Cited by 1,339Hematopoietic Stem Cell TransplantationMesenchymal stem cell researchBlood disorders and treatments

Hematopoietic Stem Cell Quiescence Maintained by p21 cip1/waf1

Cheng, Tao, Rodrigues, Neil, Shen, Hongmei, Yang, Yong-guang, Dombkowski, David, Sykes, Megan, Scadden, David T.·2000·Science

Abstract

Relative quiescence is a defining characteristic of hematopoietic stem cells, while their progeny have dramatic proliferative ability and inexorably move toward terminal differentiation. The quiescence of stem cells has been conjectured to be of critical biologic importance in protecting the stem cell compartment, which we directly assessed using mice engineered to be deficient in the G 1 checkpoint regulator, cyclin-dependent kinase inhibitor, p21 cip1/waf1 (p21). In the absence of p21, hematopoietic stem cell proliferation and absolute number were increased under normal homeostatic conditions. Exposing the animals to cell cycle–specific myelotoxic injury resulted in premature death due to hematopoietic cell depletion. Further, self-renewal of primitive cells was impaired in serially transplanted bone marrow from p21 −/− mice, leading to hematopoietic failure. Therefore, p21 is the molecular switch governing the entry of stem cells into the cell cycle, and in its absence, increased cell cycling leads to stem cell exhaustion. Under conditions of stress, restricted cell cycling is crucial to prevent premature stem cell depletion and hematopoietic death.

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Crossref · 10.1126/science.287.5459.1804

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35 of 35 references verified0 citation errors · 0 not checkable

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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 [65]

  • 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.”
  • 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.”

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Authors
Cheng, T., Rodrigues, N., Shen, H., Yang, Y.-G., Dombkowski, D., Sykes, M., & Scadden, D. T.
Affiliations
  • Harvard University (US)
  • Massachusetts General Hospital (US)
Corresponding author
Scadden, David T.
Venue
Science
Published
2000-03-10
Volume
287
Issue
5459
Pages
1804-1808
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2093958228
Cited by
1,339
References
35
Citations by year
2026: 13 · 2025: 19 · 2024: 18 · 2023: 26 · 2022: 35 · 2021: 34 · 2020: 28 · 2019: 33 · 2018: 32 · 2017: 33 · 2016: 48 · 2015: 57 · 2014: 58 · 2013: 74 · 2012: 63
FWCI
22.85
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01HL044851, HL44851)
  • National Institute of Allergy and Infectious Diseases (AI 07387, T32AI007387)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK50234, R01DK050234)
Topics
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Blood disorders and treatments
Keywords
hematopoietic stem cells, stem cell quiescence, p21, cyclin-dependent kinase inhibitors, G1/S checkpoint, stem cell self-renewal, stem cell proliferation, myelosuppression, hematopoietic failure, stem cell exhaustion, bone marrow transplantation
MeSH terms
Animals, Antimetabolites, Blood Cell Count, Cell Count, Cell Cycle, Cell Differentiation, Cell Division, Colony-Forming Units Assay, Female, Fluorouracil, Hematopoiesis, Hematopoietic Stem Cells, Homeostasis, Male, Mice, Inbred Strains, Bone Marrow Transplantation, Cyclins, Cell Death, Coculture Techniques, Cyclin-Dependent Kinase Inhibitor p21, Mice

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