Period 2 Regulates Neural Stem/progenitor Cell Proliferation in the Adult Hippocampus

Overview

Journal BMC Neurosci

Publisher Biomed Central

Specialty Neurology

Date 2009 Mar 31

PMID 19327139

Citations 36

Authors

Laurence Borgs

Pierre Beukelaers

Renaud Vandenbosch

Laurent Nguyen

Gustave Moonen

Pierre Maquet

Urs Albrecht

Shibeshih Belachew

Brigitte Malgrange

Affiliations

Soon will be listed here.

Abstract

Background: Newborn granule neurons are generated from proliferating neural stem/progenitor cells and integrated into mature synaptic networks in the adult dentate gyrus of the hippocampus. Since light/dark variations of the mitotic index and DNA synthesis occur in many tissues, we wanted to unravel the role of the clock-controlled Period2 gene (mPer2) in timing cell cycle kinetics and neurogenesis in the adult DG.

Results: In contrast to the suprachiasmatic nucleus, we observed a non-rhythmic constitutive expression of mPER2 in the dentate gyrus. We provide evidence that mPER2 is expressed in proliferating neural stem/progenitor cells (NPCs) and persists in early post-mitotic and mature newborn neurons from the adult DG. In vitro and in vivo analysis of a mouse line mutant in the mPer2 gene (Per2Brdm1), revealed a higher density of dividing NPCs together with an increased number of immature newborn neurons populating the DG. However, we showed that the lack of mPer2 does not change the total amount of mature adult-generated hippocampal neurons, because of a compensatory increase in neuronal cell death.

Conclusion: Taken together, these data demonstrated a functional link between the constitutive expression of mPER2 and the intrinsic control of neural stem/progenitor cells proliferation, cell death and neurogenesis in the dentate gyrus of adult mice.

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