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E-cadherin-mediated interactions of thymic epithelial cells with CD103+ thymocytes lead to enhanced thymocyte cell

Snjezana Kutlesa1, Johannes T Wessels, Angelika Speiser

  • 1University Medical Clinic, Section for Transplantation Immunology and Immunohematology, Tübingen, Germany.

Journal of Cell Science
|November 5, 2002
PubMed

Insights

E-cadherin on thymic epithelial cells interacts with CD103 on thymocytes, mediating cell adhesion and proliferation during T-cell development. This interaction is crucial for thymocyte development in the human thymus.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Cadherins are cell adhesion molecules mediating homotypic interactions.
  • E-cadherin, a specific cadherin, also engages in heterophilic interactions with integrin alpha(E)(CD103)beta(7).
  • The human thymus is a site where thymocytes develop in close proximity to thymic stromal cells.

Purpose of the Study:

  • To investigate the role of E-cadherin and its ligand CD103 in human thymocyte development.
  • To determine the specific interactions between thymic epithelial cells and thymocytes.
  • To elucidate the contribution of E-cadherin-CD103 interactions to thymocyte proliferation.

Main Methods:

  • Immunofluorescence staining to detect E-cadherin expression on thymic epithelial cells.
  • Flow cytometry to analyze CD103 expression on thymocytes.
  • In vitro cell adhesion assays using thymocytes and thymic epithelial cells.
  • Inhibition studies using antibodies against E-cadherin and CD103.

Main Results:

  • E-cadherin is expressed on human thymic epithelial cells, particularly in the medulla.
  • CD103 is expressed on early (double-negative) and mature (CD8 single-positive) thymocytes.
  • Thymocytes adhered to thymic epithelial cells, an interaction blocked by anti-E-cadherin or anti-CD103 antibodies.
  • CD103-E-cadherin interaction stimulated proliferation of CD8(+) thymocytes.

Conclusions:

  • E-cadherin on thymic epithelial cells and CD103 on thymocytes mediate heterophilic adhesion.
  • This adhesion interaction is critical for human thymocyte proliferation and development.
  • The E-cadherin-CD103 ligand pair plays a significant role in T-cell development within the thymus.

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