Cited by 298Hematopoietic Stem Cell TransplantationAcute Myeloid Leukemia ResearchBlood disorders and treatments

PU.1 regulates the commitment of adult hematopoietic progenitors and restricts granulopoiesis

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Dakic, Aleksandar, Metcalf, Donald, Di Rago, Ladina, Mifsud, Sandra, Wu, Li, Nutt, Stephen L.·2005·The Journal of Experimental Medicine

Abstract

Although the transcription factor PU.1 is essential for fetal lymphomyelopoiesis, we unexpectedly found that elimination of the gene in adult mice allowed disturbed hematopoiesis, dominated by granulocyte production. Impaired production of lymphocytes was evident in PU.1-deficient bone marrow (BM), but myelocytes and clonogenic granulocytic progenitors that are responsive to granulocyte colony-stimulating factor or interleukin-3 increased dramatically. No identifiable common lymphoid or myeloid progenitor populations were discernable by flow cytometry; however, clonogenic assays suggested an overall increased frequency of blast colony-forming cells and BM chimeras revealed existence of long-term self-renewing PU.1-deficient cells that required PU.1 for lymphoid, but not granulocyte, generation. PU.1 deletion in granulocyte-macrophage progenitors, but not in common myeloid progenitors, resulted in excess granulocyte production; this suggested specific roles of PU.1 at different stages of myeloid development. These findings emphasize the distinct nature of adult hematopoiesis and reveal that PU.1 regulates the specification of the multipotent lymphoid and myeloid compartments and restrains, rather than promotes, granulopoiesis.

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Crossref · 10.1084/jem.20050075

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  • PU.1 is pivotal for normal hematopoiesis and directs differentiation of hematopoietic progenitors to macrophage, granulocyte, or B cell lineages.

    “Ets family transcription factor PU.1 is pivotal for normal hematopoiesis as it directs differentiation of hematopoietic progenitors to different cell lineages such as macrophage, granulocyte or B cell (1).”

    From FBW7 Inhibits Myeloid Differentiation in Acute Myeloid Leukemia via GSK3-Dependent Ubiquitination of PU.1 (2021) · cites this paper as [1]

    The Abstract and Discussion (page not provided) support PU.1’s importance in hematopoiesis and its role in progenitor commitment, including pathways leading to B cells and macrophages. But the paper does not describe PU.1 as simply directing progenitors toward all three listed lineages: it reports that loss of PU.1 enhances granulocyte production in adults, while PU.1 helps restrict that production and supports later granulocyte maturation. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • In preleukemic states (e.g., MDS), PU.1 downregulation permits clonal expansion.

    “In preleukemic states (e.g., MDS), where PU.1 downregulation permits clonal expansion 33-35”

    From USP7 sustains hematopoietic stem cell homeostasis partially via PU.1 stabilization (2026) · cites this paper as [35]

    The Results and Discussion (page not provided) show that PU.1 loss in mice expanded granulocytic progenitors, and the Discussion describes a related preleukemic mouse model with reduced PU.1 expression. The paper does not establish that PU.1 downregulation permits clonal expansion in MDS; its observed progenitor expansion is not identified as clonal expansion. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • PU.1 is indispensable for HSC function and the differentiation of cells within the myeloid and lymphoid lineages.

    “One such master regulator is the Ets-family transcription factor PU.1, which is indispensable for HSC function and the differentiation of cells within the myeloid as well as lymphoid lineages3–5.”

    From Minimal PU.1 reduction induces a preleukemic state and promotes development of acute myeloid leukemia (2015) · cites this paper as [4]

    The Discussion (page unavailable) reports loss of long-term self-renewing hematopoietic activity and de novo lymphopoiesis after PU.1 deletion, supporting its importance for HSC function and lymphoid development. But the Results report enhanced granulocyte differentiation without PU.1, so the paper does not support an unqualified claim that PU.1 is indispensable for differentiation throughout the myeloid lineage. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • PU.1 action is important or indispensable for sustained generation of all known hematopoietic precursors with lymphoid developmental potentials.

    “its action is also important or indispensable for sustained generation of all known hematopoietic precursors that have lymphoid developmental potentials (1–9).”

    From Mechanisms of Action of Hematopoietic Transcription Factor PU.1 in Initiation of T-Cell Development (2019) · cites this paper as [2]

    The Results section (‘PU.1 is required for the balanced production of multipotent bone marrow progenitors’; page unavailable) reports a dramatic loss of readily identifiable lymphoid progenitors after PU.1 deletion in adult mice. The Results section (‘PU.1-deficient stem cells do not generate lymphoid progeny’; page unavailable) also reports that deficient progenitors essentially could not contribute to B- or T-cell production. These findings support PU.1’s importance in the studied adult setting, but do not establish a requirement for the sustained generation of every known hematopoietic precursor with lymphoid potential. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • All hematopoietic progenitors that generate B or T cells appear to originate from PU.1-expressing, PU.1-dependent prethymic cells.

    “All the hematopoietic progenitors that generate either B or T cells appear to originate from PU.1-expressing, PU.1-dependent prethymic cells (2, 27)”

    From Mechanisms of Action of Hematopoietic Transcription Factor PU.1 in Initiation of T-Cell Development (2019) · cites this paper as [2]

    The expression passage provided (p. unavailable) says PU.1 is expressed in adult hematopoietic stem cells and the earliest lymphoid progenitors. The Results section, “PU.1-deficient stem cells do not generate lymphoid progeny” (p. unavailable), reports that PU.1-deficient progenitors essentially could not contribute to B- or T-cell production, supporting an early PU.1-dependent origin. The paper studies adult mice and does not establish that *all* B- or T-cell-generating progenitors, across settings, pass through such cells. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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Authors
Dakic, A., Metcalf, D., Di Rago, L., Mifsud, S., Wu, L., & Nutt, S. L.
Affiliations
  • Walter and Eliza Hall Institute of Medical Research (AU)
  • The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3050, Australia
Venue
The Journal of Experimental Medicine
Published
2005-05-02
Volume
201
Issue
9
Pages
1487-1502
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2136610354
Cited by
297
References
51
Citations by year
2026: 4 · 2025: 4 · 2024: 15 · 2023: 13 · 2022: 6 · 2021: 9 · 2020: 7 · 2019: 12 · 2018: 13 · 2017: 17 · 2016: 9 · 2015: 18 · 2014: 15 · 2013: 26 · 2012: 21
FWCI
10.47
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc-sa)
Funders
  • National Institutes of Health (CA22556)
  • Medical Research Council
  • National Health and Medical Research Council
  • Cancer Council Victoria
  • National Cancer Institute (R37CA022556, CA22556, R01CA022556)
Topics
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Health Sciences › Medicine › Hematology › Acute Myeloid Leukemia Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Blood disorders and treatments
Keywords
PU.1, granulopoiesis, hematopoietic progenitor cells, CFU-GM, common myeloid progenitors, lymphocyte production, granulocyte colony-stimulating factor, interleukin-3, bone marrow chimeras, transcription factors, adult hematopoiesis
MeSH terms
Proto-Oncogene Protein Spi-1, Animals, Antibodies, Monoclonal, Blood Cell Count, Cell Differentiation, Cells, Cultured, Colony-Forming Units Assay, Flow Cytometry, Genetic Vectors, Genotype, Granulocytes, Hematopoietic Stem Cells, Mice, Inbred C57BL, Mice, Transgenic, Proto-Oncogene Proteins, Blotting, Western, Trans-Activators, DNA Primers, Reverse Transcriptase Polymerase Chain Reaction, Myeloid Cells, Green Fluorescent Proteins, Mice

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