Not found in local WOS DB
Volumen: 18
Número: 7
Editorial: Wiley
Fecha de publicación: 2014
Página de inicio: 1444
Página final: 1459


Notas: ISI