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T-cell generation by lymph node resident progenitor cells.

Rafik Terra1, Isabelle Louis, Richard Le Blanc

  • 1Institute of Research in Immunology and Cancer, University of Montreal, QC, Canada.

Blood
|March 5, 2005
PubMed
Summary
This summary is machine-generated.

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Lymph nodes can support T-cell development if Wnt signals are provided to specific progenitors. Supplying Wnt transforms lymph nodes into primary T-lymphoid organs, revealing a cryptic T-cell development pathway.

Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • Two progenitor types, c-Kit(hi)IL-7Ralpha- and c-Kit(lo)IL-7Ralpha+, generate T-cells in the thymus.
  • c-Kit(lo)IL-7Ralpha+ progenitors are found in lymph nodes (LNs) but fail to mature.

Purpose of the Study:

  • To investigate the reasons for blocked T-cell development in LNs.
  • To identify factors that could enable extrathymic T-cell development.

Main Methods:

  • Analysis of progenitor cell cycle and gene expression in LNs.
  • Co-culture of LN progenitors with stromal cells.
  • In vivo administration of oncostatin M.
  • Assessment of Wnt signaling in LN stroma.

Main Results:

Related Experiment Videos

  • LN c-Kit(lo)IL-7Ralpha+ progenitors arrest in G1 phase due to altered gene expression.
  • These progenitors fail to develop into mature T-cells in LNs.
  • Wnt4 signaling or oncostatin M enables T-cell maturation from LN progenitors.
  • LN stroma lacks Wnt4 and Wnt7b transcripts.

Conclusions:

  • Wnt signaling is crucial for extrathymic T-cell development.
  • LNs can be converted into primary T-lymphoid organs by providing Wnt signals.
  • This study uncovers a cryptic T-cell development pathway and its potential amplification.