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Thymocyte-dendritic cell interactions near sources of CCR7 ligands in the thymic cortex

Ena Ladi1, Tanja A Schwickert, Tatyana Chtanova

  • 1Division of Immunology, Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|November 5, 2008
PubMed

Insights

Thymocytes frequently interact with dendritic cells (DCs) in the mouse thymus cortex during positive selection. This interaction is regulated by chemokine receptor CCR7 and occurs in a vasculature-associated microenvironment.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • The dynamics of thymocyte interactions and their distribution during positive selection in the thymic cortex are poorly understood.
  • Understanding these interactions is crucial for T cell development and immune system function.

Purpose of the Study:

  • To investigate the spatiotemporal dynamics of thymocyte and dendritic cell (DC) interactions in the mouse thymus cortex during positive selection.
  • To identify the cellular and molecular mechanisms governing these interactions.

Main Methods:

  • Utilized two-photon laser scanning microscopy to visualize thymocytes and DCs in the mouse thymus.
  • Analyzed DC-thymocyte contacts and the role of chemokine receptor CCR7 and its ligand CCL21.

Main Results:

  • Thymocytes form frequent contacts with DCs in the thymic cortex, which increase during positive selection.
  • Cortical DCs and CCL21 expression are associated with capillaries, forming a vasculature-associated microenvironment.
  • CCR7 overexpression enhances DC-thymocyte interactions, while CCR7 loss reduces them in the context of positive selection.

Conclusions:

  • A vasculature-associated microenvironment in the thymic cortex facilitates DC-thymocyte interactions crucial for positive selection.
  • Chemokine receptor CCR7 and its ligand CCL21 play a significant role in regulating these essential immune cell interactions.

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