Cited by 60T-cell and B-cell ImmunologyDevelopmental Biology and Gene RegulationGenomics and Chromatin Dynamics

Enforced Expression of Spi-B Reverses T Lineage Commitment and Blocks β-Selection

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Lefebvre, Juliette M, Haks, Mariëlle C, Carleton, Michael O, Rhodes, Michele, Sinnathamby, Gomathinayagam, Simon, M Celeste, Eisenlohr, Laurence C, Garrett-Sinha, Lee Ann +1 more·2005·The Journal of Immunology

Abstract

The molecular changes that restrict multipotent murine thymocytes to the T cell lineage and render them responsive to Ag receptor signals remain poorly understood. In this study, we report our analysis of the role of the Ets transcription factor, Spi-B, in this process. Spi-B expression is acutely induced coincident with T cell lineage commitment at the CD4−CD8−CD44−CD25+ (DN3) stage of thymocyte development and is then down-regulated as thymocytes respond to pre-TCR signals and develop beyond the β-selection checkpoint to the CD4−CD8−CD44−CD25− (DN4) stage. We found that dysregulation of Spi-B expression in DN3 thymocytes resulted in a dose-dependent perturbation of thymocyte development. Indeed, DN3 thymocytes expressing approximately five times the endogenous level of Spi-B were arrested at the β-selection checkpoint, due to impaired induction of Egr proteins, which are important molecular effectors of the β-selection checkpoint. T lineage-committed DN3 thymocytes expressing even higher levels of Spi-B were diverted to the dendritic cell lineage. Thus, we demonstrate that the prescribed modulation of Spi-B expression is important for T lineage commitment and differentiation beyond the β-selection checkpoint; and we provide insight into the mechanism underlying perturbation of development when that expression pattern is disrupted.

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Crossref · 10.4049/jimmunol.174.10.6184

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  • Re-expression of PU.1 after T-cell commitment turns on myeloid genes and can transform later pro-T cells into dendritic cells, macrophages, or promyelocytic-like cells.

    “re-expression of PU.1 after T-cell commitment turns on myeloid genes and readily transforms later pro-T cells into dendritic cells, macrophages, or promyelocytic-like cells (46–50).”

    From Mechanisms of Action of Hematopoietic Transcription Factor PU.1 in Initiation of T-Cell Development (2019) · cites this paper as [48]

    The organ-culture results (page not available) report that PU.1 expression induced a dendritic-cell marker and diverted thymocytes toward that lineage, but identify the affected DN1–DN2 cells as not yet committed to the T-cell lineage. The Discussion attributes diversion of committed DN3 cells to Spi-B, not PU.1. The paper does not establish that PU.1 re-expression in later committed pro-T cells activates myeloid genes or produces macrophages or promyelocytic-like cells. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Instead of re-acquiring a progenitor-like state, cells appear to trans-differentiate to a dendritic-cell or macrophage developmental program.

    “Instead of re-acquiring aspects of a progenitor-like state, the cells appear to trans-differentiate to a dendritic-cell or macrophage developmental program (48, 50, 58).”

    From Mechanisms of Action of Hematopoietic Transcription Factor PU.1 in Initiation of T-Cell Development (2019) · cites this paper as [48]

    The section on stage-dependent effects reports that Spi-B-transduced, T-lineage-committed DN3 thymocytes up-regulated a dendritic-cell marker, consistent with diversion to the dendritic-cell lineage. But it also reports that some re-expressed CD44 and reverted to a DN2 phenotype, so it does not establish diversion *instead of* reacquiring progenitor-like features. The paper does not report diversion to a macrophage program. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Authors
Lefebvre, J. M., Haks, M. C., Carleton, M. O., Rhodes, M., Sinnathamby, G., Simon, M. C., Eisenlohr, L. C., Garrett-Sinha, L. A., & Wiest, D. L.
Affiliations
  • Fox Chase Cancer Center (US)
  • Immunobiology Working Group, Division of Basic Sciences, Fox Chase Cancer Center , Philadelphia, PA 19111
  • Thomas Jefferson University (US)
  • Howard Hughes Medical Institute (US)
  • Department of Biochemistry, State University of New York , Buffalo, NY 14214
Corresponding author
Rhodes, Michele
Venue
The Journal of Immunology
Published
2005-05
Volume
174
Issue
10
Pages
6184-6194
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1500023054
Cited by
60
References
74
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 2 · 2013: 6
FWCI
2.25
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Cancer Research Institute
  • National Institutes of Health (50306, 5r29ca073656-03, P01 CA06927)
  • National Cancer Institute (P01 CA06927, CA 73656, CA 87407)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK50306, P30DK050306)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
Spi-B, ETS transcription factors, T cell lineage commitment, T cell development, Egr transcription factors, pre-TCR signaling, dendritic cell differentiation, thymic selection
MeSH terms
Proto-Oncogene Protein Spi-1, Animals, Cell Differentiation, Dendritic Cells, DNA-Binding Proteins, Humans, Mice, Inbred C57BL, Organ Culture Techniques, Proto-Oncogene Proteins, Thymoma, Thymus Gland, Thymus Neoplasms, Transcription Factors, Transduction, Genetic, Trans-Activators, Down-Regulation, T-Lymphocyte Subsets, Mice, SCID, Mice, Knockout, Cell Lineage, Genes, T-Cell Receptor beta, Cell Line, Tumor, Fetal Development, Mice

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