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Generation of Lymph Node-fat Pad Chimeras for the Study of Lymph Node Stromal Cell Origin
Published on: December 16, 2013
Ontogeny of stromal organizer cells during lymph node development
Cécile Bénézech1, Andrea White, Emma Mader
1School of Immunity and Infection, Institute for BioMedical Research-Medical Research Council Centre for Immune Regulation, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom.
Journal of Immunology (Baltimore, Md. : 1950)
|March 19, 2010
Summary
Early embryonic development of lymph nodes (LNs) involves mesenchymal precursor cells maturing into stromal cells. This process, crucial for lymphoid organ formation, is guided by specific cellular interactions and signaling pathways.
Area of Science:
- Developmental immunology
- Embryology
- Cell biology
Background:
- Lymphoid organ development, including lymph nodes (LNs), is a complex process involving interactions between lymphoid tissue inducer (LTi) cells and stromal cells.
- The precise initial events triggering lymph node anlagen formation before LTi-stromal cell crosstalk remain incompletely understood.
Purpose of the Study:
- To elucidate the early cellular and molecular mechanisms driving lymph node anlagen formation in embryonic development.
- To investigate the role of mesenchymal cells and their maturation in initiating lymph node development.
Main Methods:
- Utilized mouse embryos, focusing on inguinal and mesenteric lymph nodes (LNs).
- Employed techniques to track cell surface marker expression (ICAM-1, VCAM-1) during stromal cell maturation.
- Performed in vitro LN organ cultures with alphaLTbetaR agonist treatment.
- Analyzed gene expression profiles (Il-7, Cxcl13, Ccl21) in stromal cells.
Main Results:
- Inguinal LN anlagen originate from mesenchymal cells surrounding lymph sacs.
- Stromal cell maturation occurs in two steps: an initial LTi-independent phase (ICAM-1(int)VCAM-1(int)) followed by an LTi- and LTbetaR-dependent phase (ICAM-1(high)VCAM-1(high) expressing organizer cells).
- Absence of LTbetaR signaling blocked stromal maturation at the intermediate stage, impacting LN development.
Conclusions:
- Stromal cell maturation is a critical, multi-step process essential for lymph node formation.
- Early stromal cell maturation is independent of LTi cells and LTbetaR signaling, while later stages require these interactions.
- Understanding these inductive signals and cellular interactions is key to comprehending lymphoid tissue development.
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