Cited by 51T-cell and B-cell ImmunologyHematopoietic Stem Cell TransplantationDevelopmental Biology and Gene Regulation

Cyclical mobilization and gated importation of thymocyte progenitors in the adult mouse: evidence for a thymus‐bone marrow feedback loop

Goldschneider, Irving·2006·Immunological Reviews

Abstract

Summary: It has recently been observed, as in the fetal thymus, that the importation of hematogenous thymocyte progenitors by the adult thymus is a gated phenomenon, whereby saturating numbers of progenitors periodically enter the thymus and occupy a finite number of intrathymic niches. In addition, the mobilization of thymocyte progenitors from the bone marrow appears to be a cyclical process that coincides temporally with the periods of thymic receptivity (open gate). It is proposed that these events are coordinated by a thymus‐bone marrow feedback loop in which a wave of developing triple negative (CD3–CD4–CD8–) thymocytes interacts with stromal cells in the stratified regions of the thymus cortex to sequentially induce the release of diffusible cytokines that regulate the production, mobilization, and recruitment of thymocyte progenitors. The likely components of this feedback loop are described here, as are the properties of the intrathymic vascular gates and niches for thymocyte progenitors. The cyclical production and release of thymocyte progenitors from the bone marrow is placed in the context of a general phenomenon of oscillatory feedback regulation involving all lymphohemopoietic cell lineages. Lastly, the question of whether the gated (as opposed to the continuous) entry of thymocyte progenitors is essential for normal thymocytopoiesis in adult life is discussed.

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Crossref · 10.1111/j.0105-2896.2006.00354.x

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  • The PU.1-high stages of thymocyte development are relatively obscure in the context of the whole thymus, yet their accurate regulation is crucial for establishment of immune system homeostasis and avoidance of leukemia.

    “The PU.1-high stages of thymocyte development are relatively obscure in the context of the whole thymus, yet their accurate regulation is crucial for establishment of immune system homeostasis and avoidance of leukemia (125, 126).”

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Authors
Goldschneider, I.
Affiliations
UConn Health (US)
Corresponding author
Goldschneider, Irving
Venue
Immunological Reviews
Publisher
Wiley
Published
2006-01-31
Volume
209
Issue
1
Pages
58-75
ISSN
  • 0105-2896 (ISSN-L)
  • 1600-065X
OpenAlex
W2137888459
Cited by
51
References
152
Citations by year
2026: 1 · 2025: 1 · 2023: 2 · 2022: 2 · 2021: 1 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 5
FWCI
0.38
Type
journal article
Language
en
Open access
closed
Locations
  • Immunological Reviews (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ai033741-23)
  • National Institute of Allergy and Infectious Diseases (AI-33741, R01AI060735, AI060735)
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
thymic stromal cells, adult thymus
MeSH terms
Animals, Bone Marrow Cells, Cell Communication, Cell Differentiation, Cell Movement, Hematopoietic Stem Cells, T-Lymphocytes, Thymus Gland, Cytokines, Stromal Cells, Models, Immunological, Feedback, Physiological, Lymphopoiesis, Cell Proliferation, Mice

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