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Delta-like 4 is indispensable in thymic environment specific for T cell development.

Katsuto Hozumi1, Carolina Mailhos, Naoko Negishi

  • 1Department of Immunology and Research Center for Embryogenesis and Organogenesis, Tokai University School of Medicine, Isehara 259-1193, Japan. hozumi@is.icc.u-tokai.ac.jp

The Journal of Experimental Medicine
|October 1, 2008
PubMed
Summary

The thymus requires Delta-like 4 (Dll4) expression on thymic epithelial cells to initiate Notch signaling, which is crucial for T cell development. This signaling pathway is essential for generating T cell progenitors within the thymus.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Signaling

Background:

  • T cell development is essential for adaptive immunity and typically occurs within the thymic microenvironment.
  • In vitro studies suggest Notch signaling, particularly via Delta-like ligands (Dll1/Dll4), can induce T cell lineage commitment in hematopoietic progenitors.
  • The specific role of thymic epithelial cells (TECs) in providing Notch signaling for T cell development in vivo remains unclear.

Purpose of the Study:

  • To investigate whether thymic Dll4 expression by TECs is indispensable for initiating Notch signaling and driving T cell development within the thymus.
  • To determine if Dll4-mediated Notch signaling is the primary mechanism by which the thymus supports T cell fate determination.

Main Methods:

  • Generated mice with a floxed Dll4 allele, enabling conditional gene deletion in TECs.
  • Assessed Dll4 expression in TECs and Notch intracellular domain 1 (ICN1) in hematopoietic cells in mutant mice.
  • Analyzed T cell populations (CD4, CD8, double-negative) and T cell progenitor presence in the thymus.
  • Restored T cell differentiation by enforcing ICN1 expression in hematopoietic progenitors in Dll4-deficient TEC settings.

Main Results:

  • Dll4 expression was successfully abrogated in TECs of mutant mice.
  • Hematopoietic cells in mutant mice showed significantly reduced levels of ICN1.
  • A complete absence of CD4+CD8+ double-positive and single-positive T cells, along with a lack of T cell progenitors, was observed in the thymus.
  • Forced expression of ICN1 rescued T cell differentiation, even when TECs lacked Dll4.

Conclusions:

  • Thymic epithelial cell-derived Dll4 is indispensable for inducing Notch signaling in immigrant hematopoietic progenitors.
  • This Dll4-Notch signaling axis is a critical thymus-specific requirement for initiating T cell development and differentiation.
  • The findings highlight the essential role of the thymic microenvironment, specifically TECs, in orchestrating T cell lineage commitment through Dll4-mediated Notch activation.