Cited by 682Hematopoietic Stem Cell TransplantationPI3K/AKT/mTOR signaling in cancerMesenchymal stem cell research

TSC-mTOR maintains quiescence and function of hematopoietic stem cells by repressing mitochondrial biogenesis and reactive oxygen species

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Chen, Chong, Liu, Yu, Liu, Runhua, Ikenoue, Tsuneo, Guan, Kun-Liang, Liu, Yang, Zheng, Pan·2008·The Journal of Experimental Medicine

Abstract

The tuberous sclerosis complex (TSC)-mammalian target of rapamycin (mTOR) pathway is a key regulator of cellular metabolism. We used conditional deletion of Tsc1 to address how quiescence is associated with the function of hematopoietic stem cells (HSCs). We demonstrate that Tsc1 deletion in the HSCs drives them from quiescence into rapid cycling, with increased mitochondrial biogenesis and elevated levels of reactive oxygen species (ROS). Importantly, this deletion dramatically reduced both hematopoiesis and self-renewal of HSCs, as revealed by serial and competitive bone marrow transplantation. In vivo treatment with an ROS antagonist restored HSC numbers and functions. These data demonstrated that the TSC-mTOR pathway maintains the quiescence and function of HSCs by repressing ROS production. The detrimental effect of up-regulated ROS in metabolically active HSCs may explain the well-documented association between quiescence and the "stemness" of HSCs.

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  • Signaling through the PTEN-AKT-mTOR pathway upstream of FoxO senses and controls ROS and regulates HSC self-renewal and survival.

    “A decline in long-term regeneration capacity of HSCs in mice with conditional deletion of phosphatase and tensin homolog (PTEN) and double deficiency of protein kinase B (AKT) 1 and 2 also indicates that signaling through the PTEN–AKT–mammalian target of rapamycin (mTOR) pathway, upstream of FoxO, senses and controls ROS and regulates HSC self-renewal and survival19–21.”
  • mTOR is a key controller of ROS levels and autophagy in HSCs.

    “For example, the mTOR pathway has been shown to be a major regulator of both ROS levels and autophagy in HSCs20,78,80, (Fig. 3).”
  • Increased mTOR activity can cause certain cells to undergo differentiation or senescence, thereby exiting the proliferative cell pool.

    “increased mTOR activity can also cause certain cells to undergo differentiation or senescence, thereby exiting the proliferative cell pool (Castilho et al., 2009; Chen et al., 2008; Lee et al., 2010; Liu et al., 2007; Zhang et al., 2006; reviewed in Iglesias-Bartolome and Gutkind, 2011).”

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Authors
Chen, C., Liu, Y., Liu, R., Ikenoue, T., Guan, K.-L., Liu, Y., & Zheng, P.
Affiliations
  • 1Program of Cell and Developmental Biology
  • 2Division of Immunotherapy, Department of Surgery
  • University of Michigan (US)
Venue
The Journal of Experimental Medicine
Published
2008-09-22
Volume
205
Issue
10
Pages
2397-2408
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2130202974
Cited by
682
References
51
Citations by year
2026: 18 · 2025: 16 · 2024: 25 · 2023: 25 · 2022: 36 · 2021: 44 · 2020: 37 · 2019: 44 · 2018: 47 · 2017: 37 · 2016: 48 · 2015: 42 · 2014: 57 · 2013: 62 · 2012: 40
FWCI
22.64
Type
journal article
Language
en
Open access
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Defense
  • American Cancer Society
  • University of Michigan
  • National Institutes of Health
  • University of Michigan Comprehensive Cancer Center
Topics
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
tuberous sclerosis complex, mTOR signaling, hematopoietic stem cells, stem cell quiescence, mitochondrial biogenesis, reactive oxygen species, hematopoiesis, self-renewal, stemness, bone marrow transplantation, cellular metabolism
MeSH terms
Tuberous Sclerosis Complex 1 Protein, Animals, Hematopoiesis, Hematopoietic Stem Cells, Immunosuppressive Agents, Mice, Inbred C57BL, Mitochondria, Mutation, Protein Kinases, Bone Marrow Transplantation, Reactive Oxygen Species, Mice, Knockout, Sirolimus, Tumor Suppressor Proteins, Cell Proliferation, Mice, TOR Serine-Threonine Kinases

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