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Lymph node fibroblastic reticular cells construct the stromal reticulum via contact with lymphocytes

Tomoya Katakai1, Takahiro Hara, Manabu Sugai

  • 1Center for Molecular Biology and Genetics, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan. tkatakai@virus.kyoto-u.ac.jp

The Journal of Experimental Medicine
|September 24, 2004
PubMed

Insights

Lymph node architecture relies on fibroblastic reticular cells (FRCs) forming a network. Lymphocyte signals trigger FRCs to create this essential meshwork, supporting immune cell interactions.

Area of Science:

  • Immunology
  • Cell Biology
  • Histology

Background:

  • The lymph node's intricate structure, crucial for immune responses, is maintained by fibroblastic reticular cells (FRCs) and extracellular matrix.
  • The mechanisms by which FRCs construct and modify this network upon lymphocyte activation remain unclear.

Purpose of the Study:

  • To investigate how fibroblastic reticular cells (FRCs) form and remodel the lymph node's reticular network.
  • To understand the role of FRCs in immune cell trafficking and interaction within the lymph node.

Main Methods:

  • Established specific FRC lines (ERTR7(+)gp38(+)VCAM-1(+)) for analysis.
  • Examined the production of the ER-TR7 antigen and its role in network formation.
  • Investigated the influence of chemokines and specific molecular signals (TNF-α, LTα, LTβR agonistic antibody, NF-κB pathway) on FRC behavior.

Main Results:

  • FRCs produce chemokines that promote T cell and dendritic cell migration and adhesion.
  • FRCs secrete the ER-TR7 antigen, contributing to the extracellular matrix meshwork.
  • Lymphocyte contact, along with specific inflammatory signals (TNF-α/LTα, LTβR activation), induces meshwork formation via the NF-κB pathway.

Conclusions:

  • Lymphocyte-derived signals are key in prompting FRCs to build the reticular network.
  • This FRC-generated network is vital for orchestrating immune cell movement and interactions within lymph nodes.
  • The study elucidates a mechanism for lymph node structural plasticity in response to immune activation.

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