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Generation of Lymph Node-fat Pad Chimeras for the Study of Lymph Node Stromal Cell Origin
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Kit ligand and Il7 differentially regulate Peyer's patch and lymph node development.

Stéphane Chappaz1, Claudia Gärtner, Hans-Reimer Rodewald

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

Journal of Immunology (Baltimore, Md. : 1950)
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

Hematopoietic lymphoid tissue inducer (LTi) cells are crucial for lymph node and Peyer's patch development. Kit and Il7 signaling pathways differentially regulate these processes, with Kit being essential for Peyer's patch development and both acting synergistically for lymph node formation.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Signaling

Background:

  • Hematopoietic lymphoid tissue inducer (LTi) cells initiate lymph node (LN) and Peyer's patch (PP) development.
  • The specific growth factor signals governing LTi cell development and organogenesis are not fully understood.
  • LTi cells express Il7r and Kit, while organizer cells express their ligands.

Purpose of the Study:

  • To investigate the roles of Il7 and Kit signaling in LTi cell homeostasis.
  • To determine the significance of Il7 and Kit in LN and PP organogenesis.

Main Methods:

  • Analysis of mice deficient for Kit (Kit(W/Wv)), Il7 (Il7(-/-)), or both (Il7(-/-) Kit(W/Wv)).
  • Assessment of LTi cell numbers, organizer cell generation, and organ development in mutant mice.

Main Results:

  • Il7(-/-) Kit(W/Wv) mice lacked LTi cells, leading to absent LNs and blocked organizer cell generation.
  • Kit signaling, but not Il7, was critical for intestinal LTi cell numbers, PP organizer cell generation, and PP development.
  • PP organizer cells had higher Kitl and lower Il7 expression than LN organizer cells.

Conclusions:

  • Kit and Il7 synergistically promote LN organogenesis.
  • Kit signaling is essential for PP organogenesis and intestinal LTi cell homeostasis, independent of Il7.
  • Differential growth factor expression by organizer cells underlies the distinct regulatory mechanisms for PP and LN development.