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Murine Model of CD40-activation of B cells
Published on: March 5, 2010
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Murine Fibroblastic Reticular Cells From Lymph Node Interact With CD4+ T Cells Through CD40-CD40L
Yumi Nakayama1, C Colin Brinkman, Jonathan S Bromberg
11 Center for Vascular and Inflammatory Diseases, University of Maryland, Baltimore, MD. 2 Departments of Surgery, University of Maryland, Baltimore, MD. 3 Microbiology and Immunology, University of Maryland, Baltimore, MD.
Transplantation
|April 10, 2015
Summary
Fibroblastic reticular cells (FRCs) interact with T cells via CD40-CD40L signaling, influencing immune responses. This bidirectional communication is key for tolerance induction in transplantation research.
Area of Science:
- Immunology
- Transplantation Biology
- Cellular Interactions
Background:
- Costimulatory blockade using anti-CD40L monoclonal antibody (mAb) and donor-specific splenocyte transfusion (DST) induces alloantigen-specific tolerance.
- Lymphotoxin signaling in fibroblastic reticular cells (FRCs) is crucial for lymph node function during tolerization.
- This study investigates the role of FRCs in modulating CD4(+) T cell interactions during DST and anti-CD40L mAb treatment.
Purpose of the Study:
- To elucidate the functional role of FRCs in the context of alloantigen-specific tolerance induction.
- To determine how DST and anti-CD40L mAb treatment affect FRC-T cell interactions.
- To investigate the involvement of the CD40-CD40L pathway in FRC-T cell communication.
Main Methods:
- Mice were subjected to immunization or tolerization protocols involving DST with or without anti-CD40L mAb.
- Fibroblastic reticular cells were isolated using flow cytometry at various time points.
- In vitro assays were performed to assess FRC proliferation and activation, as well as their impact on CD4(+) T cells.
Main Results:
- FRCs rapidly transcribed inflammatory mediators upon DST, an effect inhibited by anti-CD40L mAb.
- CD40 is expressed on FRCs; agonistic anti-CD40 mAb activated FRCs, promoting CD4(+) T cell proliferation.
- Anti-CD3 mAb-activated CD4(+) T cells induced inflammatory gene expression in FRCs, which was blocked by anti-CD40L mAb, indicating bidirectional CD40-CD40L signaling.
Conclusions:
- CD40-CD40L interactions between FRCs and CD4(+) T cells facilitate bidirectional communication, altering FRC gene expression of immune regulatory molecules.
- This FRC-T cell interaction pathway is a novel target for inducing tolerance in transplantation.
- Understanding these cellular interactions is critical for developing strategies to prevent transplant rejection.
