Cited by 167T-cell and B-cell ImmunologyHematopoietic Stem Cell TransplantationDevelopmental Biology and Gene Regulation

Kinetics of Steady-state Differentiation and Mapping of Intrathymic-signaling Environments by Stem Cell Transplantation in Nonirradiated Mice

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Porritt, Helen E., Gordon, Kristie, Petrie, Howard T.·2003·The Journal of Experimental Medicine

Abstract

Upon thymus entry, thymic-homing progenitors undergo distinct phases of differentiation as they migrate through the cortex to the capsule, suggesting that the signals that induce these differentiation steps may be stratified in corresponding cortical regions. To better define these regions, we transplanted purified stem cells into nonirradiated congenic recipients and followed their differentiation with respect to both tissue location and time. The earliest progenitors (DN1) remained confined to a very narrow region of the cortex for about the first 10 d of intrathymic residence; this region virtually overlaps the sites of thymic entry, suggesting that DN1 cells move very little during this lengthy period of proliferation and lineage commitment. Movement out of this region into the deeper cortex is asynchronous, and corresponds to the appearance of DN2 cells. Differentiation to the DN3 stage correlates with movement across the midpoint of the cortex, indicating that stromal signals that induce functions such as TCR gene rearrangement reside mainly in the outer half of the cortex. The minimum time to reach the capsule, and thus transit to the DP stage, is ∼13 d, with the average time a few days longer. These findings reveal for the first time the kinetics of steady-state progenitor differentiation in the thymus, as well as defining the boundaries of cortical regions that support different phases of the differentiation process. We also show that the first lineage-positive progeny of transplanted stem cells to appear in the thymus are dendritic cells in the medulla, suggesting that each new wave of new T cell production is preceded by a wave of regulatory cells that home to the medulla and ensure efficient tolerance and selection.

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  • PU.1 activity probably extends for over 10 days for thymocytes in young adult mice, where it is crucial for successful T-cell generation.

    “It probably extends for over 10 days for the thymocytes in young adult mice (153), where it is crucial for successful T-cell generation (2, 147).”

    From Mechanisms of Action of Hematopoietic Transcription Factor PU.1 in Initiation of T-Cell Development (2019) · cites this paper as [153]

    The Results and Discussion (page unavailable) report that thymic progenitors take about 15 days to reach the double-positive stage, supporting a developmental interval longer than 10 days. The paper does not establish that PU.1 remains active throughout that interval. The statement about PU.1 being crucial for T-cell generation is attached to other citations, not this one. (LLM, conf=0.85)

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Authors
Porritt, H. E., Gordon, K., & Petrie, H. T.
Affiliations
Memorial Sloan Kettering Cancer Center (US)
Corresponding author
Gordon, Kristie
Venue
The Journal of Experimental Medicine
Published
2003-09-15
Volume
198
Issue
6
Pages
957-962
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2099130754
Cited by
167
References
26
Citations by year
2026: 1 · 2025: 8 · 2024: 6 · 2023: 4 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 6 · 2018: 8 · 2017: 8 · 2016: 4 · 2015: 5 · 2014: 7 · 2013: 5 · 2012: 7
FWCI
3.90
Type
journal article
Language
en
Open access
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • Memorial Sloan-Kettering Cancer Center
  • Oklahoma Medical Research Foundation
  • National Cancer Institute (CA08748, P30CA008748)
  • National Institute of Allergy and Infectious Diseases (R21AI033940, R56AI033940, R01AI033940, AI 33940, R29AI033940)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
thymocyte differentiation, thymus, thymic cortex, thymic medulla, T-cell receptor gene rearrangement, dendritic cells, regulatory T cells, thymic selection, congenic mice
MeSH terms
Animals, Cell Differentiation, Cell Movement, Dendritic Cells, Hematopoietic Stem Cells, Mice, Inbred C57BL, T-Lymphocytes, Thymus Gland, Signal Transduction, Transplantation Chimera, Stem Cell Transplantation, Mice

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