Increased p27Kip1 protein expression in the dentate gyrus of chronically stressed rats indicates G(1) arrest involvement

VM Heine*, S Maslam, M Joels, PJ Lucassen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

43 Citations (Scopus)

Abstract

Various chronic stress paradigms decrease new cell proliferation in the hippocampal dentate gyrus, yet the exact underlying mechanism is still unclear. In the first gap (G,) phase of the cell cycle, both stimulatory and inhibitory signals derived from the extracellular environment converge. Corticosteroids, which increase during stress and are well-known anti-mitotics, cause cells in vitro to arrest in the G, phase. Following 3 weeks of unpredictable stress, we therefore expected a change in protein expression of various important G, cell cycle regulators in the adult rat subgranular zone. Using quantitative immunocytochemistry, we show that particularly cyclin-dependent kinase inhibitor p27Kip1 expression is significantly increased. In addition, 3 weeks of recovery after stress normalized the numbers of p27Kip1-expressing cells, consistent with the recovered adult cell proliferation in these animals. P27Kip1-positive cells do not overlap with GFAP-staining and only to a limited extent with Ki-67-expressing cells. Numbers of cyclin E- and cyclin D-1-expressing cells did not change after chronic stress. These results indicate that chronic stress causes cycling cells in the adult hippocampus to arrest in G(1), thereby providing more mechanistic insight in the stress-induced decrease in cell proliferation. (C) 2004 IBRO. Published by Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)593-601
Number of pages9
JournalNeuroscience
Volume129
Issue number3
DOIs
Publication statusPublished - 2004
Externally publishedYes

Keywords

  • hippocampus
  • neurogenesis
  • corticosteroids
  • cell cycle
  • cyclin
  • DEPENDENT KINASE INHIBITOR
  • CELL-CYCLE ARREST
  • CHRONIC PSYCHOSOCIAL STRESS
  • CENTRAL-NERVOUS-SYSTEM
  • GROWTH-FACTOR-BETA
  • RESTRICTION POINT
  • PROGENITOR CELLS
  • GENE-EXPRESSION
  • CDK INHIBITORS
  • IN-VIVO

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