Cell cycle heterogeneity directs the timing of neural stem cell activation from quiescence
Quiescent stem cells in adult tissues can be activated for homeostasis or repair. Neural stem cells (NSCs) in are reactivated from quiescence in response to nutrition by the insulin signaling pathway. It is widely accepted that quiescent stem cells are arrested in G In this study, however, we demons...
Gespeichert in:
Veröffentlicht in: | Science (American Association for the Advancement of Science) 2018-04, Vol.360 (6384), p.99-102 |
---|---|
Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Quiescent stem cells in adult tissues can be activated for homeostasis or repair. Neural stem cells (NSCs) in
are reactivated from quiescence in response to nutrition by the insulin signaling pathway. It is widely accepted that quiescent stem cells are arrested in G
In this study, however, we demonstrate that quiescent NSCs (qNSCs) are arrested in either G
or G
G
-G
heterogeneity directs NSC behavior: G
qNSCs reactivate before G
qNSCs. In addition, we show that the evolutionarily conserved pseudokinase Tribbles (Trbl) induces G
NSCs to enter quiescence by promoting degradation of Cdc25
and that it subsequently maintains quiescence by inhibiting Akt activation. Insulin signaling overrides repression of Akt and silences
transcription, allowing NSCs to exit quiescence. Our results have implications for identifying and manipulating quiescent stem cells for regenerative purposes. |
---|---|
ISSN: | 0036-8075 1095-9203 |
DOI: | 10.1126/science.aan8795 |