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Related Experiment Videos

L-selectin expression on thymic emigrants defines two distinct tissue-migration pathways.

J E Holder1, W G Kimpton, E A Washington

  • 1Laboratory for Foetal and Neonatal Immunology, The University of Melborne, Parkville, Victoria, Australia.

Immunology
|December 3, 1999
PubMed
Summary

Recent thymic emigrants show distinct phenotypes and homing receptor expression in lambs. Spleen-homing T cells, unlike lymph node-homing cells, often lack L-selectin, suggesting unique migration pathways.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • Recent thymic emigrants (RTEs) are T cells recently exported from the thymus.
  • Understanding RTE homing is crucial for adaptive immunity.
  • Lambs provide a valuable model for studying T cell development and migration.

Purpose of the Study:

  • To investigate the phenotype and homing receptor expression of RTEs in neonatal lamb blood, spleen, and lymph nodes.
  • To compare the migration patterns of T cell subsets to different lymphoid organs.
  • To explore the role of L-selectin in RTE homing to the spleen versus lymph nodes.

Main Methods:

  • In situ labeling of thymocytes with fluoroscein isothiocyanate (FITC).
  • Flow cytometric analysis of RTEs in blood, spleen, and lymph nodes.

Related Experiment Videos

  • Assessment of L-selectin expression on alphabeta and gammadelta T cell receptor (TCR+) subsets.

    • Main Results:

    • Significant differences observed in the proportions of CD4+, CD8+, and gammadelta TCR+ RTEs exported to spleen versus lymph nodes.
    • Spleen showed enrichment of CD8+ and gammadelta TCR+ RTEs, while lymph nodes were enriched in CD4+ RTEs.
    • RTEs homing to lymph nodes predominantly expressed L-selectin, whereas a considerably lower proportion of spleen-homing RTEs expressed L-selectin.

    Conclusions:

    • RTEs exhibit distinct phenotypic profiles and homing receptor expression depending on their destination organ (spleen vs. lymph nodes).
    • The low expression of L-selectin on spleen-homing RTEs suggests unique homing receptor specificities for splenic T cell migration.
    • These findings highlight differential migration strategies for T cells entering circulation via the spleen compared to lymph nodes.