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Related Experiment Videos

Mature T cells generated from single thymic clones are phenotypically and functionally heterogeneous.

G J Spangrude1, I L Weissman

  • 1Department of Pathology, Stanford University School of Medicine, CA 94305.

Journal of Immunology (Baltimore, Md. : 1950)
|September 15, 1988
PubMed
Summary

This study evaluates a limiting dilution system to track thymic colony-forming units (CFUt) from murine bone marrow, revealing their direct seeding to the thymus and lack of commitment to specific T cell functions.

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Area of Science:

  • Immunology
  • Hematopoiesis
  • Cell Biology

Background:

  • Thymic colony-forming units (CFUt) are crucial for T cell development.
  • Understanding the seeding and commitment of CFUt is essential for T cell biology.

Purpose of the Study:

  • To critically evaluate a limiting dilution system for cloning murine bone marrow CFUt.
  • To determine the clonal origin and seeding kinetics of thymic colonies.
  • To assess the commitment of CFUt to T cell lineage and function.

Main Methods:

  • Limiting dilution analysis of murine bone marrow cells.
  • Simultaneous transfer of differentially marked bone marrow populations.
  • Pulse-chase experiments to track CFUt seeding.
  • Kinetic analysis of CFUt progeny emigration.

Related Experiment Videos

  • Quantitation of T cell receptor (TCR) V beta 8 gene expression.
  • In vitro expansion and functional assays (cytotoxicity) of CFUt clones.

    • Main Results:

    • A limiting dilution system was validated, estimating 1 CFUt per 3.3 x 10^4 bone marrow cells.
    • CFUt directly seed to the thymus within 4 hours of intravenous infusion via specific endothelial cell interactions.
    • Progeny lymphocytes emerge around 4 weeks post-reconstitution, with initial waves being CD4+CD8- or CD4-CD8+.
    • CFUt progeny do not show stable commitment to specific cell surface phenotypes or TCR rearrangements.
    • A significant proportion (30-50%) of expanded CFUt clones exhibit lectin-dependent cytotoxicity, indicating functional plasticity.

    Conclusions:

    • Murine bone marrow CFUt seed directly to the thymus through specific endothelial interactions.
    • CFUt are not terminally committed to a specific T cell lineage or function upon initial seeding.
    • The evaluated limiting dilution system is a reliable tool for studying thymic progenitor cells and T cell development.