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Related Experiment Videos

Stromal-derived factor 1 expression in the human thymus.

Marina Zaitseva1, Tatsuyoshi Kawamura, Rebecca Loomis

  • 1Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, and Dermatology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. zaitseva@cber.fda.gov

Journal of Immunology (Baltimore, Md. : 1950)
|March 9, 2002
PubMed
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Stromal-derived factor-1 (SDF-1) is expressed in thymic Hassall's corpuscles, attracting dendritic cells. This interaction aids in the elimination of apoptotic thymocytes, suggesting SDF-1's role in thymopoiesis.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Stromal-derived factor-1 (SDF-1) is a chemokine involved in immune cell migration.
  • SDF-1's role in thymopoiesis, the development of T-cells in the thymus, was previously unknown.
  • SDF-1 is the ligand for the chemokine receptor CXCR4.

Purpose of the Study:

  • To investigate the expression and function of SDF-1 in the human thymus.
  • To identify cells attracted by SDF-1 in the thymic medulla.
  • To elucidate the role of SDF-1 in thymocyte apoptosis and elimination.

Main Methods:

  • Immunohistochemistry to detect SDF-1 expression in thymic epithelial cells.
  • In situ analysis of dendritic cell (DC) localization relative to SDF-1 expressing cells.

Related Experiment Videos

  • Studies in HIV-1-infected SCID-hu mouse models to examine DC behavior and thymocyte apoptosis.
  • Flow cytometry to assess CXCR4 expression on DCs.

    • Main Results:

    • SDF-1 is expressed in medullar epithelial cells within Hassall's corpuscles (HC).
    • Dendritic cells (DCs) are found in close proximity to SDF-1-expressing epithelial cells in HC.
    • In HIV-1-infected thymuses, DCs within enlarged HC contained apoptotic cells.
    • Uptake of apoptotic thymocytes by immature DCs increased CXCR4 expression and SDF-1-mediated chemotaxis.

    Conclusions:

    • SDF-1 plays a role in attracting dendritic cells to Hassall's corpuscles.
    • SDF-1 signaling is involved in the clearance of apoptotic thymocytes by DCs.
    • These findings suggest a novel function for SDF-1 in regulating thymopoiesis and immune homeostasis within the thymus.