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The preTCR-dependent DN3 to DP transition requires Notch signaling, is improved by CXCL12 signaling and is inhibited

Roxane Tussiwand1, Corinne Engdahl, Nadine Gehre

  • 1Developmental and Molecular Immunology, Department of Biomedicine, University of Basel, Basel, Switzerland.

European Journal of Immunology
|September 2, 2011
PubMed

Insights

T-cell development requires Notch signaling at the double-negative 3 (DN3) stage for differentiation into double-positive (DP) cells. This process is preTCR-α dependent and can be modulated by CXCL12 and IL-7.

Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Signaling

Background:

  • Notch signaling is crucial for T-cell development, but its precise requirements during specific developmental stages remain unclear.
  • The interplay between Notch signaling and other pathways during T-cell maturation needs further elucidation.

Purpose of the Study:

  • To investigate the specific requirements of Notch signaling for T-cell differentiation from double-negative 3 (DN3) to double-positive (DP) stages.
  • To explore the role of additional signaling pathways and factors in this process using a novel in vitro system.

Main Methods:

  • Development of a stromal-cell-free culture system for studying T-cell development.
  • Utilizing sorted DN3 thymocytes and inducing Notch signaling via Delta-like-4 (DLL4).
  • Assessing the impact of chemokines (CXCL12) and cytokines (IL-7) on proliferation and differentiation.

Main Results:

  • Sorted DN3 thymocytes require only DLL4-induced Notch signaling for differentiation into DP cells.
  • This differentiation is dependent on preTCR-α and involves 4-5 proliferation cycles.
  • CXCL12 enhances proliferation, while IL-7 inhibits differentiation by suppressing Rag-2 up-regulation.

Conclusions:

  • A simplified stromal-cell-free system effectively recapitulates key aspects of early T-cell development.
  • Notch signaling is essential for DN3 to DP transition, with preTCR-α playing a critical role.
  • The system offers a valuable tool for dissecting T-cell selection mechanisms.

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