title: p57 controls adult neural stem cell quiescence and modulates the pace of lifelong neurogenesis.
abstract: Throughout life, neural stem cells (NSCs) in the adult hippocampus persistently generate new neurons that modify the neural circuitry. Adult NSCs constitute a relatively quiescent cell population but can be activated by extrinsic neurogenic stimuli. However, the molecular mechanism that controls such reversible quiescence and its physiological significance have remained unknown. Here, we show that the cyclin-dependent kinase inhibitor p57(kip2) (p57) is required for NSC quiescence. In addition, our results suggest that reduction of p57 protein in NSCs contributes to the abrogation of NSC quiescence triggered by extrinsic neurogenic stimuli such as running. Moreover, deletion of p57 in NSCs initially resulted in increased neurogenesis in young adult and aged mice. Long-term p57 deletion, on the contrary, led to NSC exhaustion and impaired neurogenesis in aged mice. The regulation of NSC quiescence by p57 might thus have important implications for the short-term (extrinsic stimuli-dependent) and long-term (age-related) modulation of neurogenesis.
authors.affiliation: Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Furutachi
authors.forename: Akinobu
authors.initials: A
authors.lastname: Matsumoto
authors.forename: Keiichi I
authors.initials: KI
authors.lastname: Nakayama
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Gotoh
mesh_terms: D053687:Adult Stem Cells / Q000166:cytology / Q000378:metabolism*; D000375:Aging / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D050761:Cyclin-Dependent Kinase Inhibitor p57 / Q000235:genetics / Q000378:metabolism*; D017353:Gene Deletion; D051379:Mice; D018345:Mice, Knockout; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D058953:Neural Stem Cells / Q000166:cytology / Q000378:metabolism*; D055495:Neurogenesis / Q000502:physiology*
chemical_list: C493965:Cdkn1c protein, mouse; D050761:Cyclin-Dependent Kinase Inhibitor p57; D009419:Nerve Tissue Proteins