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Related Experiment Videos

Antithymocyte globulins suppress dendritic cell function by multiple mechanisms.

Cord Naujokat1, Carsten Berges, Dominik Fuchs

  • 1Department of Transplantation Immunology, Institute of Immunology, University of Heidelberg, Heidelberg, Germany. cord.naujokat@med.uni-heidelberg.de

Transplantation
|February 24, 2007
PubMed
Summary

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Antithymocyte globulins (ATGs) impact dendritic cell (DC) function in transplantation. These therapies inhibit DC antigen uptake and T cell stimulation, revealing DCs as key targets for ATG immunosuppression.

Area of Science:

  • Immunology
  • Transplantation Science
  • Cell Biology

Background:

  • Polyclonal rabbit antithymocyte and anti-T-cell immunoglobulins (ATGs), including Thymoglobulin (TG) and ATG-Fresenius S (ATG-F), are crucial in preventing allograft rejection and graft-versus-host disease.
  • While ATG's effects on T cells are understood, their influence on dendritic cells (DCs) remains less clear.

Purpose of the Study:

  • To investigate the impact of TG and ATG-F on the immune functions and signaling pathways of human monocyte-derived DCs.
  • To elucidate the mechanisms by which ATGs affect DC behavior relevant to transplantation.

Main Methods:

  • Utilized flow cytometry, ELISA, Western blot, and apoptosis assays to assess DC immune functions.
  • Employed endocytosis and T cell stimulation assays to evaluate DC antigen uptake and T cell interaction capabilities.

Related Experiment Videos

  • Analyzed signaling pathways including MAPK and NF-kappaB activation.

    • Main Results:

    • TG and ATG-F bind to multiple surface molecules on DCs, including CD11c, CD80, CD86, and HLA-DR.
    • ATGs induce DC apoptosis and inhibit antigen uptake by binding C-type lectins (CD206, CD209).
    • ATGs activate ERK1/2 and p38 MAPK pathways, promote NF-kappaB translocation, suppress IL-12p70 production, and impair DC capacity to stimulate T cells.

    Conclusions:

    • ATGs significantly interfere with fundamental dendritic cell functions.
    • Dendritic cells are identified as relevant targets mediating the immunosuppressive effects of ATGs in transplantation contexts.