PreprintCited by 442Neurogenesis and neuroplasticity mechanismsDevelopmental Biology and Gene RegulationHair Growth and Disorders

p21 loss compromises the relative quiescence of forebrain stem cell proliferation leading to exhaustion of their proliferation capacity

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Kippin, Tod E., Martens, David J., van der Kooy, Derek·2005·Genes & Development

Abstract

Adult stem cells in various tissues are relatively quiescent. The cell cycle inhibitor p21 cip1/waf1 (p21) has been shown to be important for maintaining hematopoietic stem cell quiescence and self-renewal. We examined the role of p21 in the regulation of adult mammalian forebrain neural stem cells (NSCs). We found that p21-/- mice between post-natal age 60-240 d have more NSCs than wild-type (+/+) controls due to higher proliferation rates of p21-/- NSCs. Thereafter, NSCs in p21-/- mice decline and are reduced in number at 16 mo relative to p21+/+ mice. Similarly, both p21-/- and p21+/+ NSCs display self-renewal in vitro; however, p21-/- NSCs display limited in vitro self-renewal (surviving a few passages, then exhausting). Thus, p21 contributes to adult NSC relative quiescence, which we propose is necessary for the life-long maintenance of NSC self-renewal because NSCs may be limited to a finite number of divisions.

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  • Reduced quiescent stem cells in p21-deficient cells correlates with impaired self-renewal and eventual stem cell pool exhaustion.

    “The reduced number of quiescent stem cells correlates with impaired self-renewal capacity of p21-deficient cells, which ultimately results in an exhaustion of the stem cell pool65,72.”

    From Molecular regulation of stem cell quiescence (2013) · cites this paper as [72]

  • When cell cycle control is lost, too much proliferation speeds up depletion of these stem cell pools.

    “Excessive proliferation caused by loss of cell cycle regulation results in accelerated exhaustion of these stem cell pools.”
  • Stem cell exhaustion may be driven by an imbalance between quiescence and proliferation.

    “Stem cell exhaustion may also be driven by an imbalance of stem cell quiescence and proliferation.”
  • A proper quiescence-proliferation balance is needed to keep the stem cell pool available for repeated tissue regeneration, as shown in Drosophila intestine, HSCs and p21-null neural stem cells.

    “Maintaining this balance is crucial to sustain the stem cell pool through multiple rounds of tissue regeneration, as demonstrated by studies in the Drosophila intestine, and in HSCs and neural stem cells of p21-null mice109,130,131.”

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  1. Coggeshall, R.E. and Lekan, H.A. 1996. Methods for determining numbers of cells and synapses: A case for more uniform standards or review. J. Comp. Neurol. 364: 6-15.

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Authors
Kippin, T. E., Martens, D. J., & van der Kooy, D.
Affiliations
University of Toronto (CA)
Venue
Genes & Development
Published
2005-03-15
Volume
19
Issue
6
Pages
756-767
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2169160857
Cited by
442
References
52
Citations by year
2026: 5 · 2025: 5 · 2024: 11 · 2023: 18 · 2022: 8 · 2021: 23 · 2020: 17 · 2019: 24 · 2018: 22 · 2017: 20 · 2016: 23 · 2015: 27 · 2014: 36 · 2013: 32 · 2012: 29
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Health Sciences › Medicine › Urology › Hair Growth and Disorders
Keywords
p21, neural stem cells, forebrain, stem cell quiescence, self-renewal, cell proliferation, stem cell exhaustion, cell cycle inhibitors, p21 knockout mice
MeSH terms
Analysis of Variance, Animals, Bromodeoxyuridine, Cell Count, Cell Cycle, Flow Cytometry, Hematopoietic Stem Cells, Immunohistochemistry, Mice, Mutant Strains, Microscopy, Fluorescence, Prosencephalon, Apoptosis, Cell Cycle Proteins, Cell Proliferation, Cyclin-Dependent Kinase Inhibitor p21, Mice

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