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Inability to induce tolerance through direct antigen presentation.

Ingrid C Rulifson1, Gregory L Szot, Ed Palmer

  • 1UCSF Diabetes Center, University of California, San Francisco 94143-0540, USA.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
|July 18, 2002
PubMed
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CD4+ T cells drive allograft rejection. This study shows that donor skin Langerhans cells can initiate rejection without costimulatory blockade, suggesting targeted therapies for transplantation tolerance.

Area of Science:

  • Immunology
  • Transplantation Biology
  • Cellular Immunology

Background:

  • T cell-mediated allograft rejection involves direct and indirect antigen presentation pathways.
  • CD4+ T cells are crucial for rejecting various allografts.
  • Costimulatory pathway blockade (CD28/B7, CD154/CD40) can induce tolerance.

Purpose of the Study:

  • To investigate the requirement for T-cell costimulation in direct antigen presentation during allograft rejection.
  • To determine if direct antigen presentation necessitates costimulatory signals for T cell activation.

Main Methods:

  • Utilized T-cell receptor transgenic mice specific for class II major histocompatibility complex (MHC) antigens.
  • Analyzed the role of different antigen-presenting cell (APC) populations in costimulation.

Related Experiment Videos

  • Assessed allograft rejection in the context of costimulatory blockade.

    • Main Results:

    • Class II-specific alloreactive T cells mediated allograft rejection independently of costimulatory blockade.
    • Langerhans cells, resident in donor skin, are potent stimulators requiring no CD28 or CD154 costimulation for direct MHC antigen presentation.
    • This contrasts with findings for CD8+ T cells, suggesting pathway-specific roles for costimulation.

    Conclusions:

    • Direct antigen presentation by certain APCs, like Langerhans cells, can bypass the need for CD28/B7 or CD154/CD40 costimulation.
    • Costimulatory blockade's efficacy in transplantation may be specific to the indirect antigen presentation pathway.